AutoZone Product & HowTo Info | Q | Crankshaft Position Sensor

Search suggestions

    My Vehicles

    1994 Mazda Truck MPV 4WD 3.0L MFI 6cyl

    My Store

    405 N COLLEGE ST
    (479) 443-4043

    OPEN 'til 10:00 PM today


    Use Code: SEECLEAR

    See Details

    Heater Core


    If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.

    When a heater core leaks, a new heater core is installed or the old one repaired.

    Heater Housing

    • The heater housing is usually under the dash and must be removed to gain access to the heater core.
    • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
    The heater housing is disassembled to get to the heater core.

    Heater Core

    • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
    • Remove the heater coolant hoses.
    • Remove the cable and/or vacuum control lines (if equipped).
    • Remove the heater core securing brackets and/or clamps.
    • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
    • To reinstall the heater core, reverse the removal steps.

    When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

    AutoZone Logo