How to diagnose a Subaru that overheats after ten minutes of driving
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- čas přidán 29. 12. 2011
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How to diagnose a Subaru that overheats after ten minutes of driving
My new channel for my helicopters, skiing and hobby's is
czcams.com/users/THESkiVik... - Jak na to + styl
Nice - in the last 5 minutes I learned more about cars than I have from all my time working on cars. Cool and thanks for the info.
Brian, love you videos! This is the right way to check a thermostat. However I have to tell you that the spring is not Bi-Metal, it is just a spring. The capsule in the middle is filled with a fluid that expands and contracts at a certain temperature. This is what actuates the thermostat. The spring is what closes it. Keep up the good work!
Excellent advice. I'm a 74 year old senior citizen and I understood everything that you described and I can do this. Thank you bcuz I love my 2000 Outback AWS. I always view a CZcams before I take it to the mechanic.😉
This was the most helpful video, explanation, possibilities I could find! Thank you so much. I learned a ton in just that small time frame. Things no one has informed me of in a month of trying to figure out wtf is wrong with my car.😊
Brian, you are da bomb bro. Who knew that you could learn so much while being entertained at the same time? You are awesome. Even the simplest of devices are intriguing when you explain them. Peace brother!
You are a good "explainer", Brian. Thanks.
Just got a 06 sti and it just temporarilly gets hot from 192-207. No leaking of rad fluid. Only when it's 100+ outside. Gonna try and "burp" and fill correctly, hardwire fans and then do the mishimoto therm and wrap my header... Dang corn fed big turboed subie. Thanks for showing me this
Thank you Brian for posting on youtube, your advice saved me from buying an engine. Thank you,thank you, thank you!
This one helped me repair the grandson's wife Subi, head gasket malfunction. Thank you very much.
Saved me once again! your videos do nothing but help! Thank you!
Hey! I appreciate the video! I needed to know this! I got white smoke out of my hood. Never the back end. Now I am facing replacing an engine- even though I got it serviced before it blew. Keep posting! My suby is driving me nuts!!!
Man, you are a trooper!
Thanks for the info. My car is overheating and I started to panic. Changed the oil (was well overdue), and found a loss of coolant. the only symptom that would match a blown head-gasket was the overheating. I figured that the Pressurized reservoir cap is a bust, or I accidentally introduced air in the coolant system the last time I saw it empty/ near empty, or there is a leaking hose somewhere I haven't seen yet. No visible leaks anywhere, and no coolant found during the oil change. I'm changing out the reservoir caps out for a new one. I'm also doing a super flush, and a proper burping, on the coolant system tomorrow morning.
Wish me luck!
How'd it go?
Hi thanks very much for this. I drilled a few holes in my thermostat flange and that really help. Car no longer overheat. Still have to check coolant daily to ensure coolant not get blown out too much from the system as the HG's still leaking.
One very important thing on a Subaru is to ALWAYS use an OEM thermostat when replacing it, the aftermarket ones are a different design and can cause elevated temperatures and other issues. Also, just to add, symptoms of head gasket failure on the older DOHC engines is bubbles in the coolant reservoir from combustion gases (you can also run air into the cylinder in a leak down to check for bubbles) as these ones had internal leaks. The newer SOHC engines had external leaks.
I truly enjoyed learning about thermostats thank you. well done!
dude your a genius and help me out more then you know thanks bro
Hi Brian. Thank you very much for these most helpful videos. You're awesome! I've never bothered to work on my cars in the past but am now learning to do a few minor jobs myself. You have a great way of explaining things. Your videos rock! Cheers :)
This is the best video I’ve seen, thanks for your help and information. Made perfect sense.
Very helpful video! I had my whole coolant system inspected and radiator replaced and still experiencing overheating. Thermostat is hopefully the cause!
dude your awsom ty for all you're help we love the way you explain everiting
Brian , my 98 subi e20 would be dead without your , amazing ,guidance, it has 375 klm's , still going strong ,!st model of Forrester in Australia , Thanks my friend ,
Not sure if you realized just how much information,good and important information you actually spit in this video..ALOT. I literally took down some notes from things you said in this video..thank you.
