Question about 1999 Saturn SL

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1998 Saturn I need to know where the coolant sensor is located?

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Are youy referring to the coolant level sensor, or the coolant temperature sensor. The level sensor is built into the resevoir bottle and can only be serviced by replacing the entire reservoir. The temperature sensor is locate on the cylinder head on the right side of the engine (standing in front of the car, facing the engine. AKA the drivers side.) It is below the upper radiator hose toward the bottom of the head. There is a small two wire connector that plugs into it.

Posted on Feb 03, 2009

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check coolant temp sensor located at driver side end of cyl head. remove sensor and check or cracks. also check connector for corrosion. if cracked, go to dealer for replacment. they eill sell you a new designed metal sensor to replace your cracked plastic one. dont buy aftermarket, they will not be accurate. cracked sensor will cause eng. to run rich. may start ok cold but not when hot.

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