1993 Jeep Cherokee HEATER SYSTEM

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Filed Under (Jeep) by admin on 15-06-2010

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DESCRIPTION Cherokee and Wrangler use a blend-air heater system. Temperature of air entering passenger compartment is controlled by regulating amount of airflow through heater core and then blending it with a controlled amount of cool air that by-passes the heater core. OPERATION CHEROKEE Mode Control Lever The upper control lever on the control panel operates a vacuum switch on back of control panel. Vacuum switch controls vacuum to defroster, floor and panel vacuum motors, as well as a vacuum- actuated heater coolant control valve. See Figs. 1 and 4. The heater coolant control valve closes when vacuum is applied to it. Temperature Control Lever The lower control lever on the control panel moves a cable that controls the position of the blend-air door in the heater case.

1989 Toyota MR2 AIR CONDITIONING TROUBLE SHOOTING

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Filed Under (Toyota) by admin on 14-06-2010

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ù Compressor clutch circuit open. Compressor Not Working ù Compressor clutch coil inoperative. ù Poor clutch ground connection. ù Fan belts loose. ù Thermostatic switch inoperative. ù Thermostatic switch not adjusted. ù Ambient temperature switch open. ù Superheat fuse blown. Insufficient or No Cooling; ù Compressor Working Expansion valve inoperative. ù Heater control valve stuck open. ù Low system pressure. ù Blocked condenser fins. ù Blocked evaporator fins. ù Vacuum system leak. ù Vacuum motors inoperative. ù Control cables improperly adjusted. ù Restricted air inlet.