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How do you open the cover on 1999 jimmy heater core?

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You have to remove the dash panel itself to access the heater box. It's a big labor intensive job.

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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Windows fogging heater core replacement / location


  1. Disconnect the negative battery cable and drain the cooling system.
  2. Disconnect the heater hoses from the heater core inlet and outlet connections in the engine compartment.
  3. Allowing residual coolant from the heater core to drain. Cap the openings.
  4. Working inside the vehicle, remove the lower instrument panel sound insulator and look for where the air blows to your feet.
  5. Remove the heater floor outlet duct screws or clips and remove the duct.
  6. Remove the heater core cover by removing the attaching screws and clips.
  7. Remove the heater core cover.
  8. Remove the heater core retainers and remove the heater core
  9. Reverse order to install leaving the covers off at first then connect all hoses, refill and check for leaks before putting covers back.

Dec 17, 2010 | 1999 Oldsmobile Cutlass

1 Answer

1999 GMC Jimmy, no heat, heater core not plugged, How do I get to the main door dampoer control.


make sure no air lock in heatercore most controls should be be hind glove box i beleve its vacum controled

Oct 06, 2010 | 1999 GMC Jimmy

3 Answers

We just bought a 1999 GMC Jimmy and the heater doesn't work. The fan blows but there is no heat. The air conditioner works fine.


Could be that the heater core is disconnected, there are two hoses that attach to the heather core that come out of the engine, this provides hot water to the core thus making the heater work, when the heater core starts leaking water the quick and fast fix would be to bypass the heater core and connect the two hoses together, check under the hood on the left passenger side there should be two hoses about 1" thick see if there are connected together or of they seem to be connected to 2 outlets that come out of the inside of the vehicle. people do that specially if selling vehicle.

Sep 06, 2010 | 1999 GMC Jimmy

1 Answer

A/c blowing hot air and leaking antifreeze/coolant from heater duct. How do I locate problem?


Your heater core is out or you could have a leaky hose that connects to your heater core. Pain in the **** to get too but not too expensive.

Jul 20, 2010 | 1999 GMC Jimmy

1 Answer

How do you remove a heater core from a 2000 GMC JImmy


2000 GMC Jimmy heater core replacement in order to replace a heater core in a 2000 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 windshield) 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 uninstall process in reverse. 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 . Good luck and take pictures with your cell phone to use as reference.

Nov 27, 2009 | 2000 GMC Jimmy

2 Answers

To remove heater core fromn 1999 jimmy


First go to theengine compartment then mark the hose 1 and 2 one is an in and one is an out.
Then take the hoses off and set them aside becareful if it is hot. then go to the inside of the right passenger side.Then open up theplastic air control unit located under the dash. look up inside of it you should see the heater core.take it out replace it with new one. go to auto zone for best buys.

Nov 05, 2009 | 1999 GMC Jimmy

1 Answer

Heater core replacement


You do not have to do anything with the air conditioning, its all inside car under right side of dash. 1. go under hood and unhook heater hoses and bracket( if equiped) from core tubes. 2. go under dash right side remove 13mm bolt far right under dash thats so you can pull dash out a little ways to get cover off heater where heater core is.3. 1/4 in. socket set and 1/4 in. socket take screws out holding cover on look close there is one hidden top far right can't remember how maney 5 or 6 i think, screws all out use a little finess and remove cover and there will be your heater core. Good luck.

Apr 13, 2009 | 1995 GMC Jimmy

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