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© 2012 Mobile Climate Control T-299 Rev. 08/2012
Table 3-4 GENERAL SYSTEM TROUBLESHOOTING PROCEDURES - Continued
3.6 NO EVAPORATOR AIR FLOW OR RESTRICTED AIR FLOW
Air flow through coil blocked Coil frosted over
Dirty coil
Dirty filter assembly
No or partial evaporator air flow Motor running in reverse
Motor(s) defective
Evaporator fan loose or defective
Fan damaged
Dirty filter
Icing of coil
Fan speed relay(s) defective
Fan rotation incorrect
3.7 EXPANSION VALVE MALFUNCTION
Low suction pressure Low refrigerant charge
Ice formation or dirt at block valve orifice
3.8 CONTROL SYSTEM MALFUNCTION
Will not operate/control Circuit breaker or relay defective
Fan speed switch defective
Thermostat defective
Microprocessor controller malfunction (Total Control)
3.9 NO OR INSUFFICIENT HEATING
Insufficient heating Dirty or plugged heater core
Coolant heat valve(s) malfunctioning or plugged
Low coolant level
Hand valve(s) partially closed
W ater pump defective
Auxiliary Heater malfunctioning.
No Heating Hand valve(s) closed
Coolant heat valve(s) malfunctioning or plugged
Pump(s) malfunctioning
Continuous Heating Hand valve(s) defective
Coolant heat valve(s) malfunctioning
Debris under heat valve diaphragm
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