I’m in Florida and it gets hot in this state. I have a flatbed trailer. With the car on it, 5000lbs. All together 11270lbs. Just traded a 2017 f150 king ranch 5.0 for a 2017 f150 fx4 platinum max tow and so far so good
Ford has a new thermostat part number for the eco boost 3.5. It has a plastic guide rod that prevents binding. The original gets stuck and doesn’t allow coolant flow to the oil cooler. HL3Z - 8575 - B Thermostat HL3Z - 8255 - A O-Ring
@@joequint I’m going to try the SPD performance thermostat instead of the factory. I wasn’t able to find the part number for the old. I don’t want to risk the same problem. This one is designed for tuned engines and has a 170 degree change in it. SPD PERFORMANCE 170 DEGREE THERMOSTAT (GEN 2) TS17035R
Ford dealer changed two engine for me first 41k same problem overheat again secon engine change overheat again after $17633 I have same problem took truck back to dealer again and waiting to solve my overheat problem
@@cilgingaddar yeah, I could see that. Have them contact ford field engineering or read my post. Check the link. I don’t have any issues and I’m pulling more weight up mountains :)
The BIGGEST issue is the oil temperature.. ford has a stock sandwhich coolant adapter on the block that your oil filter screws into.. the oil heats up the coolant that cokes out of return side of radiator back to above operating temps.. and back into the engine.. best way to solve this is to install a universal air cooled oil cooler with a thermostatic plate adapter that open ls to the oil cooler @ 195-200°, keeping that cooler oil in the loop helps keep engine temps down and coolant temps as well... ford only does this to help preheat oil on cold start...it literally does nothing for hauling...engineering flaw
Interesting and makes sense. On the forums guys mention this. Do you have any videos of this from a numbers perspective? I thought about doing the oil cooler to prevent the heat soak race condition but that seems to happens pretty infrequently if I’m running 91 and keeping my speed under 72
@@joequint i do not have the video proof.. but i will upload something soon!. I just made this modification to my 2014 3.5, and left the stock coolant sandwich adapter for stop and go traffic conditions.. considering the elec fans will kick on @200°f +/- to help cool the oil but the thermostatic sandwich adapter also engaging the thermostat i have installed to open at 200° circulating the external cooler.. only it will not cool as fast in a idle state vs. In motion allowing ram air from air dams to cool the oil cooler.. ford does not have a oil temp sensor soo essentially via SCT BDS, i have monitored "coolant" temps under heavy load or heavy acceleration under 200° at all times... reasoning being is i wanted the oil to get up to operating temp to help boil off any H2O or fuel contaminants or oil distillilates that will only break down the oil viscosity and molecules so my PCV system can pull those vapors into my catch can and still condense.. this mod will only benefit 100% since these trucks need fresh clean cool oil to lubricate the turbos and timing system..it essentially keeps everything cool but not too cool.. perfect peak performance imo
@@anthony8787 heck under 200 you are well into the green zone. 250+ oil is the no good zone. These engines are bad to the bone and with frequent oil changes it should be all good. If you are towing heavy 10k+ in mountain in the southwest, oil coolers do help. Outside of that prolly overkill IMHO. I infrequently tow and as you saw in the video it had no issues. Or maybe that was another video.
Thank you SO MUCH- I have a 18 expedition max that would go up to 243 when turbo engaged at high mph- go back to midline after slowing down. Ford dealer stonewallled me last year and said these engines were designed to “run hotter”. BS! How much do the dealer charge for all that you did- i assume it’s not under warranty?
@@sfcjerryharris1 2018 Lariat 3.5 High Output. I recently towed across Colorado and Utah on 70 and had to keep it dialed down on speed due to getting too hot. It was upper 90s to 100.
@Joe Quint, what was the fix? It sounded like you replaced the thermostat? I'm having the exact same issue on my '17 3.5 Ecoboost here in the CO front range.
