Isx fan

[Cmap]

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.

[Rawze]

could be rusted shut... happens when truck sits for a while, is common.
http://rawze.com/forums/showthread.php?t...5#pid37235

[Signature620]

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.

[Cmap]

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.

[Lonestar10]

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