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High low side 250 high side compressor not engaging

aminoacid on Mon May 28, 2012 9:30 PM User is offline

Year: 2003
Make: Mitsubishi
Model: Galant
Engine Size: 2.4
Refrigerant Type: r134a
Ambient Temp: 85
Pressure Low: 90
Pressure High: 250
Country of Origin: United States

Hello everybody. I'm a noob here and been lurking on forums searching for help for anybody with my AC system.
I dont know much history on the car.
blower works fine, AC light turns on when control knob engaged
compressor not kicking on and no voltage going to it wich AC in ON position.

hooked up my manifold gauges and the Low side is around 90'sh and high side initially was at about 125, after jumping the clutch (giving it 12volts manually) the clutch kicks on and high side pressures increase to 250 and low side starts to decrease when the compressor is on and creaps back up when I cut the voltage to the compressor. I didn't leave the compressor jumped for more than several seconds affraid something is going to pop, but I beleive the vents began to blow out slight coolness but like I said was affraid the low side was way too high and didnt want something to explode.
Can anybody guide me on what to do or have an idea what this could be?

My understanding is that if the pressures are too high or too low anywhere then that would cut off voltage to the compressor. Should I maybe take it to a pro to reclaim and refill the system and go from there? I need this done on the cheap I cant afford high mechancic prices. DIY all the way if i'm able to.

Thanks alot in advance.

mk378 on Mon May 28, 2012 9:34 PM User is offline

Pressures look OK, the compressor should run like that. There is an electrical problem. You're right to not jump the compressor for very long because without the condenser fans running, there will be a dangerous overpressure. Speaking of that, do the condenser fans start when you press the button?

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