Mechanics

WHAT SENSOR TELLS THE ENGINE COOLING FANS TO KICK ON, OR SHOULD I SAY WHAT SENSOR TELLS THE PCM TO TRIP THE RELAYS ON A 3.4 LTR ENGINE?

2008 Chevrolet Equinox • 68,000 miles

Both fans not running, gauge on dash in red, not steaming, no bells, lights or whistles. I tested the relays and they are fine.
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Schlaters
September 6, 2011.



The engine coolant temperature sensor

Rasmataz
Sep 6, 2011.