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Cooling System Troubleshooting

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Cooling System Troubleshooting

Old 03-16-2019, 02:06 PM
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Cooling System Troubleshooting

Hey ThirdGen'ers!

While idling, I noticed that the Temp Gauge went up past the 220 mark but no Cooling fan. When the car reached the 3rd line, before the red zone I shut her off. There was no gurgling or boil over in the overflow tank, physical radiator was just reaching luke warm to the touch at best, and I could hold the upper rad hose bare handed. Grabbed the GMSM, used a fused jumper wire between the RED wire & BLK/RED wire terminals on the Fan Relay connector, fan came on instantly. Two questions...

1. If the Temp Sensor for the gauge is shot, can it show a false overheating condition and the motor not really be at operating temp to activate the fan switch? If it's wire from the connector is resting on a spark plug wire will it cause resistance issues leading to a false reading?

2. If anyone has ever changed a Radiator Fan Switch on a 92 or similar w/ 305 TBI how did you access it? Tried from below, but there were to many obstacles... Couldn't even reach the connector to disconnect it to attempt grounding it for further troubleshooting...

Last edited by 92RS-HeritageEd; 03-16-2019 at 04:13 PM.
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Old 03-17-2019, 12:54 AM
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Re: Cooling System Troubleshooting

on q1. part a - sensor is unlikely to fail safe. in other words, unpredictable. q1 part b, remove off wire and find out. but i would doubt it. most sensors operate over a voltage range that is converted to a reading. spark plug wire would cause a frequency reading issue if anything
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Old 03-17-2019, 06:53 AM
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Re: Cooling System Troubleshooting

My buddy has a 92 Z and his acts the same way. the fan does not come on until 240! The Other fan only comes on when he turns on the AC. GM programmed these cars to kick that fan on @ 235. I believe. His car does get hot, his gauge is accurate. I really don't know how that thing has not blown a gasket by now.

When I was having issues with my cooling system I purchased, for $5 on sale @ HF a inferred temp sensor, one of the laser ones. You can use it to get the temps of the head, rad hoses and the radiator itself. This will tell you if your temp gauge is working or not. That gauge may just be your only problem.
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Old 03-18-2019, 09:02 PM
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Re: Cooling System Troubleshooting

Anyone know how to remove the connector from the Fan Switch? It *looks* like a push-on connector BUT it did not simply pull-off and I do not want to damage it.
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Old 03-18-2019, 09:04 PM
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Re: Cooling System Troubleshooting

If itís the factory connector squeeze and pull. The connector gets brittle with heat. If you need a new one hereís a link.
https://www.ebay.com/itm/Knock-KS-De...AAAOSwd9Za6d2k

Last edited by Tuned Performance; 03-18-2019 at 09:07 PM.
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Old 03-18-2019, 09:52 PM
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Re: Cooling System Troubleshooting

clean it off and put a strong light on it. you will see how it is anchored and what you need to do
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Old 03-21-2019, 07:34 PM
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Re: Cooling System Troubleshooting

Originally Posted by Tuned Performance View Post
If itís the factory connector squeeze and pull. The connector gets brittle with heat. If you need a new one hereís a link.
https://www.ebay.com/itm/Knock-KS-De...AAAOSwd9Za6d2k
Finally got around to removing the connector, lt was the OEM connector and thanks to your instruction (as always) and LiquidBlue's suggestion of a shop light I actually got the connector off. Of course the plastic was brittle and had a chip in it but all-in-all it seems reusable. Next chance I get i'll slap the battery in it and ground the connector for testing. Hopefully the fan kicks on, then my issue will be a $9 fan switch vs a priceless wiring issue.
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Old 03-23-2019, 04:52 PM
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Re: Cooling System Troubleshooting

RESOLVED: Found out by moving the temp gauge sensor wire off of the #1 sp wire... gauge works as normal, a bonus is my cooling fan did come on in line w/ the correct gauge reading of just past the 220 mark!
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