Coolant Fan Stays on Overnight on my 93 FD.

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Jan 9, 2013 | 09:40 PM

Kfailla

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From: San Antonio

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; Jan 9, 2013 at 10:01 PM.

Jan 9, 2013 | 09:59 PM

misterstyx69

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From: Smiths Falls.(near Ottawa!.Mapquest IT!)

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!)

Jan 10, 2013 | 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.)