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Help on factory a/c system on 67 chevelle

67SS396 on Mon July 20, 2009 5:50 PM User is offline

Year: 1967
Make: Chevy
Model: Chevelle SS
Engine Size: 396
Refrigerant Type: Freeze 12

I did a frame off on my car and have replaced everything on the A?C system including the POA valve. I bought the last one that my A/c guy had in 2005. I have been reading all the posts here to get info on my problem. Here it is I cannot get the air out of the vents to blow no colder than 60 degrees and most at idle around 70. I have freeze 12 in the system and have charged it with 3.75 lbs of freon. My guages were reading 32-35 on low side and around 225-250 high side at 1500 RPMS . It is 95-98 degrees here in Texas.

I have been reading about the adjustment on the POA valve so I checked mine and it is reading 30. I was gonna try and adjust it to 26 but I did not see an adjustment screw. Is the 7/32 screw in the outlet side of the valve towards the compressor? Any help will be greatly appreciated.

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bohica2xo on Tue July 21, 2009 2:44 AM User is offline

Last time I looked, R12 is still available in TX. Charge the system with R12 and you should be good to go.

B.

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"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

NickD on Tue July 21, 2009 6:01 AM User is offline

Freeze12 is not R-12, it's 85% R-134a and you have to use an R-134a compatible dryer and oil. You are not the first to post this. If you used NOS components, may also have a mess on your hands, kind of like filling your gas tank with diesel fuel.

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