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HEATER AND A/C PERFORMANCE TESTS HEATER OUTPUT TEST PRE-DIAGNOSTIC PREPARATIONS Review Safety Precautions and Warnings before performing the following procedures. Check the radiator coolant level, drive belt tension, and engine vacuum line connections. Also check ra- WARNING: DO NOT REMOVE RADIATOR CAP WHEN ENGINE IS HOT, PERSONAL INJURY CAN If vehicle has been run recently, wait 15 minutes before removing cap. Place a rag over the cap and MAXIMUM HEATER OUTPUT: TEST AND Engine coolant is provided to the heater system by two 16 mm (5/8 inch inside diameter) heater hoses. If the floor outlet air temperature is low, refer to Group 7, Cooling System for coolant temperature POSSIBLE LOCATIONS OR CAUSE OF OBSTRUCTED (a) Pinched or kinked heater hoses. (c) Plugged heater hoses or supply and return ports at cooling system connections, refer to Group (d) Plugged heater core. If proper coolant flow through heater system is ver- ified and outlet air temperature is still low, a me- POSSIBLE LOCATION OR CAUSE OF INSUFFICIENT HEAT (a) Obstructed cowl air intake. TEMPERATURE CONTROL If temperature cannot be adjusted with the TEMP lever on the control panel, or TEMP lever is difficult (a) Blend-air door binding. or disconnected. (c) Improper engine coolant temperature. A/C PERFORMANCE TEST The air conditioning system is designed to remove heat and humidity from the air entering the passen- PERFORMANCE TEST PROCEDURE Review Safety Precautions and Warnings before proceeding with this procedure. Air temperature in (1) Connect a tachometer and manifold gauge set. A/C, temperature lever on full cool and blower on (3) Start engine and hold at 1000 rpm with A/C clutch engaged. (4) Engine should be warmed up with doors and windows closed. TEMPERATURE REFERENCE CHART 24 - 6 HEATING AND AIR CONDITIONING Ä |