Electric fans

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Jan 17, 2004 | 08:27 PM

Pro

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Electric fans

Are they supposed to be on when just turning the key AND NOT being in diagnostic mode?

Jan 17, 2004 | 09:20 PM

Pro

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if someone could just walk outside and turn the key and see....

Jan 17, 2004 | 10:00 PM

TheGreatJ

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Joined: Apr 2000

Posts: 1,677

From: T-town

Only if it's hot enough to kick them on, or possibly if the A/C switch is on. If the A/C is off and she's not hot and they're coming on with the key...they're either straight-wired or you have a bad fan switch/relay.

Jan 17, 2004 | 10:10 PM

Pro

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The car is cold and the AC isnt on. The car constantly thinks it is in diagnostic mode I suppose.

Jan 17, 2004 | 10:22 PM

IROC-T

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Joined: Jun 2003

Posts: 866

From: So.Cal on the Best coast

Quote:

Originally posted by Pro
The car is cold and the AC isnt on. The car constantly thinks it is in diagnostic mode I suppose.

I don't think your car is in diognastic mode,I agree with TGJ that your fans are straight(hard wired)wired,or your relay is stuck,or a bad temp sensor.

Last edited by IROC-T; Jan 17, 2004 at 10:24 PM.

Jan 18, 2004 | 10:13 AM

TheGreatJ

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Joined: Apr 2000

Posts: 1,677

From: T-town

They shouldn't come on in diagnostic mode IIRC. I know when I hook one to my Snap-On scanner to pull codes at work they don't come on.

Ford vehicles will turn them on for a few seconds during a KOEO diagnostic test, but as I recall GM cars won't do it unless you're running an ECM output test (checking relays and such.)

Check your wiring. Straight-wiring the fans is a common band-aid for these cars.

Jan 18, 2004 | 10:22 AM

Pro

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Quote:

Originally posted by TheGreatJ
They shouldn't come on in diagnostic mode IIRC. I know when I hook one to my Snap-On scanner to pull codes at work they don't come on.

Ford vehicles will turn them on for a few seconds during a KOEO diagnostic test, but as I recall GM cars won't do it unless you're running an ECM output test (checking relays and such.)

Check your wiring. Straight-wiring the fans is a common band-aid for these cars.

What do you mean by straight wiring - that whenever the ignition is on or vehicle is running, that the fans are turning? If so, they cant be - the fans turn off when the vehicle is started.