WP failure (does it blow hot air from the vents?), thermostat stuck on closed, radiator fan or resistor not working, radiator plugged, Coolant temp gauge sender.
Edit. Test coolant temperature gauge sender. Per Haynes, if temp. gauge in dash reads hot after engine is started from cold, disconnect sender�s electronic connectors. If the gauge reading drops, replace sender.
Here is a post from Chongo. It highlights the ECT sensor.
The coolant temp gauge sender is the bronze (??) looking thing below the "Co" from the word coolant.
Originally posted by chongo:
Did someone call me out.......LOL
here you go.