C10(2) REMOVE AND REPLACE (R&R)
Meets NATEF Task: A7-C-10. Remove, inspect, and reinstall heater core. (P-3)
Make/Model: Year: Instructor’s OK:
Note: This procedure varies greatly between different vehicles. Major differences are how the
heater core is mounted in the HVAC case and how the HVAC case is mounted in the vehicle. In
some vehicles, the HVAC case is cut open.
_____1. Locate the manufacturer’s recommended procedure for heater core replacement on this
Information source: , Section: , Page:
_____2. Indicate the operations that must be done to complete this job.
Drain coolant _____
Disconnect & reconnect heater hoses _____
Recover refrigerant _____
Disconnect & reconnect A/C lines _____
R & R HVAC case _____
R & R instrument panel _____
R & R center console _____
Disassemble HVAC case _____
R & R HVAC case/Heater Core seals _____
Bleed heater core _____
Recharge A/C system _____
_____3. Drain the coolant to a level below the heater hose connections, and disconnect the heater
hoses from the heater core.
Tip: If the coolant is dirty, drain and flush the cooling system before installing the new
core. Splice the heater hoses together during flushing so dirt and other contaminants can
be cleaned out of them.
_____4. Perform the necessary operations to gain access to the core, and remove the old heater
_____5. Install the new heater core. Check any seals to insure they are in good condition and
OK _________ NOT OK _________
_____6. Reconnect the heater hoses, and fill the system with coolant.
Tip: It is recommended to drain and replace the coolant at this time.
_____7. If possible, determine the cause of failure of the old core.
Leaking solder joint _____
Note: The last three causes of failure can be the result of bad, worn out coolant.
_____8. Was a special procedure needed to bleed air from the core.
Yes _________ NO _________
If yes, briefly describe the procedure:
_____9. What was the flat rate time for this job? Hours