A/C Coil?
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A/C Coil?
O.K. guys, here goes. I have been going through the A/C on my '91 f150. It all started because the compressor went out, and Dad decided to replace it. I have replaced the accumulator, orifice tube, and cycling switch. I put new oil in the compressor, evacuated, and charged the system. I am an HVAC tech, and this is all pretty much normal work for me. The problem I'm having is that once the a/c has ran, and when it does it runs great, if I shut it off or shut the truck off and go into the store, when I try to start the A/C back up it won't engage the clutch. I am guessing that the coil is getting hot and just doesn't have enough OOMPH to pull it back in. What do you think? I see this alot at work on contactors for compressors. This is the only thing I can think of. Any help would be greatly apprciated!
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update, what to do?
So, I took your advice, and got it down to the coil which is mounted on the compressor, and the shaft. The pulley is off, the clutch is off, and I only have one spacer washer. If I remove said washer the clutch rubs on the pulley no matter what. Now it seems with different feeler gauges that I have about .033 air gap with the washer installed. Do I need to put a new coil in? Also, I got told today by my dad that it wasn't a new compressor, and the compressor is out of a '91 or '92 Explorer. Does this matter? I'm beginning to look for dynamite! Again, any help is greatly appreciated!
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Joined: Jan 2009
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From: Brampton, On. Can.
If everything checks out electrically, you'll need to close up the gap.
The next time it doesn't pull in the clutch, turn off the engine and turn the ignition back on to the run position and the AC to max. Press on the face of the clutch. If it snaps in like it should, the gap is too big.
If you can't find or make a thinner washer, try a local AC shop. They should have a thinner shim washer. When you buy a new clutch, it comes with a selection of shim thicknesses.
I had a '97 F150 and the clutch would stop working after 10-15 minutes after starting. The compressor would heatup and expand things enough that the gap would open up just enough that the clutch wouldn't engage.
The next time it doesn't pull in the clutch, turn off the engine and turn the ignition back on to the run position and the AC to max. Press on the face of the clutch. If it snaps in like it should, the gap is too big.
If you can't find or make a thinner washer, try a local AC shop. They should have a thinner shim washer. When you buy a new clutch, it comes with a selection of shim thicknesses.
I had a '97 F150 and the clutch would stop working after 10-15 minutes after starting. The compressor would heatup and expand things enough that the gap would open up just enough that the clutch wouldn't engage.
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