If you have EATC (Electronic automatic temperature control) can do a self-test by pressing the OFF and FLOOR buttons simultaneously and then press the AUTOMATIC button within two seconds. The display will show a pulse tracer going around the center of the display window. The test may run as long as 30 seconds. Record all DTCs displayed.
If you don't have EATC you should check primarily your coolant level, if engine is overheating, plugged or parrtially plugged heater core, temperature blend door binding/stuck, A/C electric blend door actuator.
IT's stupid but i don't know how to post pictures in the forum, tell me how and i'll be able to give you the pinpoint test and electrical schemas
Thanks
Nic.
