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Warm air - and I don't understand why

yellow_submarine on Fri June 05, 2009 9:22 PM User is offline

Year: 1986
Make: Audi
Model: Coupe GT
Engine Size: 2.2
Refrigerant Type: R-134a
Ambient Temp: 85
Pressure Low: 25-30
Pressure High: 200-250
Country of Origin: United States

I removed the old AC system and installed a Seltec compressor, parallel flow condenser, barrier hoses, and new receiver/drier. I removed and flushed the exaporater, but did not replace it or the expansion valve. I am using R-134, car was originally designed for R-12.

At 85 degrees ambient, the coldest I can get out of the vents is about 57-58. The fan in front of the condenser was on, and I had a large fan in front of the car blowing into the condenser too.

I am thinking I should be much colder, but that's the best it does. The new condenser is slightly smaller than the old one, but I mounted an electric fan in front to help offset that.

Any ideas? I thought it might be the expansion valve but after reading here it sounds like there is not much difference between a R-12 and a R-134 valve.

TRB on Fri June 05, 2009 11:05 PM User is offlineView users profile

Pressures look OK, euro cars are not know for having large evap cores! You might just be maxing out the BTU of the core. Did it cool better when using R12?

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yellow_submarine on Sun June 07, 2009 2:43 PM User is offline

Wasn't sure how it worked with R-12, the condenser fittings were broken off when I bought it.

I re-wired the radiator fan to come on with the compressor, so now I have that fan sucking and the condenser fan blowing. Before, the condenser fan was just blowing. With that modification, temps dropped 20 degrees.

Thank you for your help.

TRB on Sun June 07, 2009 2:58 PM User is offlineView users profile

Good air flow is always a must. But your original listed pressures did not show a sign of a high pressure issue. What are the pressures now after rewiring the fan?

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Dougflas on Sun June 07, 2009 3:35 PM User is offline

Clamp off the heater hoses to see if a reheat is causing a problem.

yellow_submarine on Sun June 07, 2009 5:47 PM User is offline

The heater core is/was cold, so that wasn't the problem. There was some warm air blowing in from the condensation drain (I had removed the pan) but I took care of that.

Pressures now are 25-30 low, 150 high, 75 degree ambient, 36 degree evap temp.

TRB on Sun June 07, 2009 7:19 PM User is offlineView users profile

Extremely odd your low side has not dropped yet you high side has dropped 100 psi. Glad it is working for you now!

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

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