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RESOLVED: 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... |
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 |
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. :burnout: |
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. |
Re: Cooling System Troubleshooting If it’s the factory connector squeeze and pull. The connector gets brittle with heat. If you need a new one here’s a link. https://www.ebay.com/itm/Knock-KS-De...AAAOSwd9Za6d2k |
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 |
Re: Cooling System Troubleshooting
Originally Posted by Tuned Performance
(Post 6288981)
If it’s the factory connector squeeze and pull. The connector gets brittle with heat. If you need a new one here’s a link. https://www.ebay.com/itm/Knock-KS-De...AAAOSwd9Za6d2k |
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! |
Re: RESOLVED: Cooling System Troubleshooting Is there somewhere on the forum some photos of the different sensors/switches from the cooling system ? I read a few topics about that but even if I'm starting to be familiar with the different elements of the system, I still don't know how they look like and where they are located on the engine. I know where is the fuse box but it's almost the only thing I'm sure. I don't know exactly where is the relay (someone told me, I didn't have time to check right now), I don't know where is the fan switch or the sensor (sender) for the gage. I think this is the fan switch and I'm supposing that in my case (similar to 92RS' case) it is faulty but I have to be sure that I'm looking at the right part and I must find a way to test it. https://cimg0.ibsrv.net/gimg/www.thi...986b797de8.jpg https://cimg8.ibsrv.net/gimg/www.thi...d4003cedc0.jpg |
Re: RESOLVED: Cooling System Troubleshooting
Originally Posted by Flat-twin
(Post 6303936)
Is there somewhere on the forum some photos of the different sensors/switches from the cooling system ? I read a few topics about that but even if I'm starting to be familiar with the different elements of the system, I still don't know how they look like and where they are located on the engine. I know where is the fuse box but it's almost the only thing I'm sure. I don't know exactly where is the relay (someone told me, I didn't have time to check right now), I don't know where is the fan switch or the sensor (sender) for the gage. I think this is the fan switch and I'm supposing that in my case (similar to 92RS' case) it is faulty but I have to be sure that I'm looking at the right part and I must find a way to test it. https://cimg0.ibsrv.net/gimg/www.thi...986b797de8.jpg https://cimg8.ibsrv.net/gimg/www.thi...d4003cedc0.jpg https://cimg5.ibsrv.net/gimg/www.thi...de0cf90861.jpg behind ESC Module thing in that bracket |
Re: RESOLVED: Cooling System Troubleshooting Thanks for the relay pic :) Do you know where is that fan switch please ? I think that I located the sensor on driver's side head but I can't find the switch. |
Re: RESOLVED: Cooling System Troubleshooting
Originally Posted by Flat-twin
(Post 6303978)
Thanks for the relay pic :) Do you know where is that fan switch please ? I think that I located the sensor on driver's side head but I can't find the switch. |
Re: RESOLVED: Cooling System Troubleshooting I thought it was the contrary (sender on drivers side and FS on passenger side). And sorry about the next silly question but SP means ? (I'm not used to English initialisms yet). |
Re: RESOLVED: Cooling System Troubleshooting temp gauge "dash" is on driver's side, fan switch is on passenger side between 6-8 cyl near the manifold, the lower one is the knock sensor don't get these confused they look very similar |
Re: RESOLVED: Cooling System Troubleshooting
Originally Posted by Flat-twin
(Post 6304005)
I thought it was the contrary (sender on drivers side and FS on passenger side). And sorry about the next silly question but SP means ? (I'm not used to English initialisms yet). |
Re: RESOLVED: Cooling System Troubleshooting By the way, is there somewhere I can find the OEM part number in order to find replacements ? When I was working on my BMW we had something called RealOEM which allowed to find a part number based on schematics after entering the VIN (which would make sure the part fits the model, even if you have specific options). Is there something similar for the 3rd gens ? |
Re: RESOLVED: Cooling System Troubleshooting You can figure it out from Rock auto usually. Or you have to look in the GM parts book, someone made a CD for it, a long time ago, and you could use it on your PC |
Re: RESOLVED: Cooling System Troubleshooting
Originally Posted by Flat-twin
(Post 6303936)
I think this is the fan switch https://cimg0.ibsrv.net/gimg/www.thi...986b797de8.jpg |
Re: RESOLVED: Cooling System Troubleshooting
Originally Posted by scooter
(Post 6310265)
You can figure it out from Rock auto usually. Or you have to look in the GM parts book, someone made a CD for it, a long time ago, and you could use it on your PC
Originally Posted by deadbird
(Post 6310328)
That is the Fan A/C pressure switch. For a TPI and v6 car, if the a/c works, it causes the ECM to trigger the fan(s, year depending) when you turn on the a/c. On a TBI engine, it is a redundant ground to the fan relay (it isn't needed). The a/c high pressure cutoff switch is mounted on the back of the a/c compressor. |
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