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both my camrys do this, at idle, the rings on the pistons are worn out and at a slow speed they dont pump as they should, but increase speed and the freon doesnt have enough time to slip past the rings and it starts cooling, another thing i have seen is he expansion valve is stuck open and at slow speed it isnt enough restriction to the freon flow. And to top the mess off the condenser on these cars is not very efficient, they need alot of airflow to work especially when you put 134a in it, be sure its clean with straight fins and the fans work. I kinda fixed my 5speed car, its still r12 and all i did was turn the white knob on the AC bypass valve on the intake manifold till it was around 1k at idle when the compressor came on, this mostly fixed it, but it has almost 300k miles on it, now the auto car is another story, it has 134a and it sucks, r12 cooled much better, i increased the compressor on idle and foam sealed the condensor to the radiator, works great until you put it in drive, and you better have your foot on the brake because if its in drive and the compressor comes on and you got it set for a 1k idle its going to go
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