Question about 1998 GMC Suburban

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1998 gmc suburban ac blows cold in rear but not front

Had the ac checked at a shade tree mechanic he showed me that there was enough freon in it and had a hard time explaining why this problem existed, as i stated it blows ice cold in the rear and luke warm up front i spoke to a regular ac mechanic and he seemed to think that there was a actuater valve somewhere under the dash that controls the door on the heater core and that valve is vacumn actuated and the that there is a vacumn leak somewhere or the valve has gone bad. if this is the problem how much for the part, and is it feasible for me to do it or pay this guy to do it

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I have the exact same issue did you ever solve it?

Posted on Jun 04, 2014

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No its a bit difficult,another problem could be venturi/restrictor in the entrance to the interior rad for the AC ,if the back one is working then so should the front one ,your man is right it could be a trampilla ,sorry forgot the word in english ,been living in spain too long but this is the vacumn operated valve ,could have a split vac pipe as well that operates the trampilla

Posted on Sep 11, 2009

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1 Answer

I HAVE EXHAUSTED MY SAVINGS ON TRYING TO FIX MY A/C - CAN SOMEONE IN THE SOUTHEAST MA OR RHODE ISLAND AREA HELP ME


If someone said the freon is leaking out, then you have a leak that needs to be repaired. Every connection in an AC system has a seal. AC systems work under very high pressures. When a seal goes bad, all the freon in the world will not stay in.
They sell kits with all the seals just for this purpose. I'm in AZ, so I can't help you. Plus, I'm working on the AC system in my wife's car right now. What you need is a reputable shop that can do the work for you. The whole system needs to be gone through. It will cost money to get it done correctly. And you should have a professional do it, not some shade tree mechanic. Good luck. I know what east coast summers are like.
Sorry I don't have a better answer.

Jul 05, 2014 | 1998 GMC Envoy

1 Answer

My gmc yukon 2000 slt rear ac blows hot air when i have ac . on and the front works fine .


I have a 2000 GMC Savana Van SLT with front and rear AC/Heat. My front would blow hot while the rear blew cold with AC on. It turned out to be low on Freon. It's hard to know if you have the right amount of freon installed because pressures vary depending on the ambient temperatures. So the best way is to remove all the freon then reinstall the recommended amount as listed on the evaporator housing near the firewall. This worked fine for me... works like new after installing the correct amount of freon.

Jul 01, 2014 | 2000 GMC Sierra

1 Answer

Front a/c blows cold air but back is blowing hot air


Could be low on freon, a faulty expansion valve on the rear system, or other issues. Can you tell if the rear ac lines are hot and cold ?

Aug 04, 2012 | 2001 GMC Yukon

2 Answers

What's your problem?I have a 1996 Chevrolet Suburban. The AC is blowing out hot air. I have had the truck for 6 years, every Summer its the same thing. The ac does not get cold, I take it to the m


To clarify - - if the truck has rear and heat, you have two heater cores and two evaporator cores. The evap cores carry the freon.
If the leak is in the evap core in the front, the price is probably right.

Jul 06, 2012 | 1999 Chevrolet Suburban

1 Answer

1997 gmc rear air conditioner is blowing hot


Could be a blockage in the lines to the rear unit.
Might be low on freon too. Or a blend door problem.
Can you check under the floor and see if one of the lines is cold ?

Jul 04, 2012 | 1998 GMC Suburban

1 Answer

How can I determine if my compressor is out on my


If you still get cold air out of the rear vents but the front only blows hot air you may have a bad temp door actuator in the dash, it may be stuck on hot and not able to move to cold air. However if you are low on freon with a truck that has front and rear ac then there will be a temp diff between the two. If it is hot air out the front like the heat is on then you have that actuator problem but if it is cool air about the same as the outside air temp then you may be low on freon.

May 23, 2010 | 2004 GMC Yukon

1 Answer

The rear a/c on my 1996 gmc suburban is blowing hot air, the front blows cold. where is the heater control valve for the rear heater core? i have taken the panels off of the condenser and the ducts for the...


the problem is in the rear expansion valve. this valve is located at the rear evaporator core. i am assuming the freon level has been checked and is ok. this is a common problem with these vehicles. hope this helps!!

Sep 04, 2009 | 1996 GMC Suburban

1 Answer

Rear AC is ICE cold but front blows Warmer air


a plugged orifice will prevent the front from becoming cold

Sep 01, 2009 | 1999 Chevrolet Suburban

2 Answers

I have a 2004 GMC Yukon with auto climate control. The front a/c is working but the fan will not come on. The rear a/s works fine. Checked fuses, they are all good. Any suggestions?


It's most likely your blower motor control module. Easy fix! Remove the kick plate under the glove compartment and the module is right next to your blower motor - remove the two screws and it will drop right out. Disconnect the wire harness (2 wires) and replace. Good luck!

Jul 28, 2009 | 2003 GMC Yukon

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