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1995 Saturn SL1 Cooling fan


351mach11647545510

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My moms 95 Saturn SL1's cooling fan wont kick on, causing the car to overheat. I jumped the fan to the battery and it works, the relay is fine (swapped places with an identical one). What else is in the cooling fans system? know where i can find a wiring diagram? The coolant temp sensor, according to the gauge, is working accurately.
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The coolant temp sensor, according to the gauge, is working accurately.

 

There are two separate coolant temp sensors on those cars. One for the gauge and one for the computer/fan. On the drivers side of the head the one with 1 wire is for the gauge, the sensor with 2 wires is for the computer/fan. A lot of time they crack and then leak into the connector. Make sure the connector isn't corroded. Probably needs a sensor and connector.

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There are two separate coolant temp sensors on those cars. One for the gauge and one for the computer/fan. On the drivers side of the head the one with 1 wire is for the gauge, the sensor with 2 wires is for the computer/fan. A lot of time they crack and then leak into the connector. Make sure the connector isn't corroded. Probably needs a sensor and connector.

 

was going to post this, a lot of those had 2 sensors, so this is very likely, Need a scan tool to see what the computer sees, and to see if its commanding it on, pretty hard without a scan tool, but you could throw a sensor on it and see.

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My wife's 99 Saturn had one sensor with 2 leads (ECU and gauge). Hers went bad causing the fan to stop kicking on but displayed the temperature fine. If its a single sensor car, you just need a new sensor.

 

Turn on your AC. If the fan runs, the sender is bad. Also, if her fuel mileage has been shitty is a good indicator.

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was going to post this, a lot of those had 2 sensors, so this is very likely, Need a scan tool to see what the computer sees, and to see if its commanding it on, pretty hard without a scan tool, but you could throw a sensor on it and see.

didnt know you could do that with obd1?

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obd1 gm reads out pretty close to obd2 it just uses a different connector

 

I have an old snap on brick scanner if you want to stop by and scan it sometime

 

I have one too but it isn't throwing any codes. Went to put a new coolant temp sensor and connector in and the damn sensor snapped, didn't even get snug. Cut the pig tail and jumped it for the time being till I have more time to deal with it and it kicks the fan on while the car is on.

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