Dude, you're the best. This video helped me out immensely.
Hey man, your videos are immense. Thanks heaps.
Good stuff. Appreciate your videos, there definitely unique and I mean that in a good way.
It’s funny when you said people are cooking a turkey around this time. Im watching this on 11/26/20 😂😂 happy thanks giving!!
Many good tips here. I'm new to the Subaru "boxer" engine. Thanks for the post.
Just wanted to thank you for your video, & helping me out !
@odewepe 195-198 is PERFECT! At 220 F gaskets and seals start going melt face.
Thanks Brian, once again you help us to remember the lil'things that sometimes in the complexidy of a job, we can forget or overlook these things. As far as the other topic. In my opinion(
Thanks man! I learned lots from tis video!
You are my new favorite youtube guy!
Dude you are a genius. Very helpful.
hey Brian I know this is an old video but, I have a question regarding how to fill your system with coolant on these flat engines, since I'm about to change the oil cooler o ring and a new T stat. should I fill the radiator first and then keep pouring coolant on the top tank to fill the whole system and just bleed it out for a few minutes?
Hey Brian Thanks Man i really appreciate the guidance!! :-)
Sweeeeet freestyle to the WKRP vocal melody!
Question: If I had a possible bad thermostat and had to drive about 300 miles to get home to change it, first, is that possible? If so, how would I do so safely without overheating or causing damage to my engine?
I have 2 Subaru Legacy's. Both have given me the same overheating problem at various times. The solution is ridiculously simple. Air gets trapped in the heater element, which sits under the dashboard and is higher than the radiator so that the air does not bleed out. There is no independent thermostat bypass in a Subaru. The hot water flowing through the heater element re-joins the main cooling system at the thermostat and acts as the thermostat bypass, heating up the thermostat so that it can open. The thermostat is at the bottom of the engine and receives cool water coming back from the radiator which causes it to close unless the bypass coming via the heater is flowing properly to keep the thermostat hot. So if you have an airlock in the heater element your car will overheat because the thermostat is not getting hot water to open it. This tends to occur more at low revs, like when driving in traffic. If you rev the engine this often pushes more coolant through the heater and opens the thermostat and suddenly the engine cools down again.
The way to prove this is to bypass the heater element. Get or make a u-bend of 16mm metal pipe and disconnect the two heater hoses at the firewall behind the engine and join them together with the u-bend and two hose clamps. The overheating problem will go away for good. But of course, now you have no heater. The best solution if you want your heater to work is to cut both the heater hoses at a suitable spot next to each other and to fit a T-piece in each hose and join them together. (See photos). Then water can bypass the heater element keeping the thermostat functioning properly and enough hot water will still flow through the heater element to warm up the car's interior. This is the best solution, because every time you have work done on the cooling system, air gets in and it is almost impossible to get it out of the heater element again. You then get erratic overheating problems when you least expect them, and the symptoms mimic a blown head gasket, with water being blown out of the radiator and the expansion tank overflowing. Alternatively one can try to clear the airlock from the heater element by disconnecting the left heater hose and back flushing the element with a garden hose, then quickly reattaching the hose while trying not to let air in. But the above solution with the two T-pieces to bypass the heater element has worked better for me and provides a permanent solution, and getting air out of the cooling system after any future repairs will not be a problem
again.
I used a straight piece of hose to join across the T-pieces in the one car, and I used a U-shaped piece of hose in the other car. The U shape allows one to get away with not getting the T-pieces perfectly aligned, but can be hard to obtain. However a spare of the U-shaped rubber bypass hose that attaches the metal bypass hose to the thermostat housing is the right shape and diameter.
see photos here: - www.cargurus.com/Cars/Discussion-t17159_ds614293
I bought my impreza with your configuration and thought that somebody in the workshop was falling asleep. I rejoined the hose as it were supposed to be and suddenly the car overheats like nobody's business. Now I understood why the coolant hose was bend and sent back to where it came from. Gosh, talk about poor design from Subaru...
