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Old 04-11-2018, 12:47 AM   #1
Tropicalcats
 
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Default A/c Compressor test

In very basic terms pictures would be great can somebody explain to me how I can check to see if my compressor is working on my AC in my 95 hardbody. I get the greenlight but the compressor is not turning on not sure if I have a leak in the system or if itís a bad compressor.
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Old 04-11-2018, 03:04 AM   #2
cadillacdude1975
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Unlug the sensor located on the dryer, right beside the passenger headlight. Jump the connection with a paperclip on the harness side. You can do this with the engine running and the ac controls on with the blower on high.

That is the pressure cutout switch. Jumping the two pins sends the signal to the ecm that the freon is at a satisfactory level so the system won’t explode.
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Old 04-11-2018, 03:03 PM   #3
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Quote:
Originally Posted by cadillacdude1975 View Post
Unlug the sensor located on the dryer, right beside the passenger headlight. Jump the connection with a paperclip on the harness side. You can do this with the engine running and the ac controls on with the blower on high.

That is the pressure cutout switch. Jumping the two pins sends the signal to the ecm that the freon is at a satisfactory level so the system wonít explode.
1. Just do the above test for a few seconds. Because running a system low on refrigerant will harm the compressor.
2. Follow up with a static pressure check, if the pressure of the system is too low, then the safety feature of that pressure switch will prevent compressor clutch engagement.

A 1995 uses R134a, so if you don't have a gauge set Autozone has free loaner ones.
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Old 04-11-2018, 06:33 PM   #4
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yup. bypassing that switch makes the system think it is full. the real way is to connect a set of ac manifold gauges to the ac system. but for a few seconds, it wont hurt.
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