97 blazer a/c v6 Vortec

[GT11]

I Jump the pressure switch. Start the truck and put the fan on high and ac switch on max cold. Compressor will not run. I bump the clutch on the compressor with a flash light and it engages and starts to cool (touch cold on the accumulator). I then turn off the ac in the cab. The compressor stops, as expected. I wait about a minute and turn the ac controls on again and the same thing happens. Compressor will not run unless I bump the clucth assembly on the compressor. Whats going on?

Thanks

GT

[MT-2500]

Originally Posted by GT11

Heres one for ya. I Jump the pressure switch. Start the truck and put the fan on high and ac switch on max cold. Compressor is will runn. I bump the clutch on the compressor with a flash light and it engages and starts to cool (touch cold on the accumulator). I turn off the ac in the cab. The compressor stops, as expected. I wait about a minute and turn the ac controls on again and the same thing happens. Compressor will not run unless I bump the clucth assembly on the compressor. Whats going on?

Thanks

GT

Check the air gap on the clutch.
Not sure what the specs are but around .015-.025" with out rubbing anyplace would get it.
If it is good look for a lose connection or bad coil in compresser clutch.

[GT11]

Originally Posted by GT11

I Jump the pressure switch. Start the truck and put the fan on high and ac switch on max cold. Compressor will not run. I bump the clutch on the compressor with a flash light and it engages and starts to cool (touch cold on the accumulator). I then turn off the ac in the cab. The compressor stops, as expected. I wait about a minute and turn the ac controls on again and the same thing happens. Compressor will not run unless I bump the clucth assembly on the compressor. Whats going on?

Thanks

GT

Any help, please.?.

[MT-2500]

Originally Posted by GT11

Any help, please.?.

Check the air gap on the clutch.
Not sure what the specs are but around .015-.025" with out rubbing anyplace would get it.
If it is good look for a lose connection or bad coil in compresser clutch.
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[BlazerLT]

Sounds like a buggy low pressure switch.