Coolant Senor (Code 15)

I just experienced some probelms with my car today. A weird smell filled the car and hten the car was about to shut off. Then didn't and then the service engine soon light came on and then the smell went away. So I went home and checked the ECM. Code 15 came up. I pulled out the Haynes Repair book and the picture they showed in the book doesn't really show me where it is. Does anyone know exactly where it is in a 1989 Pontiac Grand Prix SE. 2.8 Liter engine.

the sensor is located on the thermastat housing