There are two heater cores
SOURCE: 2001 tahoe front heater not working, rear heater blows warm air
Notorious for plugged heater cores. Also updated plastic restriction couplers mounted at heater core available from dealer. Try back flushing heater core. Run engine till its at operating temperature then carefully hold the inlet and outlet hose breifly with heater fan on high if hoses are nearly the same temp then flow is good , if not then core is plugged.
SOURCE: 2003 chevy tahoe no rear heat
I know the earlier tahoe's have two heater lines running from the engine compartment to the rear under the vechile. Those lines could be clogged or pinched shut. What you do is get two hose locking pliers. Go under your truck, they are two metal lines that turn into rubber and back into metal again farther down the line. First, checked for pinched lines. If none, find where the rubber hoses are, clamp them off, remove from metal lines and drain. Use garden hose to flush fresh water through. When water comes through at high pressure and pretty clear, it should be done. Reconnect hoses, top off radiator fluid and it should be fine.
SOURCE: front aircond. blows warm. Rear air is cold
this is caused by a defective temperature control blend door actuator motor. Don't overhcahrge the system, if one part of dual climate works ok the problem is not the compressor or the system charge
SOURCE: 2002 Tahoe Rear A/C doesn't work
check fuses & power to blower fan motor,plug connections.then apply 12 volts to blower fan motor if it dont turn its bad
SOURCE: Rear heater blows only cold air no matter what the
If this is equipped with a rear heater core it is probably plugged up and needs to be disassembled and cleaned out
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