Question about Chevrolet Blazer
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
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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Posted on Jan 02, 2017
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The heater core is removable from under the right side of the instrument panel.
Plug the heater core tubes to avoid spilling coolant in the passenger compartment during removal.
Exploded view of a common heater core and case assembly
If necessary, loosen and remove the under dash cabin light retaining bolt
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.
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.
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