I am trying to find a diagram or pictures of where things are located at on 91 bonneville 3800 engine. I am looking for the coolant sensor location and the temperture switch location.

If you need pictures let us know

The Coolant Temperature Sensor is located: Under hood, driver side, upper engine area, front of rear valve cover, below air intake manifold, mounted in intake manfold

The Temperature Switch is located:Under hood, center, upper engine area, rear of throttle unit, below valve cover end, mounted in driver side of engine block

info via, autozone repair info

And there is a coolant level sensor in the radiator passenger side about halfway down in the plastic of the end tank.

ok I believe I found the coolant sensor, on the block, pain to get to, but have yet to find the temp switch, may need a pic, thank you for the help

unless that is the switch in the block and i put a sensor in its place