Question about 1994 GMC Suburban

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Rear A/C Not getting Cool

Hello I am having some diff figuring this out. I have a 1994 Checvy 4x4 Sub with front and rear Air. the rear air is not cooling and I have put Freon in it at the front by the accumilator and the rear isnt getting anycooler. is there a T.X.V Valve or Piston or something I can check my self??
to see if or even why the freon may not be getting to the Back its almost like it is on Fan only butthe front is Cooling its *** off. Thank you for helping me

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  • Swent Aug 21, 2008

    okThanks I am the proud owner of a A/C Company and have been doing them for around 20 yrs but not to many Cars etc. but I can design and install a new one for your building. just didnt know if it had a T.X.V. Valve and if it was in the Rear I see a panel back there on the pass side I will attemp to remove it and check this out thanks very Much Mr.Dawson Hope I can fix it if not its going to a Shop. if you have one send me a E-Mail with Phone and or address. Thanks again



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The first thing that you will need to know is if the system is charged(with freon) to the proper level. The reason for this is if the system is not completely charged, then the rear a/c will be the first not to work properly. The next thing you need to do is follow the a/c lines all the way to the rear of the vehicle. You may need to remove one of the rear interior panels for the next step. Here you will need to follow the A/c line to a little box or valve, this is called an expansion valve. The expansion valve is actually what sprays the freon into the evaporator, and creates the cold. If the line in between the valve and the evaporator os not cold, then you will need to replace the expansion valve. To do this you will need to remove the freon before you replace the valve. This is a common problem, because the valve contains a small screen that will stop up with trash and will restrick freon from flowing into the evaporator. Let me know if you need any further help.

I’m happy to assist further over the phone at

Posted on Aug 21, 2008


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