I just jack the front of the car or put it oon car ramps. This way the the radiator cap will be higher than the heater exchanger thus allowing the air to escape. Good luck with the subarust.
I'm having all the symptoms that you describe, than you for sharing!
Anthony van Tonder THANK YOU!
Wow, I thought my 1999 Subaru Legacy was the only one who had that problem. No internet back then, no suggestions from mechanics either. It happened on a trip, the shop didn't have a thermostat available oh, so we just left it out. I forgot about that, drove another 60000 miles without one. Didn't have any problems at all. Heated well and cooled well. Crazy huh?
It's been a long time since you made this video so you probably already know what I'm fixing to say it's very simple to find out if you have a faulty thermostat in your Subaru 2.5 as you already know the thermostat is on the bottom of the engine .Start your car ,let it get hot, cut the car off, check your top radiator hose if it's hot check the bottom radiator hose it will be cold this shows that the water is not circulating and the thermostat is not working correctly.Also the little jiggle valve on the thermostat should be pointing at the radiator not the block. Thank you for your video
Wouldn't a dead water pump produce the same symptoms?
Very helpful video! Thank you.
I changed out my thermostat and it seems like there in no fluid going into the line. My heat is not there and the outlet on top is hot. Do i have a clog somewhere? I did find cloth like material when i removed cap. Last owner used radiator stop leak I think?
if took my 1995 subaru legacy to a garage,for overheating (temp gage goes to H after about 5-10 min + cold air only coming out of interior heater)can you tell me what I should expect for cost for replacement of thermastat vs head gasket failure. I really enjoyed your video as I know nothing about this and was able to get a fair idea how the heating system works.
forgot to mention the interior air is quite cold-feels like a/c is on
thank you
Thank you so much for your help!!! Great video!!!!!
I've been told that the combustion gas problem can be temporarily dealt with by drilling three small holes similar to the vent you showed because if that vent isn't sufficient or twisted to the wrong clock position gasses will still collect
hi, my GC8 WRX GT ver 5 coolant leaks when im driving rough or when i rev high.. i sent to workshop and they removed my thermostat. it was ok but after a month the coolant leaks again..i couldn't fine where the leaks came from..all of the hoses looking fine and no damage..coolant leaking from below..not from the radiator hose or radiator coolant tank but below the coolant tank..
I have a 2008 subaru impreza basic model and i replaced thermostat, water pump, timing belt, pulleys, belts, upper lower hoses, radiator, bypass hose and i bled the coolant. Afterwards my coolant levels seemed low, and i would have to top it off every 2-3 days. Just wondering if i can get any help of what it might be. any answer or opinion is appreciated. thanks
I have a 2005 legacy non turbo and I love it.
The right head was replaced 2000 miles ago with a felpro head gasket and a new head. Here we are again with the coolant pushing from radiator to the overflow tank. Do you think I'll have to have the head surfaced Or just replace the gasket? I've also heard to use 6 star head gaskets. Do you use these? I've heard they are very good.
Hi Brian, I've got a 2001 2.5 RS and received a P0128 code that indicates coolant temperature below thermostat regulating temperature. Should a new thermostat take care of this?
Hahaha that intro was funny man! Good job
My 2008 Subaru outback 2.5 L H4 is not wanting to accelerate and then over heating can you tell me any ideas of what might be wrong with it.
Hi thanks for your videos, I just made a video of my 97' Outback having some cooling issues. Would you mind taking a look at it and giving me your input? I dont want to change the head gasket unless i really have to. Thanks again
Lots of great tips. I have one for you, check out "Uview Airlift" and you will never have a hard time getting all the air out,sure beats trying to use the bleeder valve. As for peak oil,
syncrude up in Alberta has more oil reserves untouched than all the middle east. Great Vids Brian,well done!!
