AC stops working - Diesel Forum - TheDieselStop.com
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Go Back   Diesel Forum - TheDieselStop.com > 1999-2007 Ford Super Duties > 99 & up 7.3L Power Stroke Engine and Drivetrain

99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 07-14-2011, 11:24 AM   #1 (permalink)
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AC stops working

works fine for awhile and then just stops...turn off and on couple times and starts again..is that a sensor or relay? on the 2002.
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Old 07-14-2011, 12:42 PM   #2 (permalink)
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Possibly, sounds more like the clutch though.
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Old 07-14-2011, 01:09 PM   #3 (permalink)
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And as always, don't forget to check your air gap... airgap.pdf
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Old 07-14-2011, 11:03 PM   #4 (permalink)
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check the plug to the compressor too. mine got hot somehow and doesn't make a good connection. it would intermitently go off and on
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Old 07-19-2011, 04:13 PM   #5 (permalink)
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mine quits working after about 20 miles down the road. If you let of the accelerator it starts blowing cold again. It usually begins around 70 mph to stop blowing cold. A guy at O'reilly's auto parts seems to think it's a screen clogged in the line that catches trash in the refrigerant line. Anytime I get back down to 45 mph or less it works great! Any help out there?
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Old 07-19-2011, 04:42 PM   #6 (permalink)
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My 02 F-250 was doing the same thing. When it was real hot it would quit cooling. Removed the outer compresser clutch plate, removed the small spacer washer (which closed the air gap) & put the plate back on. Works great.
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Old 07-19-2011, 05:08 PM   #7 (permalink)
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I read that same thing today, thanks. But why in the world did that "fix" it? I've got 166,000 miles and it just started, is the clutch going or something?
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Old 07-19-2011, 05:13 PM   #8 (permalink)
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What happens is the clutch end plate wears to the point where the electromagnet can no longer maintain engagement reliably. Decreasing the gap reduces the force required to stay engaged. You can buy a new end plate if yours looks too chewed up, but just correcting the gap works and will buy you some extra time.
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Old 07-19-2011, 05:24 PM   #9 (permalink)
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Gotcha! Thanks!
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Old 07-23-2011, 11:50 AM   #10 (permalink)
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Last year, it was the plug and pressure switch. Changed those out, and it worked fine till a couple weeks ago. Checked the gap...it was .055, took out the washer, new gap is .014, and all is good...no cutting out.
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