Excessive Heat Diagnosis

CHECKS DESCRIPTION
The most likely cause of excessive heat from the heater system is an out of adjustment temperature control cable. Other related causes of excessive heat include a slipping self adjusting clip at the temperature control cable, end loose control cable sheath retainer or bracket at the bottom of the heater assembly or binding or obstructed temperature air valve. A hot air leak from the engine compartment to the blower inlet is a remote possibility.