The doors on the heater portion of the air box have foam seals that deteriorate over time, and leave an air gap that allows hot air to mix with the cold A/C air, warming in to less than optimal temperatures.
What about in the summer time bypassing the heater core with either some kind of on/off valve or just pulling the heater core hoses and connecting them together so the hot coolant just recirculates back? If a guy were to do the on/off valve, you of course would put it on the hose taking the coolant TO the heater core, but how does a fella determine which one that is?
Add a fan on the front side of the evaporator and turn it on with a switch when your sitting or in stop and go traffic and you will see a HUGE temp drop in your ac. Your clutch fan alone doesnt draw in enough air at low idle @ op temp. The gmt800's are colder because they have electric fans that are computer controled. Time for you to do a 411 swap
I found this GM 15-8686 Auxiliary Engine Cooling Fan Assembly on the AC Delco website. It is compatible with the GMT 400. I’ve seen a couple reviews that mentioned it helped cool down the AC too. I’m going to definitely consider adding it
@@user-hm2pz8ro9v if I do a video, it will be sometime until I make it since I haven’t bought any parts. However, I’ll share with you some of the parts I’ve researched and I found that is compatible. So this auxiliary fan Im mentioning fits in front of the AC condenser and was found on 1 ton/Dooley gmt 400’s. I’ve seen some people reviews that mentioned it helped improve the AC getting colder on the same GMT 400 & 800. GM 15-8686 Aux fan & its corresponding ACDelco GM PT723 Dorman version 621-300 A/C Fan I’m also going to be using the gmt 400 1 ton power steering pump cooler Dorman 918-303
Had the same hesitation problem, I changed maf, tps, iac, and nothing. I removed throttle body and thoroughly cleaned it and replaced the gasket and it made a huge difference. I guess the butterfly was getting stuck. Only takes about a hour
That's what I have, the MPFI update www.summitracing.com/parts/smp-fj504?seid=srese1&gclid=Cj0KCQjwlMaGBhD3ARIsAPvWd6jzfGJmW3d8iG1fppt6HCn6y5xCNlou5gXGzmqgaivMhYqh-vl87zUaAhc4EALw_wcB
That engine you have to remove and throughly clean the throttle body and clean the ICV port as well. I clean MAF twice a year and a new Wix air filter and fuel filter every year. Yes I changed mine to the Standard MFI and made a huge difference 99 Burb K2500. But those have always had a slow response hesitation at take off
AC just never worked well on these trucks. My 98 grom new if it was hot just never cooled down ext cab well. Tryed all kinds of parts and seen many others same way in the GM shop
Have you upgraded the spider injection to multi port fuel injection? Mine had a hesitation till i upgraded that. I have a 97 SWB Z71 with the 5.7. She's got 270k on the clock
Nice vid. I've been watching your vids for a while. I enjoy the mod installs. I have a 97 long bed Z71 and it's my baby. It runs great and everything works. I am just in need of a new paint job. My trucks paint is very faded and I've tried to bring it back up to glossy but it to far gone. Anyway, just wanted to say I am trying very to bring the outside appearance back to glossy and beautiful. It's really hard to find a "reasonable" priced paint shop that will do a quality job. Looking forward for the next vid.
@@BADZ71 in order for you truck to not hesitate when you give it gas is becuz it’s your vortec box it gasp for air you can cap it off with a 3 or a 3 1/2 ruber seal it’s a fast throttle response I’m running it
Surprised yours was that clean! Mine had all kinds of leaves, twigs, and such behind the blower motor. Didn’t really help my situation. Probably since I have a crew cab though, more area to cool.
I did this on my 98 (posted a short vid on it) and he's showing it correctly. That is the side that collects debris, his was just really clean. You can get your hand in there (barely) and I pulled out a handful of gunk, soaked it with simple green they hosed it out. Noticable improvement.
Great video my a.c. will blow nice and cold when it's charged my compresser leaks out but when its full its good but if you over fill it they don't work good either maybe you have a littke yo much in the system i hope the idel control helps i just did my rear O2 sensors kept popping up on the scanner
Is this a video about your AC or your idle issue ? I spent 17 mins of my life watching this to learn you had a clean air box and evaporator plus your fan is ok. So I’m confused did I miss something that improved your AC or does this need a title change ?
For the hesitation, I’ve asked many mechanics about the hesitation and loss of power on my 98 and they said it just comes with age. I’m sure you plan on a full engine rebuild and or swap. Maybe don’t put anymore money or time I’m fixing problems till the swap
Hey man nice vid definitely gonna try to clean mine out and see if it blows cooler air or blows better but I was wondering what is that dash command app how do I get that lol
Have you tried the ect sensor my truck was doing some of your symptoms and i was told to replace that and it works great now. I never had a check engine light on either
You probably dont want to here this. You can do anything to make it blow like it did factory but it wont work. The problem is the flap seals in the hvac box. I just replaced a door and the seals, bad news the dash and seats have to come out, its quite a pain. Mine were all laying in dry rotted pieces in bottom of box. Fyi if you do it, i went ahead and changed heater/ac components and actuators. Worth it just dont get in a hurry. Mine is a 1998 z71 silverado. Good luck
My 1995 Chevy K1500 stepside does the same thing when it’s raining hard outside! I usually just take that passenger mat out and let the truck air out.. I mean I do expect my truck not to be perfect since it’s 25 years old & has 300,000 plus miles on it🤣 You have a really nice truck man, checkout my channel and let me know what you think of my!
