Coyote Gen 3 Controlled Fan Stays On After Tuning

[32J]

Hi All,

Just had my Coyote Gen 3 dyno-tuned with a local mechanic. Engine is running great. However, I noticed that the radiator fan now comes on right away, even when the engine is cold. And it no longer turns off. It's controlled by the PCM. Before the tune, it came on at about 195°F and turned off at about 190F°, just like the Coyote fitment manual stated.

I attached an OBDII reader and no trouble-codes came up. Somehow, the 'inferred' engine coolant temperature is reading high enough to tell the PCM to keep the fan running. This morning I sent an email to the tuner and I hope to hear back from him within the week.

Just wondering if anyone else has come across this problem?

Thanks,

32J+

[RPMG]

I know this is an old thread but did this get resolved?? I have the same issue.

[Erik W. Treves]

I would talk to the tuner - there is a setting in there that they can and do mess with - specifically for the fan.

[Alan_C]

Pretty clear cut the tune changed something in the PCM controlling the fan.