Question about 1992 Chevrolet C1500

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Compressor will only come on going down the road ,could the low pressure switch be bador what could it be?

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There is no way to tell until you have the system checked for current pressure. It may just be low

Posted on May 28, 2010

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1 Answer

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Replace the oil filter as it is clogged very cheap fix. I hope this helps.

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If the car was retro fitted with R134a this was a common problem. There was a low side pressure sensor that needs to be changed. R134a runs different pressures than the r12.. When you go down the road the condenser cools off the system and the pressure drops below the minimum pressure. You need to make sure that the system is fully charged, not just cold to the feel. Both pipes coming out of the firewall need to be the same temp. this makes sure that the evaporator is flooded.
I hope this helped. Re-post if you need more info. Have a nice day and good luck.

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Pressure switch is most likely located on the receiver/dryer.
If the fan is failing, there is low pressure in the a/c system.

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There is no interrupter switch on the a/c system. The only reasons that the clutch wouldn't engage is
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