My 2001 Chevy Tahoe is running hot 240 degrees and my heater won't work. This just started after returning from a 400 mile trip.

2001 Chevy Tahoe Heat Problem - Tahoe Forum

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Dec 5, 2008 - 10 posts - ‎7 authors 2001 Tahoe, the front heater blows a little hot air when the car warms up and then blows cold air. The rear heat seems to work fine. I changed ...

Rear AC blows hot air - Tahoe Forum - Chevy Tahoe Forum

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Jul 14, 2008 - 10 posts - ‎5 authors
On my wifes 03' Yukon the rear air conditioning blows hot air no .... Pull the panel off and look at the hot/cold actuator shown in the picture.

Not without checking it out first.
Is the system full of coolant, and is the thermostat opening at 195 degrees ?

Sounds like you may have blockage in the radiator. Give it a good cleaning and flushing.

not enough info, what engine, fuel injected? if so what type, multi port, or throttle body? oil pressure is not the problem, it could have a Hi-Perf. oil pump. fix the leaks, they will make a horrible odor. and coolant leaks will make it run hot.

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I would say it's bad contacts in the ignition switch. Metals change dimensions depending on temperature, looks like 45 degrees is the trick point for whatever is in there. My 04 Silverado 5.3 with 196,000 has the ticking, but it is gone within 10-15 seconds.

I was given a 1994 s10 Chevy Tahoe vortex blazer??????? It's either a S-10 pick-up or it's a Tahoe or a Blazer not all three . So which is it ?

There is a possibility that the A/C compressor clutch burned up or got disconnected. Try investigating the wiring for the clutch.

If the only problem is idle and it runs grat above ide then the most likely component is the Idle Air Control valve. This is providing you have no codes stored indicating something else.

check the coolant level when it is low there is not enoughflowingthru heater core

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.