Functional Test - Without A/C

Heater Control Assembly:

Vacuum Schematic:

Heater Function Test:

FUNCTIONAL TEST

Before beginning the functional test of the heater system, the engine must be idling with the coolant hot and thermostat open. Coolant temperature must be about 90°C (194°F). During the function test, evaluate the operating efforts of the mode control knob and the temperature control knob. Even if a problem is found during any intermediate step of the function test, the test should be completed before repair is started (refer to accompanying figures).

REMARKS

A. NOTICEABLE BLOWER SPEED INCREASE MUST OCCUR FROM LOW THRU HI

B. ENGAGEMENT OF DETENT MUST BE FELT IN EACH MODE.

C. CHECK FOR AIR AT SIDE WINDOW DEFOG OUTLETS.