Remove the left rear quarter trim panel.
remove the auxilairy heater case from the vehicule
remove the retainers from the bottom of the heater case
remove the heater core from the case.
to remove the left rear quarter trim panel,
remove the passenger seats as needed
grasp and gently pull the body side rear trim panel in order to
disengage the retaining clips
remove the body side rear trim from the vehicule
SOURCE: replace a heater core in 2000 chevy blazer
it is located under the dashboard against the firewall of the passenger seat. i recomend buying a repair manual from your local auto parts store before attempting as it requires draining, flushing, refilling and bleeding the cooling system as well as removing many other componets like the entire dashboard and thermostat
SOURCE: Where is the low pressure line AC for Express 1500
Look for the accumulator(silver can a/c lines go to) on the passenger side of engine area. The Low side charging port cap should be on the side of the accumulator.
SOURCE: 2000 Chevy Silverado 1500 The heater does not
Had the same thing happen to my truck, the blen door actuator is under the console on passenger side, but the heater core is going to be clogged if you dont have any heat coming through, but a/c works..
SOURCE: How to replace a heater core in a 1994 chevy 1500
As with all vehicles it seems the first part that they build around is the heater core. It is under the dash above the floor housed in a black plastic sealed box. Sealed with goop. Locate that box and start removing everything around it that is peventing taking the cover off. Of course disconnect the heater hoses under the hood a thefirewall.
Warning it is never as easy as it sounds.
SOURCE: 2000 chevy express 1500 van having starting issues
Start with fuel system. Listen for fuel pump humm at fuel tank No humm check wiring to pump for power. Then check for spark at plugs and wires. Remove wire from coil and hold near engine and see arch when you crank. No arch. Replace ignition Modular inside distributor cap or cap or rotor
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