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Change heater core in 1999 madza truck? need to know how?

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(1)Disarm the airbag system;
(2)allow the cooling system to completely cool down;
(3)using a thick cloth for protection, turn the radiator filler cap to the first stop;
(4)step back and let the pressure release;
(5)once the pressure has been released, completely drain the cooling system;
(6) working within the engine compartment, loosen the ****,ps on the heater hoses at the engine compartment side of the firewall, twist the hoses and carefully sepseparate them from the heater core tubes;
(7)plug or cap the heater core tubes to prevent coolant from spilling into the passenger compartment when the heater core is removed;
(8)place a plastic sheet on the floor of the vehicle to prevent stains if the coolant spills;
(9)remove the instrument panel;
(10)remove the PCM heat sink and ground strap;
(11)remove the heater plenum chamber;
(12)separate the heater core from the heater plenum chamber; (13)installation is the reverse of the removal with the following additions; (a)fill the cooling system; (b)run the engine, check for leaks and test the heater.

Posted on Nov 13, 2009


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Posted on Jan 02, 2017


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