FINAL TEST COOLANT HEATER Continued
Turn the heater on and run it until the coolant is hot enough to make the heater cycle from high to low heat. Leave the
heater alone, then take the temperature of the coolant. The temperature should be between 140
C) and 170
C). If coolant temperature is not within limits, replace restriction thermostat (WP 0079 00).
After testing the restriction thermostat, close circuit across terminal board terminals No. 4 and No. 5, to make the heater
stay on high heat. Heat the coolant until the heater burning stops. Check the temperature of the coolant, it should be not
less than 220
C) or more than 250
C). If the coolant temperature is not within these limits, replace the
overheat thermostat (WP 0080 00).
Install coolant heater in carrier (see your -20).
END OF TASK
0077 00-7/8 blank