[SoCal LS-L]

Looking from the drivers side, under the hood, its the sensor directly below where the throttle body connects to the intake manifold. It has 2 wires coming out of it. If you want more detail on location/testing, and diagnosing your problem.... download the SVX service manual, the link is directly below in my signature. It includes flow charts to help eliminate the most likely causes in a step by step procedure.

Luckily ther coolant temp sensor is easy to test (with a multimeter) and relatively inexpensive. Dont forget to download the service manual...its indespensible for anyone who does their own work. Good luck!