Temperature Sensor Test (S & T Models)
- With engine cold and not running, check regulator door. It should be in open snorkel position. Place thermometer inside air cleaner, near sensor.
Courtesy of GENERAL MOTORS CORP.
- With engine temperature less than 80°F (27°C), start engine and run at idle. Regulator door should be in closed snorkel position. When door starts to open, read thermometer in air cleaner. Temperature should be 100-140°F (38-59°C). If door does not begin to open at this temperature, replace sensor.