Nice try, I've been checking multiple CZcams videos and most pertain to actuators and other reasons. You are more of just replacing things until something works, this video is not helpful at all when it comes to cooling issues. At least you're getting a lot of hits and making some money off CZcams, good for you.
Actuators go bad to, in my case I didnt have a bad actuator back when I did this video. There are multiple different reasons for cooling issues out there. Thanks for commenting.
The doors on the heater portion of the air box have foam seals that deteriorate over time, and leave an air gap that allows hot air to mix with the cold A/C air, warming in to less than optimal temperatures.
What about in the summer time bypassing the heater core with either some kind of on/off valve or just pulling the heater core hoses and connecting them together so the hot coolant just recirculates back? If a guy were to do the on/off valve, you of course would put it on the hose taking the coolant TO the heater core, but how does a fella determine which one that is?
Add a fan on the front side of the evaporator and turn it on with a switch when your sitting or in stop and go traffic and you will see a HUGE temp drop in your ac. Your clutch fan alone doesnt draw in enough air at low idle @ op temp. The gmt800's are colder because they have electric fans that are computer controled. Time for you to do a 411 swap
What’s an 411 swap sir? I dealing with the same problem
You mean the front side of the condenser? I was having this same thought. My AC blow cold while driving but cool when at a stop. I live in TX BTW.....
I found this GM 15-8686 Auxiliary Engine Cooling Fan Assembly on the AC Delco website. It is compatible with the GMT 400.
I’ve seen a couple reviews that mentioned it helped cool down the AC too. I’m going to definitely consider adding it
@@ndeeeedcould you do a video on it bro?
@@user-hm2pz8ro9v if I do a video, it will be sometime until I make it since I haven’t bought any parts. However, I’ll share with you some of the parts I’ve researched and I found that is compatible.
So this auxiliary fan Im mentioning fits in front of the AC condenser and was found on 1 ton/Dooley gmt 400’s. I’ve seen some people reviews that mentioned it helped improve the AC getting colder on the same GMT 400 & 800.
GM 15-8686 Aux fan & its corresponding ACDelco GM PT723
Dorman version 621-300 A/C Fan
I’m also going to be using the gmt 400 1 ton power steering pump cooler Dorman 918-303
A/c issue vid becomes ias vid. 😡
Had the same hesitation problem, I changed maf, tps, iac, and nothing. I removed throttle body and thoroughly cleaned it and replaced the gasket and it made a huge difference. I guess the butterfly was getting stuck. Only takes about a hour
I'll try that thank you!
I changed mine from central injection to multiport and it took care of hesitation. You can get new updated injection for around 350-400
That's what I have, the MPFI update
www.summitracing.com/parts/smp-fj504?seid=srese1&gclid=Cj0KCQjwlMaGBhD3ARIsAPvWd6jzfGJmW3d8iG1fppt6HCn6y5xCNlou5gXGzmqgaivMhYqh-vl87zUaAhc4EALw_wcB
Yep, cleaning the carbon build up in the TB fixed my high idle issues.
That engine you have to remove and throughly clean the throttle body and clean the ICV port as well. I clean MAF twice a year and a new Wix air filter and fuel filter every year. Yes I changed mine to the Standard MFI and made a huge difference 99 Burb K2500. But those have always had a slow response hesitation at take off
AC just never worked well on these trucks. My 98 grom new if it was hot just never cooled down ext cab well. Tryed all kinds of parts and seen many others same way in the GM shop
Electric fans.
I love your mirrors. Those are sweet.
Have you upgraded the spider injection to multi port fuel injection? Mine had a hesitation till i upgraded that. I have a 97 SWB Z71 with the 5.7. She's got 270k on the clock
Nice vid. I've been watching your vids for a while. I enjoy the mod installs. I have a 97 long bed Z71 and it's my baby. It runs great and everything works. I am just in need of a new paint job. My trucks paint is very faded and I've tried to bring it back up to glossy but it to far gone. Anyway, just wanted to say I am trying very to bring the outside appearance back to glossy and beautiful. It's really hard to find a "reasonable" priced paint shop that will do a quality job. Looking forward for the next vid.
Please let me know where you got your fender flares I've been hunting for some on my 1997 gmc k1500 stepside,yours look great
Me too. Find any?
Check your gasket all gasket.. Mine was the spider injector gaskets
Id look at computer and its program for drivability issues.
