AC compressor cycling every 10 seconds. Help please! - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 07-07-2014, 01:38 PM Thread Starter
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AC compressor cycling every 10 seconds. Help please!

Until last week I've never had an issue with my ac. One day it was just blowing warm air. I put gauges on it and it would jump from 10psi to 80+ over and over. After a few minutes it stabilized at around 20psi. I added r134a till it got to about 40psi (and the can was empty). It was working great, then it seemed to get warmer after a few days. Today it was just warm again, so I figured I had a leak. I put a small can of leak sealer in it and then tried to add more 134a to it. The gauge is still jumping up and down, but I Got up to close to 50psi (full) when it spikes. Still no cold air, so I climbed under the truck to check the compressor. The clutch engages for 2 seconds then off for 9-10 seconds and repeats over and over. I don't have gap measurements, but it's a tiny gap and I didn't see any shim. I bought the truck with 152k on it, so maybe it had already been removed? Also, I checked the two pin plug on the compressor and it's tight, but I wiggled it anyway. No change. It's in the upper 90s here and can't work with no air. Please let me know what to check
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post #2 of 8 Old 07-07-2014, 01:53 PM Thread Starter
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Forgot to mention, when the pressure drops is when the compressor engages, when it starts rising again is when it cycles off. Also, I tried putting some pressure on the clutch and it didn't catch to engage.
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post #3 of 8 Old 07-07-2014, 02:23 PM
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are you against taking it to a shop for service ?

fix a leak and throwing refrigerant at a system may compromise it's longevity

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post #4 of 8 Old 07-07-2014, 03:18 PM Thread Starter
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I'd love to take it to a shop, but my bank account won't let me
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post #5 of 8 Old 07-07-2014, 03:26 PM
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lol

i get that

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post #6 of 8 Old 07-08-2014, 12:29 PM Thread Starter
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Guess nobody has an idea...
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post #7 of 8 Old 07-08-2014, 12:32 PM
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Fix the leak

GD - 06 CCSB FX4 Lariat
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My magic wand broke a few years back when my crystal ball fell on it. Ruined the ball too. So we're going to have to figure this one out another way. YOU NEED A MONITOR or at least a good scanner.
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post #8 of 8 Old 08-06-2014, 03:12 PM
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Sounds like mine. from research and talking to HVAC friends, its the typical sign of low refridgerant. My compressor would build to 60 and drop really fast to about 20 and kick off immediately. The AC keeps up when its not over 95, but I'm pretty sure its something in the compressor or I wouldn't have ANY cool air.
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