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Porsche 944 AC Question

thill944 on Thu August 27, 2009 9:38 AM User is offline

Year: 1987
Make: Porsche
Model: 944
Engine Size: 2.5
Refrigerant Type: 134
Ambient Temp: 85
Pressure Low: 40
Pressure High: 210
Country of Origin: United States

Took the readings last night, engine running, AC on. High Side 210, Low side 40. Does not cool. Temp setting set at coldest. Temp coming out of vents is 75 degrees. AC compressor is turning, getting condensation dripping on garage floor, vents work fine as far as directional (foot/face). Put 12 ounces of 134 in. Still no difference in cooling.

robs on Thu August 27, 2009 10:30 AM User is offlineView users profile

What all did you do to convert the vehicle to 134a?

thill944 on Thu August 27, 2009 10:55 AM User is offline

Conversion was done by a Porsche shop back in 2007. I did not own the car at that time. I purchased it about a month ago. AC was not cooling when I bought it. Just getting around to fixing it. According the the records there was a new compressor, dryer, etc done. Over 2000.00 dollars worth of stuff.

TRB on Thu August 27, 2009 11:05 AM User is offlineView users profile

Are those pressures at idle or 1500 RPM?

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robs on Thu August 27, 2009 11:15 AM User is offlineView users profile

Do you know if they upgraded the condenser to a parallel flow?

thill944 on Thu August 27, 2009 11:19 AM User is offline

At idle

thill944 on Thu August 27, 2009 11:21 AM User is offline

Do not know about parallel flow but evidently the AC worked fine after the conversion

TRB on Thu August 27, 2009 11:24 AM User is offlineView users profile

I would suggest posting the pressures at 1500 RPM.

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

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

thill944 on Thu August 27, 2009 11:26 AM User is offline

Pressure were at idle around 1000 rpm. After putting in the refrigerant the sight glass is still cludy after running the car 15 to 20 minutes. Should I add some more refrigerant? I couldn't tell any difference after adding the 12 ounces.

TRB on Thu August 27, 2009 11:38 AM User is offlineView users profile

No I would get a fast idle pressure reading before I did anything! That's just what I would do in my shop. Do you even know how much refrigerant is currently in the system as well as the current oil capacity? All of these can effect how the system operates!

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

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

thill944 on Thu August 27, 2009 11:44 AM User is offline

I have no idea how much refrig is in the system now. Is there any way to tell? I will get a reading at 1500 RPM tonight. The capacity is around 860 grams or around 31 Ounces.

TRB on Thu August 27, 2009 11:51 AM User is offlineView users profile

Using a reclaiming machine is the only way I know how to verify the refrigerant level.

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

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

bohica2xo on Thu August 27, 2009 12:54 PM User is offline

On the 944, you need to do a full load test.

Doors open, cabin fan on highest speed. Run the engine at or above 2,000 rpm. Let the system stabilize at speed for 5 minutes, and record the pressures while the engine is still at 2,000 rpm. Record the vent temperature (stick type thermometer 50mm deep in the center vent) and the ambient temperature in front of the car.

Do NOT add any more refrigerant until you have the results of this test.

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.

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