fan problem?

Subject: fan problem? Tue Aug 11, 2009 12:16 am

i noticed today when i got out the car with engine off and ignition still on, that the fans kept running.. this is good i guess but as soon as i turned off the ignition, the fans shut down, and right away when i turned the ignition back on they came on again. are they not supposed to stay on for awhile regardless whether im away from the car until the rad cools down? like most cars? or might i have a problem somwhere? the gremlin like personality of this car is most disturbing! she's like my girl friend, when i put the key in i never know what im getting into... dunce

Subject: Re: fan problem? Tue Aug 11, 2009 12:22 am

I believe the fans only stay on like that on the W-bodies.

Subject: Re: fan problem? Tue Aug 11, 2009 12:23 am

ya mean whether the ignition is on or not?

Subject: Re: fan problem? Tue Aug 11, 2009 12:29 am

robotennis61 wrote:: ya mean whether the ignition is on or not?

Well I've just read that their fans stay on after the car is shut off unlike ours.

Subject: Re: fan problem? Tue Aug 11, 2009 12:31 am

dat sux's there must be a way to have them continue for a bit to bring the rad temp down after shut down?

Subject: Re: fan problem? Tue Aug 11, 2009 12:34 am

robotennis61 wrote:: dat sux's there must be a way to have them continue for a bit to bring the rad temp down after shut down?

Might be able to with a tuner although i haven't looked into it.

Subject: Re: fan problem? Tue Aug 11, 2009 12:42 am

that is strange though? did gm think that we might just hang out in the car until the fans decided to turn off? wtf!

Subject: Re: fan problem? Tue Aug 11, 2009 8:44 am

Was your car hot at the time? If so, it sounds like they are working properly to me.

There is a way to hack the PCM to make the fans stay on after the key is off, this is a tweak available to the W-body guys but for our cars you have to modify something on a circuit somewhere, and I forget exactly what. It's not straightforward though, and IMO not worth doing. Sorry I can't be more clear, I read about this a few years ago and decided it wasn't worth going after, and forgot it.

Subject: Re: fan problem? Tue Aug 11, 2009 8:47 am

The PCM for Series II engines is programmed for fan on after engine off, but it does not seem to be activated. Yours being a '95, it could be different. I have tried testing it by changing the values, but it does not work for my Series II.

But for normal use there's really no reason to let the fan run with car off unless the engine is really, really hot. Our engines are fine just cooling down on their own, maybe it's better because slow temp change is usually easier of engine parts than an abrupt change - same with heating up.

The reason I'd want to do it is when at the track, when you want to cool the blower down between runs. Then it makes some sense.

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Subject: Re: fan problem? Tue Aug 11, 2009 5:07 pm

got it! yeah she was hot..just seems weird i never noticed it before?