Question about Chevrolet Blazer

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Hi. Been working on my. 97 Blazer to access heater core. Was told to remove entire dash. i removed the pass and drivers side 10m bolts. Cant find the middle blot. Ps, is this the proper way to access the core? Thanks so much. Frank

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  • vanzee1 Feb 08, 2010

    My heater core in my 97 chevy blazer needs to be replaced. I'm working on it now. I was told to remove the complete dashboard to access it. I removed the passenger side and driver side 10mm bolt. 1)I cannot access the center bolt. 2)Is there a better way of accessing the heater core. Can you please answer number 1 and 2. Thank you.

  • vanzee1 Feb 08, 2010

    Amazing answer!! I'm glad I picked you as the second expert cause the first one gave me one sentence. Thank you for that essay. You're right sir, it is a hater core and not a heater core.

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This is one hard job and most dealers will charge you about 400 - 500 $ plus shop supplies and god knows what else. 1. take the day off and don't drink beer while doing the job, it will take till sun down if you do. 2. you will need some tools such as 6 mm and 7 mm sockets and drive ext are nice but the best would be a flex shaft screw driver check out this article as it is better that me writing an essay here is the link http://www.sytyarchives.com/howto/viewarticle.php?article_name=heater_core.php&dir=climate_controls From Automotiveforums.com
Ok, so the first thing to do is remove the one heater core box bolt that is under the dash on the passanger side behind the carpet and cut the two black taps with a dremmal on eithe sided of that bolt. Next remove all the undash plastic, glove box, front dash cover and insterment cluster. Next on the driversside there are two 90deg angel brackets under the stearing colum remove them (4 screws) also there are two screws on the lower part of the dash one one each side near the floor next to the door that need to be removed. After that you need to remove the speaker covers and the defrost vent cover to access the screws that will lossen the dash I think there are 6 screws. Once they are removed the dash will roll back. You need to disconnect all the wire harneses that are connecting the dash to the fire wall so the dash can be pulled out farther. (I found that tilting the dash just did not work there was not enough room to work.)

Ok time to remove the heater core in the engine compartment there are two bolts and one nut. The nut is right next to the hoses that go to the heater core. One bolt is just to the left of the distributor below the heater core supply hoses. the other bolt is the hardest bolt to get to it is in the A/C evaporatior box where it says cut here for service so get in there and lossen that bolt and the heater box comes right out on top of the hater box there are two screws that are holding a cover over the hater core remove them and that is the core. To reassemble just do it all again backwards.

Posted on Feb 08, 2010

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I would remove bottom console behind radio and temp controls. Or going behind glove box may be easy as well.

Posted on Feb 08, 2010

  • Nate Stansfield
    Nate Stansfield Feb 08, 2010

    You are most welcome! And thank YOU for using Fixya!

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Heater core replacement 98 chevy S10 2.2L engine


Tyrone, Check the attached links,instruction and guides, the last link has some very good info. and pics. on S10 heater core replacement. Good luck.
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1998 Chevy Blazer heater core installation


Your job will be a long one, but not the worst one out there by far. You will need to unhook the battery, remove all of the lower trim from the driver and passenger sides under the dash. Remove the nuts that hold the steering column to the bottom of the dash and let is rest on the drivers seat. Remove the kick panel trim from both the drivers and passenger side foot well. There are 2 bolts on each the drivers and passenger side that hold the sides of the dash board to the vehicle, then there are I believe 6 bolts along the front edge of the dash along the windshield that need to be removed. This should let the dash be tilted back away from the windshield and rest atop the steering column. There will be an access door in the top of the heater box that will allow removal and replacement of the new heater core. You will still need to unhook the hoses under the hood, and you might need to unplug, or remove some ground wires hear and there, just make sure you take note of what you have to unplug or remove and make sure you put everything back like it was before you started.

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Bought a used 1996 couger and the heater core is by passed. im asumming the heat core needs replacing is it necessary to remove the entire dash my haynes manual does not say to remove it but when i follow...


1996 mercury cougar heater core replacement
we just bought a car with the same problem

http://members.tccoa.com/timb/Heatercore.htm

we did not have the bolt above the gas pedal
"1 on the tunnel above the gas pedal"

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Rottenweiler630@My 84 s-10 blazer has developed a heater core leak. Where can I get the procedure for R & R of the core?


Please don't forget to rate! Thanks!

Removal & Installation

The heater core is removable from under the right side of the instrument panel.

  1. Disconnect the negative battery cable.
  2. Position a drain pan under the radiator, open the drain **** and drain the cooling system to a level below the heater core.

Plug the heater core tubes to avoid spilling coolant in the passenger compartment during removal.

  1. Disconnect the heater-to-engine coolant hoses from the core tubes on the firewall, in the engine compartment.

c17hydro_116.gif

Exploded view of a common heater core and case assembly



c17hydro_117.gif

If necessary, loosen and remove the under dash cabin light retaining bolt



c17hydro_118.gif

With the bolt removed, the light and housing may be repositioned out of the way


On some early model vehicles, the cabin light mounted under the dash may interfere with cover removal. If necessary, loosen the retaining bolt and reposition the light housing with the wiring attached.

  1. From the passenger compartment (under the dash) remove the heater core rear case cover-to-cowl screws, then remove the cover from the vehicle.

Be sure that all are removed before attempting to remove the cover. If necessary, unbolt and reposition all/part of the dashboard for better access.

  1. Remove the straps or brackets from each end of the heater core.
  2. Carefully remove the heater core from the cowl and case.

To install:

  1. Insert the heater core into the case, taking care not to damage the tubes as they are inserted through the cowl.
  2. Install the straps or brackets to the ends of the heater core and secure using the retaining screws.
  3. Install the heater core rear case cover and secure using the retaining screws.
  4. If moved for access, reposition and secure the dash mounted cabin light and housing.
  5. Connect the heater-to-engine coolant hoses to the core tubes.
  6. Connect the negative battery cable, then properly refill the engine cooling system.
  7. Run the engine at normal operating temperatures and check for leaks.

There is a bunch of pictures to post so please keep refreshing your page. This is gonna take a few minutes...

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How do i replace a heater core in my 97 blazer


Heater Core Removal & Installation To Remove:
Heater core removal gm-10-00-651.gif

  1. Remove the heater/vent module.
  2. Remove the heater core access cover screws.
  3. Remove the heater core access cover.
  4. Remove the heater core from the heater/vent module
To Install:
  1. Install the heater core to the heater/vent module.
  2. Install the heater core access cover and screws to the heater/vent module.
  3. Install the heater/vent module assembly to the vehicle.
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1 Answer

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you have to start by taking the black covers off under the dash. And you should look under the hood to see where the heater hoses go into the fire wall. that is where the heater core is located under the dash!
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