TM 9-2350-277-20-1COOLANT HEATER MALFUNCTIONS—Continued 0089 004Y1. Does HEATER ON indicator come on in less than 3 minutes?YESNOGO TO GY (PAGE 0089 00-9)5Y1. Turn HEATER SWITCH to ON. Do not stop at OFF position.2. Do blower and pump stay ON?YESNO5YN1. Replace heater ON/OFF/STARTswitch. See task: Repair heatercontrol box (WP 0737 00).2. Verify no faults found.6Y1. Feel exhaust temperature.2. Does heater continue to produce hot air for 10 minutes?YESNO6YN1. Shut off heater (see your -10).2. Replace heater (WP 0728 00).3. Verify no faults found.7YNOTEHeater will shut off prematurely if air inlet temperature is60 degrees or above. This is normal.1. Run heater on HI for 10 minutes.2. Does heater continue producing hot air?YESNO7YN1. Shut off heater (see your -10).2. Replace heater (WP 0728 00).3. Verify no faults found.8Y1. Turn HEATER SWITCH to OFF.2. Does blower remain on?YESNO8YN1. Heater does not purge.2. Replace heater (WP 0728 00).3. Verify no faults found.9Y1. Listen to heater until coolant pump and blower shut off.2. Do coolant pump and blower shut off in less than 5 minutes?YESNO9YN1. Faulty heater flame detector switch.2. Replace flame detector switch(WP 0734 00).3. Verify no faults found.0089 00-2
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