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Condenser Airflow

72PMD on Mon June 23, 2008 1:46 PM User is offline

Year: 1972
Make: Pontiac
Model: Firebird
Engine Size: 400
Refrigerant Type: R12
Ambient Temp: 95
Pressure Low: 50
Pressure High: 250
Country of Origin: United States

When first started, a/c system works great. Low side @ 1500 rpm drops to 30, high 210. As system warms up, pressures rise slowly to 50/250, evap temp rising accordingly from 40deg to 60deg. Lowering the hood raises high side about 20. Cold water sprayed on condenser drops high to 130, low side to low 30s. The problem doesn't seem to relate to coolant temp, more to engine compartment or condenser temp. I have owned this car since 86, a/c has always been marginal at best. This is a stock system, with new Delco parts (POA, TXV, reciever, reman. Delco compressor, etc). These parts have been replaced a number of times through the years. System was flushed, vacuumed for 24hrs & filled with 3 1/4 lbs r-12 by a shop last fall. Stock 7 blade fan with new thermo clutch. Stock rad. shroud. New condenser & evaporator. Thanks for any suggestions or advice. Kevin

Dougflas on Mon June 23, 2008 2:35 PM User is offline

You have found your problem...poor condenser action. You're not exchanging the heat from the refrigerant. You might try to use a cleaner on the condenser. It is possible that bugs and dirt have embedded themselves in the condenser. Try placing a 20inch box fan in front of the grill. see if the pressures drop to normal.

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