Really appreciate this video and explaining done. My Tribeca keeps over heating we changed the radiator, fan and thermostat. But it keeps doing it. Last time we ran it without the Thermostat and it wasnt over heating. Is that a sign that its probably the head gaskets?
@Bonfield2002 Good to know- thanks for sharing the wisdom!
Thanks man, everything you said makes perfect sense... =( Unfortunately for me. I do indeed have a leaking head gasket on my 2002 Impreza 2.5 RS, and EVERY fall or winter I have these issues with overheating when I try to use my heat. Within a week of using heat I start getting issues with overheating. But it was fine all spring and summer bc I didn't use the heat... usually I replace the T-stat and its fine for awhile. But this time I barely lasted a month after my last T-stat replace... Don't know what to do i cant afford the $2000 they want for a gasket replacement... Oh well, keep posting wisdom my friend!
Brian if the thermostat was tested and works, the bottom radiator hose is icy cold and the top hose is hot. I swapped out the thermostat and it still is the same result. Could this be a water pump issue?
Brian, How about leaving the factory thermostat out, and using an aftermarket inline hose thermostat, installed in the upper hose. Wouldn't that allow a good burp, eliminating the problem? Thanks for great videos. Example: JEGS 53260K1 In-Line Thermostat Housing Kit
Haha this is awesome. Thanks
got a problem,i have a 2003 subaru outbback,replaced the head gaskets,thermostat,water pump,radiator,hoses,and it continues to over heat,the coolant builds up in resavoir tank and does not return to radiator.i am at my wits end,any suggestions (other than junk it as my friends say)
Appreciate the video and info sir 👍👌🏿
Usually that type of system is related to the ignition control module getting hot and there not being enough white heat conductive paste on it anymore so it burns up and cuts out when too much heat accumulates.
how to tell if you overheating gauge work fine, i got manifold leak on both side and all the engine bay get super hot, hose everything, i can't even touch by hand the upper radiator hose without getting hurt.both shield cover was fall to rust, but gauge is telling me everything is fine, i do have a check engine steady and a cruise control blinkingthis was like that before and after the coolant flush i did, and after a drive if i check the manifold i see smoke coming out of it
@easydoz1 Keep an eye on that. If a fan dies and stops it can do that and then free up again.
Hey man. Not sure when you will see this but I have an 02 subaru forester, just bought it a couple weeks ago. Its constantly overheating. Ive changed the thermostat twice an checked both of them an they both worked. Yes I burped it an made sure all bubbles were done coming out. But the subaru keeps over heating. I am unsure if its a blown head gasket or a bad water pump. I do not have any leaks or white smoke coming from the tail pipe or the engine bay. The car will run fine but if i drive it just down the road (5min or so) it will start to overheat again. When I just have the car sitting and running for 30min or more it's fine, it wont over heat at all. Just a bit perpexled. I've thought maybe its the radiator but it doesn't show any signs of damage or leaking either. I also took the thermostat off completely an hooked the hose back up an the freaking car will drive fine and wont over heat at all. So i'm assuming the water pump is fine also. Not sure how else to diagnose this issue to figure out what exactly is going on with the car. Would love to hear your thoughts on this. Thank you in advance!
Thank you for the video. What is your thoughts on FelPro MLS head gaskets? My 01 OB had bad head gaskets at 95k miles. I put in felpro MLS and sold to my manager who took care of it as his commuter car the last 6 years. (Very ocd) anyway he bought a new 19 OB and sold me the old one now with 150k miles on it. But since I’ve had it, about every month i get air in the system and purg it then it’s fine. I know it’s going to be time again because I can hear air and water in the heater core when I start it up. Wrong gaskets? Maybe it Needs head gaskets again or he let if unknowingly overheat...System has no leaks and oil and coolant very clean. Is it possible for the coolant system to suck air from somewhere? Thank you and I’ll let you know if it’s something crazy I find as the cause. 😂 lol
Nice video . Keep it up .