Have you tried cleaning the MAF sensor. It seems mine needs to be cleaned almost every oil change. There is a cleaner spray for it.
I'll give it a shot, or maybe even try my other sensor.
@@BADZ71 in order for you truck to not hesitate when you give it gas is becuz it’s your vortec box it gasp for air you can cap it off with a 3 or a 3 1/2 ruber seal it’s a fast throttle response I’m running it
@@BADZ71 you can get one at Home Depot for $6
Surprised yours was that clean! Mine had all kinds of leaves, twigs, and such behind the blower motor. Didn’t really help my situation. Probably since I have a crew cab though, more area to cool.
Tint will help
If you had a water pump replaced its possible not blocking off. Or it's the mode doors
Does your positive battery cable get hot . Because my truck had the poor throttle response.fix the cable and the problem went away.
Not that I know of. I'll check it out though
I’ve also replaced everything and it’s just weak man, my air flow is also weak. Did you ever figure out anything.
Did you look at the OTHER side of the evaporator? Seems that debris would be on the OUTSIDE!
I did this on my 98 (posted a short vid on it) and he's showing it correctly. That is the side that collects debris, his was just really clean. You can get your hand in there (barely) and I pulled out a handful of gunk, soaked it with simple green they hosed it out. Noticable improvement.
Hey I'm new here love the truck and thanks for the information because I have the same problem with my truck
Thanks for stopping in!
Great video my a.c. will blow nice and cold when it's charged my compresser leaks out but when its full its good but if you over fill it they don't work good either maybe you have a littke yo much in the system i hope the idel control helps i just did my rear O2 sensors kept popping up on the scanner
98 yukon has the same problem. All new AC components but does not blow nearly as good as it should.
Maybe it's just an OBS thing lol
BADZ71 nice truck haven't see that truck in a while I seem like I wonder why tho because of corona virus
Mass air flow sensor
carpet fibers and dog hair is what was in mine . these act as insulators .
Is this a video about your AC or your idle issue ? I spent 17 mins of my life watching this to learn you had a clean air box and evaporator plus your fan is ok. So I’m confused did I miss something that improved your AC or does this need a title change ?
It's a video about whatever I wanted it to be about at the time, since I'm the content creator. Thanks for watching.
For the hesitation, I’ve asked many mechanics about the hesitation and loss of power on my 98 and they said it just comes with age. I’m sure you plan on a full engine rebuild and or swap. Maybe don’t put anymore money or time I’m fixing problems till the swap
It comes with age? Wow.
Hahahaha that's funny sounds like a sakes pitch to sell u a new motor
Hey man nice vid definitely gonna try to clean mine out and see if it blows cooler air or blows better but I was wondering what is that dash command app how do I get that lol
Dude where did you get those headlights….!!!
Ever find out why you were getting water on the passenger floor? I have the same issue.
I never did, it still happens when I wash it. Common OBS issue I think
Did you ever find the leak in the floorboard?
Have you tried the ect sensor my truck was doing some of your symptoms and i was told to replace that and it works great now. I never had a check engine light on either
I've changed it before, chances are it could be bad again or faulty. Just ordered a new AC Delco part.
Did you ever relearn your cam pos sensor! Just do it & stop chasing your tail!
What kind of scan tool is that.
Check cap and rotor mine fails every year no idea why im going to try removing the vent screens on distributor at some point
Mine was doing the same thing and I replaced the weather strip under the hood along the firewall and it fixed it!
My 98 yukon has the same problem still can't fix it, its 100 degrees out here in cali 🤦♂️
Whew That's a little hot, I'm still dealing with the same issue lol
You probably dont want to here this. You can do anything to make it blow like it did factory but it wont work. The problem is the flap seals in the hvac box. I just replaced a door and the seals, bad news the dash and seats have to come out, its quite a pain. Mine were all laying in dry rotted pieces in bottom of box. Fyi if you do it, i went ahead and changed heater/ac components and actuators. Worth it just dont get in a hurry. Mine is a 1998 z71 silverado. Good luck
Biggest waste of time.
Whats the app your using at the end?its connected to your truck??
Dashcommand with an OBD2 Bluetooth Reader
Where did you get the led lights in your interior?
I just buy them off Amazon, usually have good luck with them
My 1995 Chevy K1500 stepside does the same thing when it’s raining hard outside! I usually just take that passenger mat out and let the truck air out.. I mean I do expect my truck not to be perfect since it’s 25 years old & has 300,000 plus miles on it🤣 You have a really nice truck man, checkout my channel and let me know what you think of my!
Subscribed
Thank you 🙏
not not clean bro your getting water in with that hole in the vent lmao
Nice try, I've been checking multiple CZcams videos and most pertain to actuators and other reasons. You are more of just replacing things until something works, this video is not helpful at all when it comes to cooling issues. At least you're getting a lot of hits and making some money off CZcams, good for you.
Actuators go bad to, in my case I didnt have a bad actuator back when I did this video. There are multiple different reasons for cooling issues out there. Thanks for commenting.