Sorry I thought I had in this video too. Resolution/Fix My first step was to replace the air filter and spark plugs and radiator degas cap. Oddly that helped reduce the temperature spikes. Next I cleaned the 3 MAP sensors. There are plenty of videos I looked at this one MAP sensor cleaning Mine were covered in oil but that didn't seem to have any affect but it seemed like a smart thing to do. THIS RESOLVED THE ISSUE: Ford Service Engineers said that there is a known issue with the thermostats sticking or not fully opening. (this was new to me. I thought thermostats only failed open or closed). The dealership replaced the thermostat and did a full system flush to ensure there are no debris or air bubbles. BOTH STEPS ARE NEEDED. For me, I believe this is the major issue in that others that are experiencing as well as being seeing so many posts. Others have stumbled upon this by replacing multiple parts like the water pump and radiator which are not needed (unless leaking or bearing issues). I hope this fixes your vehicle. While the fix was not all that difficult, these motors are very complicated and do alot of compensating resulting in very odd behavior. Keep up with your maintenance that is your best shot at keeping the vehicle running properly. Even though I do, I am seeing that shortened service intervals are needed if we frequently tow heavy.
If you are towing and getting a spike in temp due to high ambient temperatures like 90+ and not locking out that just mean you are heat soaking the system. I tow at 3k + RPM. If you are seeing over temp just driving empty do the above stuff.
@@desutley ahh, I’m in KS. It was Shawnee Mission Ford. The Denver dealer can call them up and ask what they did to my truck if needed. It was a long ordeal.
@@joequint Hey thanks! I've been trying to get my dealer to try something else but since they can't reproduce the issue and can't tow test it they're saying nothing is wrong. I couldn't climb I70 over 35 mph yesterday without it overheating.
The engine can get heat soaked that is for sure. When it’s 90+, I keep my Rpm above 3000 to move enough coolant and exhaust flow to prevent issues. Works for me :) I’m not sure why the smart engine programming doesn’t change the Trans shifting to compensate for this situation. Seems like a straightforward fix
I’m in Florida and it gets hot in this state. I have a flatbed trailer. With the car on it, 5000lbs. All together 11270lbs. Just traded a 2017 f150 king ranch 5.0 for a 2017 f150 fx4 platinum max tow and so far so good
Ford has a new thermostat part number for the eco boost 3.5. It has a plastic guide rod that prevents binding. The original gets stuck and doesn’t allow coolant flow to the oil cooler.
HL3Z - 8575 - B Thermostat
HL3Z - 8255 - A O-Ring
Well John you just solved the caper with direct evidence. I just knew it was suspect. Too bad I couldn’t get some $$$ back from ford on my repair :(
@@joequint I’m going to try the SPD performance thermostat instead of the factory. I wasn’t able to find the part number for the old. I don’t want to risk the same problem. This one is designed for tuned engines and has a 170 degree change in it.
SPD PERFORMANCE 170 DEGREE THERMOSTAT (GEN 2) TS17035R
@@thejalderman yeah, it’s not needed once the new part gets put in. I have had zero trouble with it. No need to worry about
Late, but fyi correction:
O ring is part # BR3Z-8255-A
@@upshifter5316Not according to Ford parts. The truck in the video is a 2018 ecoboost. The HL3Z is the correct part number.
Ford dealer changed two engine for me first 41k same problem overheat again secon engine change overheat again after $17633 I have same problem took truck back to dealer again and waiting to solve my overheat problem
@@cilgingaddar yeah, I could see that. Have them contact ford field engineering or read my post. Check the link. I don’t have any issues and I’m pulling more weight up mountains :)
The BIGGEST issue is the oil temperature.. ford has a stock sandwhich coolant adapter on the block that your oil filter screws into.. the oil heats up the coolant that cokes out of return side of radiator back to above operating temps.. and back into the engine.. best way to solve this is to install a universal air cooled oil cooler with a thermostatic plate adapter that open ls to the oil cooler @ 195-200°, keeping that cooler oil in the loop helps keep engine temps down and coolant temps as well... ford only does this to help preheat oil on cold start...it literally does nothing for hauling...engineering flaw
Interesting and makes sense. On the forums guys mention this. Do you have any videos of this from a numbers perspective? I thought about doing the oil cooler to prevent the heat soak race condition but that seems to happens pretty infrequently if I’m running 91 and keeping my speed under 72
@@joequint i do not have the video proof.. but i will upload something soon!. I just made this modification to my 2014 3.5, and left the stock coolant sandwich adapter for stop and go traffic conditions.. considering the elec fans will kick on @200°f +/- to help cool the oil but the thermostatic sandwich adapter also engaging the thermostat i have installed to open at 200° circulating the external cooler.. only it will not cool as fast in a idle state vs. In motion allowing ram air from air dams to cool the oil cooler.. ford does not have a oil temp sensor soo essentially via SCT BDS, i have monitored "coolant" temps under heavy load or heavy acceleration under 200° at all times... reasoning being is i wanted the oil to get up to operating temp to help boil off any H2O or fuel contaminants or oil distillilates that will only break down the oil viscosity and molecules so my PCV system can pull those vapors into my catch can and still condense.. this mod will only benefit 100% since these trucks need fresh clean cool oil to lubricate the turbos and timing system..it essentially keeps everything cool but not too cool.. perfect peak performance imo
@@anthony8787 heck under 200 you are well into the green zone. 250+ oil is the no good zone. These engines are bad to the bone and with frequent oil changes it should be all good. If you are towing heavy 10k+ in mountain in the southwest, oil coolers do help. Outside of that prolly overkill IMHO. I infrequently tow and as you saw in the video it had no issues. Or maybe that was another video.