Peace from malaysia
Love the music in the intro i hope you don’t get copyrighted
I have a 97 legacy L wagon, and a few weeks ago I followed your channel because the car was overheating I replaced the thermostat. It's been running good since. Until today it overheated again so I popped the hood and there was no radiator cap, so I found and put it back on, but it kept overheating. I filled with water, and replaced the cap. It's not overheating, but the needle is just above the center mark on the meter.
I am not a mechanic, and glad to have found you.
What do you suggest is next for me to do with my car?
@beefystik Thanks. I'm glad to make videos as long as I know people like you like them.
@odewepe Is the water pump impeller rusted away? If not it's time for a compression gasses check at the radiator filler neck.
hello i have 1998 subaru forester when i go on low revs the temp.shoots up close to red but when i step on the gas and on high revs the temp drops to normal ?any help will be appreciated thank you...
Worst case scenario: cracked cylinder wall on #4. Ever seen that before? Now I have. Thought it would be a standard head gasket job and then...GAME OVER lol
Did it leak coolant when your cylinder cracked? My 06 wrx just started leaking coolant from under the engine
Hi Brian,
My subbie is acting up a bit, when cruising on the freeway temp goes up to 208 and hovers around 205.
When car is not moving and idling goes to 205 and then fans kick in temp goes down.
Lately tho, fan kicks in stays at 200, turn the heater on and temp drops slowly...... Could this be a sign of bad thermostat? Or is it head gasket?
Thanks in advance
My 2002 subaru legacy 2.5 began overheating a year ago.Did the head gaskets.Still overheating,at least the temp gaige says so.The mechanic says it's a faulty gauge and wants me to get another instrument cluster.I say,when he pulled the motor out,he didn't get all the air out and he put a thermostat in that is deliberately stuck open.I want to put the right thermostat in the right way but don't know how,and I'm done with that mechanic.Is there a certain position for the thermostat to be placed so air won't get trapped?
whats the ideal engine temperature? and how hot the radiator pipe to be considered as overheat?
Hi Brian, Can find this answer on google so Im hoping you can help. My 03 pathfinder overflows the overflow tank when Im towing a trailer with 2,500 pounds. I have towed 2k without a problem. I drive it daily with no issues. Cant figure it out! It is rated to tow 5k and the temperature needle is always reading normal. Any idea? Please?
Mine 2008 Subaru Impreza has the same overheating problem + coolant leaking. The inter cooler is ok and changed the thermostat but still haven’t figured out what it could be cuz recently 15k km ago water pump was also changed. Help me please
Hey i tried all these and turned out i had a split heater core in my dash and it was only after squeezing the radiator pipe was the coolant that was leaking visible the other give away was the carpet was always wet i thought it may have been because of the front vent leaking but after disconnecting the heater core it stopped overheating
Classic head gasket failure symptoms. Do a compression gasses test at the coolant tank while it's bubbling. If the fluid goes from blue to yellow it's a head gasket. The combustion gasses collect around the thermostat and it stays closed. you can drill four to six holes in the thermostat plate to let the gasses through for a temporary fix to get by.
How you know is the had gasket is not good. My car subaru forests 2006 and the antifreeze going from radiator to resevour
Thank you Brian
I have a weird issue with my legacy GT where I only start to overheat when climbing a hill for over 5 minutes. Fans work, never overheat in flat surfaces, only when going uphill for an extended amount of time.
I've got a 2000 legacy outback,
I've changed the thermostat, put new spark plugs, changed oil and filter, and top off engine coolant, and it's still over heating, It doesn't show any signs that the head gasket is bad but when I was putting coolant in it, the radiator kinda geysered. Heaters and defroster don't work so I think I need a new heater core but I don't think that has anything to do with the overheating. My engine fans work as well fyi. Anyone have any thoughts? Have not tried the burping thing yet, but will soon.
Thank you very much!
