Question about 1998 GMC Jimmy

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Need help i have a 1989 gmc jimmy i need to change the heater core it is leakingon the passenger side foot compartment is it hard to change it

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Ok, so the first thing to do is remove the one heater core box bolt that is under the dash on the passenger side behind the carpet and cut the two black taps with a dermal on either sided of that bolt. 
Next remove all the under dash plastic, glove box, front dash cover and instrument cluster. Next on the drivers side there are two 90deg angel brackets under the steering column 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 loosen the dash I think there are 6 screws. Once they are removed the dash will roll back. 
You need to disconnect all the wire harnesses 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.) 
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 evaporator box where it says cut here for service so get in there and loosen 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 is around 5 hours. It may go alot faster if you have some swivel sockets and longer extensions. I hope this helps you. 

Posted on May 29, 2009

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Yes it is a very difficult job to do. You will need to remove the entire dash and it is a job that really should be done by someone with experience in this type of work. If it was a different truck, full size before 98 it is a 15 minute job. If you are going to do it yourself be sure to unhook the battery first and use masking tape to label everything. Good Luck

Posted on May 29, 2009

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Its not hard to change. The hardest part is getting to it. Start by removing the glove box. It should be behind that.

Posted on May 29, 2009

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