air conditioner not working all the time - Ford Powerstroke Diesel Forum
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Old 06-17-2014, 03:58 PM
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air conditioner not working all the time

99 f350 7.3/ my air will blow cold at first but when cruising down road it will stop blowing cold air. if i slow down and then speed up like at a intersection it will blow cold air for a few minutes then quit again.
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Old 06-17-2014, 04:42 PM
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Low on freon


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Old 06-17-2014, 05:34 PM
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Could be low on Freon or maybe the pulley shims?
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Old 06-17-2014, 07:18 PM
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I would start by first taking a garden hose to your condenser and cleaning out the gab between it and the radiator/intercooler.

Then I would check your AC pressures. You're looking for something in the 35-40 PSI on the low side.

Doubt its the clutch, if it was shimmed out too far it would be grinding when it tries to engage.
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Old 06-18-2014, 07:43 AM
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Mine was doing the same thing when I bought it. Checked the refrigerant and it was good. Mine ended up being the air gap for the compressor clutch plate was too large. Next time it does it if you can stop get out and see if the plate on the front of the compressor is turning or not. Removed a shim, corrected gap, Worked Great ever since. You can Google it and find how to check it and set it.
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Old 06-18-2014, 09:17 AM
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Quote:
Doubt its the clutch, if it was shimmed out too far it would be grinding when it tries to engage
The problem is when the electrical coil is cool it has more magnetic pull (this is why it starts out cooling). Then when the compressor heats up, and the cabin temp reaches set point and the compressor drops out. When it calls for the compressor to engage again the magnetic coil is energized but the air gap is too great for the heated/weakened coil to pull it in. A good test is to have your truck at operating temp and with the key on and the engine off turn the AC control to max and see if it closes the air gap on the compressor. If it does not, push on the clutch face or tap it with a whench or screwdriver and if it closes then the shim needs removing. FWIW my truck had the exact same symptoms and the air gap was the problem. It's an easy test/fix and best of all its FREE!
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