Isx fan
08-08-2020, (Subject: Isx fan ) 
Post: #1
Isx fan
I’m looking at a 09 388 Pete with isx . When I first started the fan was on understandable low air but at what point dose it shut off. I ran truck for a while and it was on the whole time no a/c on or defrost. Temp came up 150-160 it seemed to stay on the whole time. I know when it go’s bad it locks. Is this normal. New to Cummins. Thanks.
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08-08-2020, (Subject: Isx fan ) 
Post: #2
RE: Isx fan
could be rusted shut... happens when truck sits for a while, is common.
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08-09-2020, (Subject: Isx fan ) 
Post: #3
RE: Isx fan
Can be a variety of things but none of them would be a deal breaker if the rest of the truck impresses you.

Most of time it's an AC pressure switch, bad fan solenoid or rust as Rawze said.
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08-09-2020, (Subject: Isx fan ) 
Post: #4
RE: Isx fan
Thanks I didn’t know if it staying on was a normal thing I’m assuming after air pressure is up it should be off. When cold start up with nothing ac related is on.
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08-09-2020, (Subject: Isx fan ) 
Post: #5
RE: Isx fan
at 90 PSI the fan should shutoff unless the clutch is rusty and stuck or its being commanded on by either AC/Coolant Temp/Charge Air Temp/manual fan switch


User's Signature: 2010 Lonestar - CM871 - 13sp - 3.70s, 2016 T680 - cm2350 - 13sp - 3.36s - skateboarder
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