AC compressor quite when engine warm?
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Trailering
Joined: Jan 2024
Posts: 18
Likes: 1
AC compressor quite when engine warm?
As the title states- AC is great when I start the truck for the first time in the morning (2016 6.7) and after about 15 minutes the AC compressor won't come on anymore. 13.95V at the compressor clutch wiring. Charge is good. Any ideas?
Laughing Gas
Joined: May 2024
Posts: 915
Likes: 296
From: E TN
You have voltage, do you have ground? When the clutch has voltage and won't engage use the handle of a hammer and tap the clutch face pushing it back towards the pulley. If it engages the clutch has too much gap or the magnet is weak.
Fleet Mechanic
Joined: Aug 2011
Posts: 1,577
Likes: 264
This is actually very common with electromagnetic clutches that the air gap gets too large, when cold they produce a bit more magnetic force and can pull the clutch in, when they get hot they loose some pulling power and fail to pull the clutch in. Check the gap between the pulley and clutch plate, should be under 0.030 inch.
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