Functional Test - Heater - Without A/C

Before beginning the functional test of the heater system the vehicle should be idling with the coolant hot and the thermostat open. Coolant temperature should be 90°C (194°F). Even if a problem is found during any intermediate step of the functional test, the test should be completed before repair is started.

Remarks:

A. Engagement of detent must be felt in each mode.
B. Noticeable blower speed increase must occur from low to Med 1, Med 2 and high.
C. Listen for changes of air noise due to recirculation door closing.