Removal and Installation

Drain the engine coolant.

Fig 1: Disconnecting Heater Hoses From The Heater Core
Courtesy of MAZDA MOTORS CORP.
Disconnect the heater hoses from the heater core.
Remove the instrument panel. For additional information, refer to INSTRUMENT PANEL .
If equipped with A/C remove the A/C evaporator core housing. For additional information, refer to EVAPORATOR CORE HOUSING .

Fig 2: Removing/Installing Heater Core Housing
Courtesy of MAZDA MOTORS CORP.
Remove the heater core housing.
1. Remove the heater core housing retaining nuts.
2. Carefully remove the heater core housing to avoid spilling engine coolant in the passenger area.
To install, reverse the removal procedure.