@@joequint i concur, i do run a mpt 93prx tune also as well as tow tune.. engine does run alot hotter especially when i tow
I never have any issues hauling with my 17 ecoboost. I would say it pulls 6000-8000lbs weekly during race season.
Thank you SO MUCH- I have a 18 expedition max that would go up to 243 when turbo engaged at high mph- go back to midline after slowing down. Ford dealer stonewallled me last year and said these engines were designed to “run hotter”. BS! How much do the dealer charge for all that you did- i assume it’s not under warranty?
Around $500-600 prior to inflation
Gave update on other video- dealer replaced thermostat at no charge and problem went away
What year, trim, 4x4?
@@sfcjerryharris1 2018 Lariat 3.5 High Output. I recently towed across Colorado and Utah on 70 and had to keep it dialed down on speed due to getting too hot. It was upper 90s to 100.
@Joe Quint, what was the fix? It sounded like you replaced the thermostat? I'm having the exact same issue on my '17 3.5 Ecoboost here in the CO front range.
Sorry I thought I had in this video too.
Resolution/Fix
My first step was to replace the air filter and spark plugs and radiator degas cap. Oddly that helped reduce the temperature spikes.
Next I cleaned the 3 MAP sensors. There are plenty of videos I looked at this one MAP sensor cleaning Mine were covered in oil but that didn't seem to have any affect but it seemed like a smart thing to do.
THIS RESOLVED THE ISSUE: Ford Service Engineers said that there is a known issue with the thermostats sticking or not fully opening. (this was new to me. I thought thermostats only failed open or closed). The dealership replaced the thermostat and did a full system flush to ensure there are no debris or air bubbles. BOTH STEPS ARE NEEDED. For me, I believe this is the major issue in that others that are experiencing as well as being seeing so many posts. Others have stumbled upon this by replacing multiple parts like the water pump and radiator which are not needed (unless leaking or bearing issues).
I hope this fixes your vehicle. While the fix was not all that difficult, these motors are very complicated and do alot of compensating resulting in very odd behavior. Keep up with your maintenance that is your best shot at keeping the vehicle running properly. Even though I do, I am seeing that shortened service intervals are needed if we frequently tow heavy.
If you are towing and getting a spike in temp due to high ambient temperatures like 90+ and not locking out that just mean you are heat soaking the system. I tow at 3k + RPM. If you are seeing over temp just driving empty do the above stuff.
@@joequint What dealership took care of the thermostat replacement? I'm hoping it's one in the front range and plan to take my truck there.
@@desutley ahh, I’m in KS. It was Shawnee Mission Ford. The Denver dealer can call them up and ask what they did to my truck if needed. It was a long ordeal.
@@joequint Hey thanks! I've been trying to get my dealer to try something else but since they can't reproduce the issue and can't tow test it they're saying nothing is wrong. I couldn't climb I70 over 35 mph yesterday without it overheating.
So what temp of the thermostat did you use ?
I use the stock thermostat. It works fine. No reason to change that.
It's a completely different issue when it's over 90 out. Thermostat doesn't cut it usually
The engine can get heat soaked that is for sure. When it’s 90+, I keep my Rpm above 3000 to move enough coolant and exhaust flow to prevent issues. Works for me :) I’m not sure why the smart engine programming doesn’t change the Trans shifting to compensate for this situation. Seems like a straightforward fix