Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hi, my name is ***** ***** I will assist you. Unfortunately, the only way to know if the rear expansion valve is clogged is to check the valve visually. the rear system has no pressure ports and is annexed off from the rest of the system so you cannot monitor rear-specific pressures. To do this, as I'm sure you know, you would need to evacuate the system and then pull off the part (which is easier said than done with r12!). I would suggest ruling out the blend door operation first by changing the temperature from hot to cold in the rear and checking for any change at all...of course you won't feel COLD air, but if the blend door is working and the a/c is not then the temperature should at least change some. Let me know how this goes!
Ok, so it sounds like the blend door is moving in the rear, but the a/c is not working in the rear. I would suspect either a stopped up rear expansion valve or clogged evaporator. Good luck!
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I read that info differently...I didn't realize it was that far above ambient. In that case, I would try this first before you do anything else: go under the van to the rear evaporator lines where they go into the cab (should be right rear) and feel that one is getting cold and the other is staying hot. This will help determine if the a/c is working properly and you just have a blend door problem or if the a/c is inop. If they are cold and hot respectively, then you should have no problem at all diverting the air permanently over the evaporator in the rear.
two of the lines are for the heater core in the rear, and should be hot. The other two should have one cold and one hot if the a/c is working. It sounds like your rear a/c may not be working. But, to answer your question, I need to know what repair you are talking about...do you mean locking the blend door in the cool position?
Ok, so you are talking about looping the heater hoses in the rear together and bypassing the heater core all together...I'm on the same page now. No, that would not be a problem at all, provided it does not leak.