Started getting this code at beginning of Winter once temp dropped to 35 degrees F and below. It is only intermittent, staying on for only 1 or 2 days. Will return after 2 to 6 weeks of driving. No code can be scanned when light is out. I was lucky enough to have the danged light come on as I was approaching an Autozone. They pulled a code (can't remember the code), but the dude said it was a fault in the Water Temperature Sending Unit. I've purchased a new unit (just about crapped when I priced a $10 gallon of antifreeze today!) but have not installed yet.

My water temp (me thinks) runs a little cool. In summer never, ever gets above 200 degrees F, but this Winter she sits on about 170-175 degrees F with temps below 30 degrees F.

Here comes my ignorance....................

Is that the temp sensor I see on the driver front side of the engine (close as heck to the exhaust manifold outlet), or is there another location........ like on the radiator?

Gotta get me a manual. Thanks

The ECT (engine coolant temperature) sensor is located directly below the t-stat. It points down at an angle.

The proceedure for replacing the ECT sensor is as follows:

1. Drain coolant level down below that of the ECT sensor
2. Disconnect the wiring
3. Remove the ECT sensor
4. Coat the threads of the replacement ECT sensor with sealant (anything that is rated for cooling system use)
5. Reinstall ECT sensor and torque to 15 ft-lbs (20N.m)
6. Refill coolant system

I should add that I am not sure of the location of the ECT sensor on S2 L36 engines, only on the S2 L67.

Thanks swartlkk.

That sensor IS just below the thermostat housing. Makes sense to me.