Does the truck have a manual fan switch? Does the fan come on at all when the engine gets hot?
2015 389 Peterbilt
Discussion in 'Trucks [ Eighteen Wheelers ]' started by KittyKicker, Sep 14, 2019.
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stillwurkin Thanks this.
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KittyKicker Thanks this.
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Driver just called me. He found 2 more switches in the ac system behind the dryer (I thought he had already checked them but he didn't realize they were there) and he unplugged them. He said they are full of dirt and grime, but he plugged them back in and now everything is working. When he gets back I'm going to clean everything up and replace those 2 switches just to be safe. Thanks for the help, everyone!
stillwurkin and AModelCat Thank this. -
KittyKicker Thanks this.
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The low pressure switch kicks the compressor on at 50 psi. Shuts off at 20 psi.
The hi pressure switch shuts the compressor off if it gets overcharged and hi pressure gets too hi. I"m not sure on that number as those big fans on semis pull a lot of air. Therefore, hi pressure on semis don't read as hi as cars. It's somewhere between 350 and 400 psi.
The other hi pressure switch switch kicks the fan on when hi pressure gets hi enough. As in idle and parked. Driving down the freeway there's enough air going through the condensor so fan isn't needed.
I'm not sure on gliders, and it might be different on semis entirely. But the ac electrical system is controlled through the body control module. BCM.
No clue on the fan though when ac is not needed. Other then what was already mentioned.KittyKicker Thanks this.
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