Question about 1998 GMC Jimmy

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Got heater core need to put it in,want to now how to do it the right and fastest way

How exactly do you change heater core in 89 gmc jimmy

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In order to replace a heater core in a 1998 gmc jimmy the coolant must be completely drained and the entire dash including radio, vents and panel covers must be removed. four screws hold the top portion(closest to the windsheild) in place. they can be found under the windshield defrost vent. after the entire dash is removed a safety harness under the steering column must be removed and the steering column must be dropped to the driver seat. The heater core housing(black plastic) is located right center of the dash and is a two part housing one piece on top of the other. the housing is attached to the fire wall and must detached before replacement can continue. after detaching the housing from the fire wall separate the housing by unscrewing the six screws that hold it together. the heater core is now exposed. disconnect the heater core from the two hoses and discard. installation is the un installation process in reverse.
Good luck, it is a very long and drawn out process that is not accomplished in just an hour or two . make sure you have most of the day or several afternoons to finish . i started this and it took me 2 afternoons to take apart and put back together 

Posted on May 29, 2009

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disconnect negative battery cable
remove coolant reservoir
dis-connect heater hoses at heater core
remove mounting screws and nuts from the heater housing in the engine compartment
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disconnect heater controls ( be sure to lable them so you know where to put them later )
disconnect the computer ( ECM ) an mounting bracket
remove the radio antenna cable
remove the kick pannel and detech the right lower corner of the dash pannel.
pull the heater assembly to the rear for access and dis-connect the wiring harness
remove the screws and nuts retaining the heater housing inside the cab
remove the heater housing from the vehicle
detach the core retaining straps
and wala you got it
to install it just reverse these steps.
good luck

Jun 16, 2008 | 1988 GMC S-15

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