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Low side pressure drops at 1500, high side goes way up!

rgnprof on Thu July 07, 2011 9:43 PM User is offline

Year: 2000
Make: Honda
Model: Civic
Engine Size: 4 cyl
Refrigerant Type: R134a
Ambient Temp: 100
Pressure Low: 40
Pressure High: 225
Country of Origin: United States

Trying to help a friend with his AC problem - no cool air at all. Clutch is engaging, put gauges on and had Low side pressure = 40 and high side = 225. Revved the car to approx 1500 rpm and low side drops to 10-15 and high side increases to 350+. What is going on? After returning the car to idle the high side stays at 350 and even climbs some...

Thanks, ryan

TRB on Thu July 07, 2011 11:57 PM User is offlineView users profile

Are the fans working correctly? How much refrigerant is in the system?


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rgnprof on Fri July 08, 2011 10:15 AM User is offline

I have no idea about how much refrigerant...and, the electric fan did not come on at all.

mk378 on Fri July 08, 2011 10:27 AM User is offline

The condenser fan is wired to be on any time the compressor is on, so there is the problem. Without the fan, condenser overheats and the pressure rises out of control.
Check the condenser ground wire, fan motor and relay. It's powered through the same fuse as the compressor so the fuse must be good.

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