compressor clutch relay?
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More Turbo
Joined: Feb 2004
Posts: 509
Likes: 3
From: Findlay, Il
compressor clutch relay?
99F250 SD; What relay controls the ac compressor clutch? Not getting power to engage
"Simple question"
I would just like to know which relay to check!
All this other info will be of help once I check the basics first. I get it.
"Simple question"
I would just like to know which relay to check!
All this other info will be of help once I check the basics first. I get it.
Cargo Master
Joined: Apr 2022
Posts: 3,201
Likes: 1,704
Jumper wires are good friends.
Logistics Pro
Joined: Nov 2006
Posts: 3,679
Likes: 370
From: Fallon,NV & Bainbridge OH
I agree, I use them all the time. But only when either verifying the compressor works or after having the system open and recharging. If you have know idea on the system (the OP did not offer any additional info) it could destroy things very quickly.
Logistics Pro
Joined: Nov 2006
Posts: 3,679
Likes: 370
From: Fallon,NV & Bainbridge OH
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Lead Driver
Joined: Jul 2003
Posts: 7,406
Likes: 52
From: Wheatland, Mo
With engine running turn on the AC and start moving the wires a bit going into the AC pump. Mine would work, then not work...eventually not at all. I was watching the operation of the clutch and while looking around bumped the wires and it worked, then stopped. It didn't look broken but it was inside the wiring insulation. New pig tail and all good to go. Still working fine after 10+ yrs
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Cargo Master
Joined: Apr 2022
Posts: 3,201
Likes: 1,704
Also the air gap on clutch is known to get to big and won't click in. You can tap end of clutch with a screwdriver handle and see if it will kick in. If it does jus toull outer clutch piece riff and remove a shim. But if you don't have power going thats not going to fix it. But it is a common problem with them.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
X2 on checking that pressure switch plug. I've had to replace the switch and the plug twice over the years due to burned out pins down inside the plug blocking current flow. Undersized connectors for the load fries them on a regular basis. At least that's the way it is on my truck.
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