Fans will not turn off

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Posts: 1
Joined: Sat Aug 20, 2022 3:32 pm

Fans will not turn off

Postby s14rb25 » Sat Aug 20, 2022 3:43 pm

HI Guys, Having some issues with fans. Elite750

I'm using DPO 4 to control my fans through a relay, triggered by coolant temp, turn on at 85c and off at 80c (or thereabouts) and all was working perfectly.
Today I started my car and the fans immediately came on. Coolant temp is reading correctly. I can shut off the engine and enable the *disable fans when engine not running* function and they will turn off, so the relay is working fine and all the wiring seems to be good. I've tried changing the temp at which they will switch and no difference.
Any ideas?


Posts: 22
Joined: Tue Feb 19, 2019 6:32 am

Re: Fans will not turn off

Postby impelz06 » Wed Oct 12, 2022 2:08 pm

I had something similar happen, DPO was pegged at 100% regardless of coolant temp vs duty cycle.

I had to go into CTS calibration and change it over to voltage instead of resistance (even though I manually configured the CTS in Ohms vs temp). No idea why but a bug in the software I guess.

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