Quote:
Originally Posted by jonathondw
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.
The total project time for me was 5 hours. It would have gone alot faster if I had some swivel sockets and longer extensions. I hope this helps you. WHAT EVER YOU DO DO NOT ATTEMPT TO SPLIT THE HEATER BOX THERE ARE SCREWS GOING ALL AROUND THE BOX AND YOU WILL MORE THAN LIKLEY BREAK THE BOX AND AHVE TO REPLACE IT. THERE ARE PEOPLE SAYING TO SPLIT THE BOX ON SOME POSTS BUT THAT DOSENOT WORK ON A 1998 BLAZER.
GOOD LUCK I HOPE THIS HELPS YOU I DID 4 DAYS WORK OF RESEARCH TO FIGURE OUT HOW TO DO THIS REPLACMENT.
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Hi, I just replaced a heater core in a 1997 Blazer S10 this week. I want to save people a lot of problems. My intent is not to ridicule any other individules post but I feel I have some useful information to share. First, the heater core box does not need to be removed from the vehicle. In a previous post it was stated to cut the two black taps on either side of the bolt that holds the heater core box in. This does not need to be done. I removed the heater core without removing the heater core box. This saved me a lot of time and effort. Furthermore, there is no reason to remove any bolts under the hood on the firewall. It is not needed to cut into the plastic housing around the air conditioner (where it says on the housing "Cut here for Service"). By unbolting the dash as describe in a previous post and lowering the steering wheel for more clearance, disconnecting any and all electrical connections, you can raise the dash and turn it and place the whole dash on the passenger seat. Crawling in from the drivers side, you can access the heater core box which does not need to be removed. The radio attenna is held on to right side of the heater core box by a small metal clip. Simply pop that clip off. There are six screws that hold the face of the heater core box on. Remove those six screws.... remove the face of the heater core box and your heater core will be exposed. There is a bracket on the heater core tubes which has a screw securing the heater core to the inner box. Remove this screw as well. And of course, after you have prevously drained your coolant level below the heater core and have removed your heater core hoses, you can then remove the heater core. If anyone has any questions about this procedure, please feel free to contact me at
bobcooke63@yahoo.com.... Good Luck.