Rear AC Not Cooling

[nick956]

I know this isnt the correct forum section but the Express van area is dead compared to this side.

 

So I have problems with the rear ac on my express van 2004 with the rear ac not cooling but the front is frigid cold. I already replaced expansion valve and vacuum system and filled with new refrigerant. What can be the issue?

 

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[gmtech4]

I know this isnt the correct forum section but the Express van area is dead compared to this side.

So I have problems with the rear ac on my express van 2004 with the rear ac not cooling but the front is frigid cold. I already replaced expansion valve and vacuum system and filled with new refrigerant. What can be the issue?

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Have an HVAC tech scan the module and diagnose it , it burned you once , that's enough I would think

[nick956]

The thing is its an aftermarket one called Pro-Air and not gm delco brand so I dobt think its connected to computer would it?

 

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[gmtech4]

The thing is its an aftermarket one called Pro-Air and not gm delco brand so I dobt think its connected to computer would it?

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Idk , it's aftermarket crap !!!!!!

[txab]

Did you flush the system thoroughly to remove debris?

 

Atually best to tell us what all you did to the system.

[nick956]

Update: I actually read the Pro-Air manual for my system and it clearly gives a troubleshooting guide of what to replace and steps to do so. At the end, it ended up being the heater control valve under passenger seat outside and can only think it was staying stuck open and allowing hot coolant to pass thru rear evaporator as if heater was on thus not allowing cool air to flow at rear. Cheap fix @ only $13.64 at oreillys auto parts.

 

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