This is very rare but I proved to myself that a free floating water pump impeller was causing the over-heating problem. Take out the thermostat, from under the car look at the impeller with a flashlight, try to spin the impeller with some type of prying tool. I was spinning the crankshaft while feeling the impeller movement. At first it seemed to be turning properly; but after a few tries it became obvious the impeller was free floating. That's tricky. After the pump is re[placed, I hope my engine will stay cool and the cabin heater will warm me.
Hey Brian I'm currently working on my 2003 Subaru legacy wagon with an overheating problem. I've changed the radiator, coolant temp sensor,PCV valve ,and it still gets hot after 20 mins of driving. Do I change my thermostat next? Not a mechanic but learning fast because of your videos. Can't part with the car help
So I am thinking it is air in the system or may have faulty bad factory thermostat and leaning towards just replacing it and drilling an extra hole to bleed the air?
I have checked for oil in the the radiator and did an extra oil change to check for antifreeze mixed in with the oil and it is all clear?
I have Hayes manual and in the trouble shooting section they also indicate that it could be a bad water pump or a block radiator core. What are your thoughts on this?
@odewepe How is the radiator on it? Is it full of cat hair, corrosion, stop leak?
Thermostats work via that little brass cylinder in the center , it's a "wax motor" , it contains a small brass pellet, as the temperature around it goes up, it expands, working like a hydraulic cylinder to move the valve against the spring. Cut an old one open and examine it. As far as "peak oil" goes, I've read articles from people in the petroleum industry that say over 90% of the oil is still in the earth.
Hey Brian, your videos are awesome! My 97 legacy GT is leaking oil right onto the cross member, I don't think it's my head gasket, any ideas? I hope it's not the rear main, or separator plate.
Thank you so much for the video. Is there a video where you talk about the coolant pushing into the overflow tank and pushing out the tube that goes into the radiator neck? If there is not evidence of coolant in the oil, no leaks other than from the overflow tank and no some, what should I check? It is an 03 Outback with 260K, headgaskets were replaced at about 190K or so.
+Platinum Distributing NE having the same problem with my 02 wrx. Hoping to get an update.
I have the same problem with my 2010 outback. Replaced the radiator, thermostat, and water pump. Still overheating after 12 miles of driving.
Great videos! I've been trying to help a friend of mine with a forester a small dealer pawned off to him. Overheating ever since. I've personally never had one. Helped him flush fluids, change thermostat, etc. He has a family of 6 broke can't afford a mechanic so tried using liquid glass, head gasket sealer... I know, but just trying to get him by, 5 mile daily drives. Then I saw your videos. So I know it's temp fix as well but what size drill bit? and where should we drill? Thank you
My suburu is overheating after a few minutes of driving, i checked the therm and it works fine. Im not sure if it is a head gasket problem, because i figured if that were it it would have to burn off enough coolant to make it overheat, and it getting hot after just a couple miles when the radiator is full. So my question is do you think it could be a clogged up radiator?
So good!!!
Test it while it's out. If it's good drill three small holes equally spaced in the main plate of the thermostat where the bleeder hole and brass bobble are.
Depends on how long you let it cool down. You can drive up to 5minutes when the engine is cold in most cars with no coolant at all and be OK.
can anyone tell me wat wrong with my 06 sti. I recently scraped the bottom of it. I thought I damaged the oil pan bit it seems fine. I did the oil change nothing leaked. it has all fluids top off. and the tempature Guage goes slightly up then goes down any ideas
Hey Brian, how about to test the radiator cap, I'm suspicious about the cap is letting the pressure escape, any suggestions?
i think is too late but happy thanks giving bro. thanks for the video
Hey i have a subaru legacy 97 2.5 gt i started it up this.morning and let it heat up n when i go in the car the heat was warm n gauge was good then i drove two blocks n the temp gauge went all the way up n the heat turned cold it only overheats when its driven when its running in the driveway it is fine n heat is hot. . . Im thinking it is the thermastat any ideas?