SOURCE: coolant temperature sensor on a saturn 2002 sl1. where is it loca
The coolant temp sensor is on the driver's side of the engine in the head. If you remove the lid to the airbox and lift the intake tube, you will be able to reach it easily. To remove the connector, you just squeeze it. Then use a socket or a wrench to remove the coolant temp sensor. You will lose some coolant so be ready with the new one or drain the antifreeze before you start.
SOURCE: replacement of coolant temperature sensor
located under intake in water crossover pipe,you can access the sensor by removing intake chamber box,then pcv hose connected to the block,the connector is orangeish 2pin,use a 19mmdeep socket on a 3/8 ratchet to get it loose,make sure engine is cool,also make sure there is a new brass washer with your new sensor,sometimes the old washer comes off when removing the sensor,sometimes it sticks to the pipe,some coolant will escape so make sure to top it off
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