First, disconnect the negative cable. But before I continue, why replace it? Is it damaged? Repairing the cable is normally the preferred method. It will be a lot of work to replace since it is installed by the factory before the engine is installed, and will be difficult at best to replace it. But if you insist, after you remove the negative post from the battery remove the positive post from the + side. then I would suggest cutting the other wires so you can see where you must make new connections. If you just remove them you might forget where they went. The cable will lead to the starter disconnect it from there. now you are ready to remove it, but it will have fasteners in places that you can't reach. If you do fasten the new cable in the same locations the original was fastened your new cable might melt on hot engine parts and short out and catch fire.
I would reconsider replacing it your self. If you bring it to a shop they will probably only fix it and not replace it.
SOURCE: 98 sonoma dashboard light replacement
take the dash apart on the driver side and it will be up in the cluster panel
SOURCE: Replacing heater core in 2000 GMC sonoma. Dash is
If the dash is removed you've saved about 9 10ths of the job endurance. Look around, what you believe to be, the perimeter of the heater box. I cannot, and no one else can, tell you exactly where the bolts and nuts that mount the heater box are. Therefore you must viually sixe the box and check outide in the engine compartment and inside under the dash for the mounting bolts.You'll want to start by removing the heater hoses. Then starting at the passenger side engine compartment look for a group of 10mm or 7/16ths nuts retaining the housing and remove them. Do the same inside. The housing is usually held together with screws or clips, it changes year to year. Keep a log or pix of the wires and cables and hoses(vacuum) that are connected to the housing for reassembly. You'll need to "roll" the box out from under the dash depending on how much of the dash has been removed. The core is easy to spot for is has two hoses sticking out, and, is encircled with clips or screws . Also make sure you remove the bracket around the two entry hoses if it has one. Thank you, Dana
SOURCE: I have a 98 GMC Sonoma. The headlights will not
well try this it would make you laugh if this work check your floor brake pull up on it all the way and see if it comes on when the park brake is on they turn the lights off and if there not up all the way it will keep it from coming back on. hope that works for ya.
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