For 1990-2009 cars only
The most likely cause of excessive heat from the heater system is an improperly indexed temperature control cable. Other related causes include the following conditions:
| • | A slipping self-adjusting clip at the temperature control cable end |
| • | A loose control cable sheath retainer or bracket at the bottom of the heater assembly |
| • | A binding or obstructed temperature air valve |
A hot air leak from the engine compartment to the blower inlet is also a remote possibility.
