Question about Pontiac Firebird

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I have a 94 firebird with a v-6 automatic. The a.c. works great when your driving through town, but when you get up to about 70 mph, the air gets warm again. What would the problem be, and how would I fix it ?

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Strange one this i would have expected it to be the other way around ,but without putting my machine on it and testing the compressor output its difficult to diagnose ,i am assuming that as this is a 94 vehicle then its using R134 gas which means it has a big AC radiator in front of the engine rad ,Now i would suggest that you go to a garage with a AC machine and let them empty the system to how see how much gas was in the system to start with as i suspect that the weight of gas is low which means that when the engine RPM is higher the gas isnt circulating quick enough ,its the liquid gas you need not just gas pressure.Another cause could be a slipping drive clutch at higher rpm as the pressure builds up its causing the drive clutch to slip,these are not that expensive or difficut to fit to a qualified mechanic .Either way i would advise you to seek help from a specialist garage for AC ,i think the most likely cause is the slipping clutch but it could be the lack of gas as well though .

Posted on Jul 07, 2010


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