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901301 REV D 10/27/14, SLIMLINE HC PG 11 OF 12
ADJUSTABLE
KNOB
CAPILLARY
TUBE
TO
EVAPORATOR
COIL
COLDER
CLOCKWISE
COUNTERCLOCKWISE
WARMER
THERMOSTAT ADJUSTMENT
AIR CONDITIONING ADJUSTMENTS:
ADJUSTING A/C THERMOSTAT:
THE AIR CONDITIONER THERMOSTAT CONTROLS COIL TEMPERATURE. THERMOSTATS ARE SHIPPED ADJUSTED
FULLY COLD (CLOCKWISE). IN THE MAJORITY OF CASES, THE A/C WILL OPERATE CORRECTLY AS SHIPPED.
TURNING THE KNOB TO THE RIGHT (CLOCKWISE) MAKES THE SYSTEM OPERATE COLDER. IF THE THERMOSTAT
IS SET TOO COLD, THE EVAPORATOR COIL WILL "ICE UP," MEANING THE EVAPORATOR COIL IS RESTRICTED
WITH ICE, AND COLD AIR FLOW WILL BE REDUCED.
TURNING THE KNOB TO THE LEFT (COUNTERCLOCKWISE) MAKES THE SYSTEM OPERATE WARMER. THE
COMPRESSOR CLUTCH WILL CYCLE OFF FREQUENTLY. THE EVAPORATOR COIL WILL NOT GET AS COLD AND
THE AIR TEMPERATURE WILL NOT BE AS COLD.
1.)
SYMPTOM:
THE A/C WORKS WELL AT FIRST, THEN QUITS COOLING. THE AIRFLOW FROM THE VENTS IS LOW,
AND THE COMPRESSOR CLUTCH CYCLES INFRQUENTLY.
SOLUTION:
THE THERMOSTAT IS SET TOO COLD AND THE EVAPORATOR IS "ICING UP" AND RESTRICTING
AIRFLOW.
ALLOW THE ICE TO MELT
AND SET THE THERMOSTAT WARMER (COUNTERCLOCKWISE) 1/8 OF A
TURN EACH ADJUSTMENT UNTIL THE SYMPTOMS DIMINISH.
2.)
SYMPTOM:
A/C NEVER GETS COLD AND THE COMPRESSOR CLUTCH CYCLES FREQUENTLY.
SOLUTION:
THE THERMOSTAT IS TOO WARM. SET THE THERMOSTAT COLDER (CLOCKWISE) 1/8 OF A TURN
EACH ADJUSTMENT, UNTIL THE DESIRED AIR TEMPERATURE IS REACHED.
AVOID SETTING THE THERMOSTAT
TOO COLD.
3.)
SYMPTOM:
THE A/C NEVER GETS COLD, SOMETIMES EVEN BLOWS HOT, AND THE A/C COMPRESSOR CLUTCH
INFREQUENTLY CYCLES OFF.
SOLUTION:
THE HEATER MAY BE ON AT ALL TIMES.
CAREFULLY
FEEL THE HEATER HOSE BETWEEN THE
EVAPORATOR
AND THE
HEATER CONTROL VALVE
. THIS HOSE SHOULD NOT BE HOT IN THE
A/C MODE.
IF
THE HOSES ARE HOT....
A)- THE HEATER CONTROL VALVE MAY BE INSTALLED BACKWARDS. CHECK THE FLOW DIRECTION ARROW ON
THE VALVE AGAINST THE ILLUSTRATION IN YOUR INSTALLATION INSTRUCTIONS.
B)- IF CABLE OPERATED: THE VALVE MAY BE MISADJUSTED.
C)- IF VACUUM OPERATED: IT MAY BE GETTING VACUUM AT ALL TIMES (CHECK ELECTRIC SOLENOID).
D)- THE HEATER CONTROL VALVE MAY BE INSTALLED IN THE WRONG HOSE. IT MUST BE INSTALLED IN THE
HOSE COMING FROM THE INTAKE MANIFOLD ENGINE COOLANT
PRESSURE PORT.
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