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97 Tahoe A/c Blowing Warm/cold


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9 replies to this topic

#1 leboyd

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Posted 31 July 2007 - 09:14 PM

My 97 tahoe is blowing cold air, then warm. I purchased freon, but the gauge on the filler showed it was full.

As I am driving at highway speeds it blows cold air for a longer time than wam air, but still seems to blow the warm.

If it's not the freon, would it most likely be the compressor or the pressure regulator? Or is there another possibility that I'm missing?

Thanks,

#2 ZZ327

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Posted 01 August 2007 - 08:25 PM

open the hood and run it, Does the compressor stay on a long time with the AC switch and Fan on?

what are your running pressures?

Edited by ZZ327, 01 August 2007 - 08:26 PM.


#3 vgodenwa

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Posted 02 August 2007 - 02:47 AM

My 97 tahoe is blowing cold air, then warm. I purchased freon, but the gauge on the filler showed it was full.

As I am driving at highway speeds it blows cold air for a longer time than wam air, but still seems to blow the warm.

If it's not the freon, would it most likely be the compressor or the pressure regulator? Or is there another possibility that I'm missing?

Thanks,


Don't know if they are the same, but my 2001 did this and it was the cycling switch.
Replaced it and no problems.
Von

#4 LT5Mike

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Posted 02 August 2007 - 08:51 AM

I've always been told that the first place to check out is low pressure switch (I'm assuming thats the same thing as mentioned below). It's located on the dryer up by the firewall and can be checked simply by taping it. If your computer kicks back on when you tap on it, then likely as not the switch has gone bad. They are about $12 or so at any auto parts store and can be changed in about 5 minutes.

Also..a while back I had a similar problem and when I took it to the shop they did something I thought rather odd. The technician explained to me that sometimes the gap between the compressor clutch and the compressor will become farther and farther apart. He didn't really explain how, but the problem with this is the magnetic force is not strong enough to engage the clutch, and often times it will cause your AC to quit on you.

He removed the clutch and ground it down a little bit. He then reattached it and tightened everything up, and I haven't had a problem since.

cYa
Mychael
1994 Silverado RCSB 4.3L
2012 Jetta TDI


#5 LT5Mike

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Posted 02 August 2007 - 08:51 AM

I've always been told that the first place to check out is low pressure switch (I'm assuming thats the same thing as mentioned below). It's located on the dryer up by the firewall and can be checked simply by taping it. If your computer kicks back on when you tap on it, then likely as not the switch has gone bad. They are about $12 or so at any auto parts store and can be changed in about 5 minutes.

Also..a while back I had a similar problem and when I took it to the shop they did something I thought rather odd. The technician explained to me that sometimes the gap between the compressor clutch and the compressor will become farther and farther apart. He didn't really explain how, but the problem with this is the magnetic force is not strong enough to engage the clutch, and often times it will cause your AC to quit on you.

He removed the clutch and ground it down a little bit. He then reattached it and tightened everything up, and I haven't had a problem since.

cYa
Mychael
1994 Silverado RCSB 4.3L
2012 Jetta TDI


#6 leboyd

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Posted 03 August 2007 - 10:25 AM

Thanks for all the ideas. I'll probably just replace the switch (since it's cheap) tomorrow and I'll let everyone know what the outcome is.

#7 leboyd

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Posted 04 August 2007 - 04:37 PM

Changed the pressure cycling switch. Can tell if it made a difference yet because I haven't driven enough, but it doesn't seem hopeful.

The compressor does seem to be fulling engaged.

I'll try to check the freon level again and see if its low know.

#8 skytop

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Posted 05 August 2007 - 10:54 AM

My brand new '07 Sierra Denali does the exact same thing! Cold then warm/stagnant air and then cold and then warm. This is no fun during the 95+ degree temperatures we are now having.

Dealer states that the high performance air conditioning system needs a periodic 'resting period' and it is within normal operating parameters for the vehicle.

I don't believe a word my dealer says anymore. They LIE and disrespect the customer. This truck is problem plagued and GM service is useless. Yes, I am disgusted by the miserable treatment and lack of solutions GM is providing.

#9 bpj280

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Posted 05 August 2007 - 04:06 PM

What temp would you say it is reaching inside the truck when it starts blowing warm air.

#10 leboyd

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Posted 08 August 2007 - 07:31 AM

Well, yesterday was +95 degrees with a heat index of 107. I drive home into the sun, so the sun works to keep the truck hot.

Throughout the trip, the a/c blew cold air. So, I would say the low pressure cycling switch was the problem.

Thanks for the help guys.




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