The Coolant sensor that is a Bear to get at, is on the back side of the head, between the firewall and engine. If left unplugged, the transmission Will Not go into 4th Gear or Overdrive. Looking into the engine bay, look between the Alternator Bracket and Head. This is just under the Fiberglass Intake Manifold. Don\'t even try and get to it from the top side. You will find it hidden in a sort of Cubby Hole, when looking from under the car. My guess is that yours didn\'t get plugged back in after head replacement. The easy one to get at is simple. We just assume you are looking for the Hidden one. We had all sorts of Transmission and Coolant Sensor Codes. Best of luck to you.
From Wade ....
SOURCE: coolant fan temp sensor location on a 2003 chevy venture
located in thermostat housing or in intake nearby (where top hose connects from radiator to engine)
SOURCE: need to replace the coolant sensor on a 2008 chevy equinox
One should be around the thermostat and one (if you have one) on the radiator
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