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Old 06-29-2007, 12:19 PM   #1
Frank91
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Default Engine fan only turns on when AC is on ?

Question I have a 1991 SL1 4cyl the engine fan only turns on if the AC is on.

On hot days I have to click the AC off and On to make the engine fan run any idea what is the problem I checked all the fuses under the dash all are good not sure if it is a wiring problem or not and if so where should i look.

Any help would be good Thanks.

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Old 06-29-2007, 12:26 PM   #2
bobc455
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Default Re: Engine fan only turns on when AC is on ?

How hot have you had the engine? Has it boiled over without the fan ever coming on?

If the engine is not "too" hot, the fan doesn't kick on. It is not on all the time, only when it needs it.

(The A/C requires a fan when, so when you turn on the A/C the fan runs regardless of engine temp)

-BC

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Old 06-29-2007, 12:32 PM   #3
Frank91
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Default Re: Engine fan only turns on when AC is on ?

Hello Bob thanks for the reply I have let the temp get almost to the red to see if it would turn on and it never did.
I have had the car for about 3yrs and never saw the engine fan come on unless I turn the AC on and off.

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Old 06-29-2007, 12:47 PM   #4
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1996 SW2
Default Re: Engine fan only turns on when AC is on ?

Prime suspect: ECTS. Visit our How-To Library; the first couple of "Sticky" threads describe how/why it fails, how to replace it. It's a one-off fix.

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Old 06-29-2007, 01:11 PM   #5
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Default Re: Engine fan only turns on when AC is on ?

thanks I'll check that out.

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Old 06-29-2007, 01:22 PM   #6
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Default Re: Engine fan only turns on when AC is on ?

Yea that might be it because the temp gauge works fine just the engine fan will not come on the temp could be in the red very hot and still no fan only comes on if I turn the AC on and off.

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Old 06-30-2007, 04:43 AM   #7
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Default Re: Engine fan only turns on when AC is on ?

Even if the ECTS is good, the fan won't come on until it hits the RED. It's some where around 220 degrees. A lot of guys have put in a manual by-pass fan switch, so they don't have to run the AC to cool down the engine when they're stuck in traffic,

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Old 06-30-2007, 04:46 AM   #8
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Default Re: Engine fan only turns on when AC is on ?

Quote:
Originally Posted by stevestar99 View Post
Even if the ECTS is good, the fan won't come on until it hits the RED. It's some where around 220 degrees. A lot of guys have put in a manual by-pass fan switch, so they don't have to run the AC to cool down the engine when they're stuck in traffic,
It comes on before red, just not much before red...and that's only on the older S-Series. 1995 and older were like that, in 1996 and above, Saturn made it so the fan came on sooner.

But, I'd look into the ECTS, because chances are you probably still have the plastic-tipped one in there regardless. You want to replace it with a brass-tipped one from the Saturn retailer.

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Old 06-30-2007, 08:04 AM   #9
RickKlages
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Default Re: Engine fan only turns on when AC is on ?

ECTS = Excellent Corrective Tonic for Saturn. How one little cheap part can cause so many headaches!

All Saturn owners begin the mantra:

ECTS
ECTS
ECTS
ETCS
....
....
....
ad infinitum



ick

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