Automotive Air Conditioning Information Forum (Archives)

fred murry 1 on Sat July 17, 2010 9:46 PM

Year: 1979
Make: pont
Model: Trans Am
Engine Size: 403
Refrigerant Type: R12
Ambient Temp: 95
Pressure Low: 38
Pressure High: 52
Country of Origin: United States

I replaced my dryer and o tube today because the temp at my vents was only 70D so after I pumped it down and started to recharge I noticed on my second pound that the high side reading was not coming up it was at 52 so I decided to try one more pound to see if it would come on up but after three cans of R12 it was still at H52 and L38 do you think I need a new compressor,by the way after new o tube and dryer and one hour pump down the temp at the vents was still the same 70D

bohica2xo on Sun July 18, 2010 3:03 AM

Not enough refrigerant in it yet. You have 3, 12 ounce cans in it - not even 3 pounds. Check the sticker on the radiator support. Should be 48 to 52 ounces - is this an A6 or R4 compressor?

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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.

fred murry 1 on Sun July 18, 2010 8:25 AM

It is a a6 but with three pounds it should be higher than 52 it should be around 100?

bohica2xo on Sun July 18, 2010 12:30 PM

There is no chart for a partially charged system. With a 25f delta across the evaporator and a partial charge, who knows what the high side should be.

Get the full charge in it so you can evaluate the system.

B.

-------------------------
"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.

fred murry 1 on Sun July 18, 2010 4:20 PM

10-4 thanks