13 2 HEATER MID DEFIIDSTEII VI SQREW HN IIEATEII MII IIEFRUSTEII UPEMTIDII cowmon TUBE SWITCH The heater is part of the engine cooling system and Q vacuum depends on normal engine operating temperature and TUBE gg T g airflow through the cowl fresh air intake to heat the interior of the vehicle During heater operation close the fresh air vents l O y if ca mam l 3 gx oemosr K The air control knob operates a door in the fresh air was V T V Q gi Q intake duct which controls the amount of air entering l O C 5 vb f the heater housing When the knob is pushed in no a r air will enter the passenger compartment As the knob TEMP is ulled out the door o ens allowin more airflow cournoi b J P P g CABLE EMPERA OFF HEAT unt1l the maximum flow is reached when the knob is CUP CONTRDLTURE 42535 pulled completely out The air control knob must be at W T H least partially out to operate the heater The temperature control knob operates the Blend Hu 13 2 Hum ml Immun l E wwmur TMR Air door in the heater housing fig 13 3 At the full out position all air is directed through the heater The fan control is a four position control switch core providing maximum heat flow At the full in OFF LOW MEDIUM and HIGH which regulates position all air is directed around the heater core pro the blower motor and airflow for heat defrost and viding unheated fresh aire Any in between position of fresh air ventilation the control allows a blend of cool fresh outside air WSE 5 AIR uc r mw aAcxsr M y zgtgirie g L X cLAMr 3 aMv utf WSE g W c AMv V 4 A I ss FAN cumv g if X fQ mam l I wi nose 7 I I y ev T c AMe a 3Jj if jh d SEAL i i V A 04 ossnosrzn f Mazza 2 V susnma V smwsn moron Vc l ozsnosren WSE mm Fly I3 3 Ikmr and II Ir sI r CJ IMM