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Old 03-26-2014, 09:27 AM   #1
1916fenian
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1992 SL1
Default coolant fan modification

I just bought a 92 SL1 and the previous owner put the coolant / radiator fan on a push switch on the dash, can anyone here think of why this was done?

Obviously the fan motor functions so perhaps something before the motor is faulty?

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Old 03-26-2014, 09:33 AM   #2
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1992 SL1
Default Re: coolant fan modification

also, does anyone have a source for a clear schematic / diagram for the wiring so I can try to rewire it back to original?

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Old 03-26-2014, 09:35 AM   #3
cleverbot
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Default Re: coolant fan modification

My 94 had the same thing done to it. It was because of the ECTS never being replaced. Or the thermostat being replaced because soon after replacing the ECTS my thermostat failed. So replacing them both and rewiring everything back to the way it was should fix those issues.

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Old 03-26-2014, 09:58 AM   #4
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Default Re: coolant fan modification

Diagram in post 2
http://www.saturnfans.com/forums/sho...d.php?t=194113

In addition to a faulty ECTS (which will never turn the fan on, regardless of temp), some people put in a manual fan switch because of the way the temp gauge was calibrated. From '91 to '95, normal warm operating temps were between 1/2 on the gauge, and about 3/4 on the gauge. Fan turned on around the 3/4 mark, which, on the gauge face, seemed close to the red/ overheat area. That freaked people out, even though that was within spec, so they installed manual fan switches to turn the fan on over the 1/2 mark.

For '96-02, the gauge was recalibrated. 1/2 on the old gauges was now 3/8 on the new gauges. 3/4 on the old gauges now showed as 1/2 on the newer gauges, even though the actual coolant temp was the same in both cases. Less panicky owners

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Old 03-26-2014, 10:29 AM   #5
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1998 SL2
Default Re: coolant fan modification

I installed one in my car because I wanted to be able to turn the fan on in traffic to keep the temperature constant.

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Old 03-26-2014, 09:36 PM   #6
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1995 SL1
Default Re: coolant fan modification

Quote:
Originally Posted by alordofchaos View Post
Diagram in post 2
http://www.saturnfans.com/forums/sho...d.php?t=194113

In addition to a faulty ECTS (which will never turn the fan on, regardless of temp), some people put in a manual fan switch because of the way the temp gauge was calibrated. From '91 to '95, normal warm operating temps were between 1/2 on the gauge, and about 3/4 on the gauge. Fan turned on around the 3/4 mark, which, on the gauge face, seemed close to the red/ overheat area. That freaked people out, even though that was within spec, so they installed manual fan switches to turn the fan on over the 1/2 mark.

For '96-02, the gauge was recalibrated. 1/2 on the old gauges was now 3/8 on the new gauges. 3/4 on the old gauges now showed as 1/2 on the newer gauges, even though the actual coolant temp was the same in both cases. Less panicky owners
Keep in mind also that the only place the gauges are close is near the 1/2 way point. Based on what I've seen with the '95 and earlier cars, some of the panic is probably due to not understanding that the gauge sweep is completely different. 1/4 on the pre '96 cars is around 180 degrees, and 1/2 is 208-210 IIRC. The same range sweep on the later cars is around 60-65 degrees temp change, as compared to 25-30 degrees temp change on the earlier cars.

The same applies on the earlier cars from the 1/2 point to the 3/4 point. That movement is only 20-25 degrees actual temp change.

Those combined with the ECTS variations, gauge variations, and higher fan on temp of the earlier cars have some early cars pegging the red before the fan kicks on.

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