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better vent temps

chillin on Tue June 30, 2009 10:08 PM User is offlineView users profile

Year: 1992
Make: cheverolet
Model: 1500
Engine Size: 4.3
Refrigerant Type: 134a
Ambient Temp: 95
Pressure Low: 41
Pressure High: 325
Country of Origin: United States

Pulled deep vacuum weighed in 36 oz of 134a 80%. After these readings sprayed cond. dropped like a rock put on new fan clutch.Cleaned condensor alot of fins were bent straightened best I could best vent temps 58 at 1500 rpm. but short drive on highway vent temps of 46.Any sugestions on better vent temps would be greatly appreciated.

fonebone on Wed July 01, 2009 1:26 AM User is offline

Hi chillin; Here http://www.ackits.com/aacf/ptchart.cfm ( forgot how to put a "Live" link) is the pressure/temp chart for r-134. Note that at 95 degrees you should be much lower on your high side readings, and your low side looks a bit high, also. Your 80 percent charge is only a ballpark figure, and does not necessarily mean it is the least amount to start with, and then add more to get lower temps. Sometimes this 80 percent of charge, in your case, is already too much. My guess, evacuate some out, your high side will drop, and your low side and correspondingly, your inside vent temps will also. Monitor your vent temps with a digital gage--easy to read, quickly shows temp changes. When your high side comes down to what is on the chart, you should be cooling better. Hope this helps. Any of the resident Pros please add or subtract as required

Edited: Thu July 02, 2009 at 5:57 PM by fonebone

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