How to replace heater core on 89 s15

This is never an easy job and that is why the labor charges are high for this repair. I know of no place you can get detailed instructions on how to get to the core. You basically remove enough of the dash surround to gain access to the core. Just go slow, take photos or video if necessary to remember how everything fits back in place. If you will search YouTube with the term "heater core replacement 1988 S-15" you may get some help.

May 23, 2011 • 1988 GMC S-15

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I need to remove dashboard in a '89 Lincoln TC to replace h/core

ouch..this is a big job..if you are not familiar with. can do some damage

Dec 18, 2009 • 1989 Lincoln Town Car

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'89 Maxima car heater stops blowing warm/hot air

You will have an 'in' and an 'out' hose going to the heater core. Run engine until hot, these two pipe should be both quite hot, if the out pipe feels cooler than the in pipe then it would seem the core is blocked. You say you have no leaks so maybe it would be worth removing both heater pipes, fix one side up to the water main and gently pass water through it. Hopefully lots of Brown sludge should come out.
If both pipes feel hot then the core should be ok. This means it will be an air-distribution fault and maybe the flap is stuck that changes it from hot to cold air.

Nov 18, 2009 • 1992 Volvo 240

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

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

May 29, 2009 • 1998 GMC Jimmy

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89 s15 jimmy starting troubles

Hello? Get some helpful tips here. Manuals Schematics Comphotechtronics

Jun 24, 2017 • 1989 GMC S-15 Jimmy

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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
remove glove box door and liner
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

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How to replace heater core on 89 s15

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How to replace heater core on 89 s15

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