Question about 2000 GMC Jimmy
No heat during idle. But once motor heats up after driving for several minutes a little heat will come out but then go away
Heater core is cloged suggest replacing it or tryin to unclog with compressed air
Posted on Jan 04, 2013
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Posted on Jan 02, 2017
SOURCE: 2000 GMC Heater Problem
I had problems with a similar truck,a 1998 GMC diesel after checking to make sure the control cables were operating the blend door and blowing the mess of the heater core,I replace the thermostats.Still no heat turns out there was a small amount of debris collecting in the fitting for the inlet hose at the thermostat housing after removing it and blowing out the lines the heat was fine.
Posted on Dec 05, 2008
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
Posted on Oct 04, 2009
2000 GMC Jimmy heater core replacement
in order to replace a heater core in a 2000 gmc jimmy the coolant must
be completely drained and the entire dash including radio, vents and
panel covers must be removed. four screws hold the top portion(closest
to the windshield) in place. they can be found under the windshield
defrost vent. after the entire dash is removed a safety harness under
the steering column must be removed and the steering column must be
dropped to the driver seat. the heater core housing(black plastic) is
located right center of the dash and is a two part housing one piece on
top of the other. the housing is attached to the fire wall and must
detached before replacement can continue. after detaching the housing
from the fire wall separate the housing by unscrewing the six screws
that hold it together. the heater core is now exposed. disconnect the
heater core from the two hoses and discard. installation is the uninstall process in reverse.
it is a very long and drawn out process that is not accomplished in
just an hour or two . make sure you have most of the day or several
afternoons to finish . Good luck and take pictures with your cell phone to use as reference.
Posted on Nov 27, 2009
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