Coolant Fan Stays on Overnight on my 93 FD.

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01-09-13, 09:40 PM

Kfailla

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Coolant Fan Stays on Overnight on my 93 FD.

Hey everyone,

So just this morning my battery died, because the fan was running all night long. I know it's normal for the fan to be on still minutes after a normal temperature engine, but this thing stays on all night. Any ideas?

I pop out the fan fuse overnight for now, but it's a first to leave a fuse on my nightstand.

Just need some opinions I guess before I start digging in. Thanks for your time!

Last edited by misterstyx69; 01-09-13 at 10:01 PM.

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01-09-13, 09:59 PM

misterstyx69

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In the future it is nice to inform people of what type of car that you have so they can help you.
............1993 FD Guys........................(Yes,I edited your Title!)

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01-10-13, 07:42 AM

Sgtblue

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Actually it's NOT a stock situation for the fans to run after shutdown. Sounds like someone did 'the fan mod", which is simply grounding a wire at the ECU. Doing so will cause the fans to run for 10 minutes after shut down IF the temperature is above a certain threshold. More info here:
Cooling Fan Modification

Check and see if that wire is grounded. If it is, disconnecting it may solve your problem. But the actual cause maybe a bad coolant thermoswitch. If you end up changing the thermoswtich, I recommed the S5 version, which has a lower (95 C.) threshold rather than the S6 version (108 C.)