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Home >> Jeep >> 1990 >> Wrangler Base, 4.2 T, Standard >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater System >> Heater System OPREATION Chart

Heater System OPREATION Chart

HEATER SYSTEM OPERATION

MODE LEVER POSITION AIR DISCHARGE BLOWER SPEEDS PANEL DOOR FLOOR DOOR DEFROST DOOR WATER VALVE
Off Closed None Closed Closed Closed Closed
Vent Panel Registers 4 Open Closed Closed Closed
Bi-Level Panel Registers and Floor With Def. Bleed 4 Open Open Bleed Open(1)
Heat Floor With Def. Bleed 4 Closed Open Bleed Open(1)
Def. Defroster 4 Closed Closed Open Open(1)
(1) Water valve closes in full "COOL" temperature lever position.