Question about 2002 Chevrolet Tahoe

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I have no heat in my 2002 Tahoe. Could it be the Thermostat or the Heater Core? I really can't afford to take it to a dealership or a mechanic right now. Would like to do the work myself

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When your driving down the road what does your temp gauge read? If it is in the normal place, about the middle, than the thermostat is working. The next thing to check is the coolant level. Make sure the overflow and the radiator are full. If the radiator gets low enough the first thing to stop working is the heat. If both of those are full than feel the hoses going to the heater core. They should both feel hot with the engine fully warmed up. If one is cold and one is hot than the heater core is plugged. Back flushing the heater may bring it back to life. Check those out first. Let me know if you have any questions and I'll do my best to answer them. Thank you for using!

I’m happy to assist further over the phone at

Posted on Feb 08, 2012


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Posted on Jan 02, 2017

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SOURCE: Where is the heater core in my 2002 chevy Tahoe

To find the heater core, follow the inlet and outlet lines from your cooling system.

Yes you will be required to remove the dash to replace it.

Posted on Jan 01, 2010

  • 80562 Answers

SOURCE: Leaking Heater hose or Core

Disconnect the negative battery cable.
Position a drain pan under the radiator, open the drain **** and drain the cooling system to a level below the heater core.
NOTE: Plug the heater core tubes to avoid spilling coolant in the passenger compartment during removal.

Disconnect the heater-to-engine coolant hoses from the core tubes on the fire wall, in the engine compartment.
NOTE: On some early model vehicles, the cabin light mounted under the dash may interfere with cover removal. If necessary, loosen the retaining bolt and reposition the light housing with the wiring attached.

From the passenger compartment (under the dash) remove the heater core rear case cover-to-cowl screws, then remove the cover from the vehicle.
NOTE: On a few of the early model vehicles covered by this manual, some of the heater core cover screws may be partially/fully covered by the dashboard. Be sure that all are removed before attempting to remove the cover. If necessary, unbolt and reposition all/part of the dashboard for better access.

Remove the straps or brackets from each end of the heater core.
Carefully remove the heater core from the cowl and case.
Installation is the reveres of removal. Run the engine at normal operating temperatures and check for leaks

Posted on Dec 01, 2008

  • 6 Answers

SOURCE: '96 Tahoe Almoast Overheats With Water In Radiator...

but is the water circulating ... if not its the water pump or thermostat

Posted on May 25, 2009

  • 197 Answers

SOURCE: How to install heater core.

The whole dash has to come out to get to the core, is it leaking or just cold? If it's only cold, run 'radwash' through the engine to clear the core, if it's leaking, get the part cheaper and presnt it to your mechanic and tell him to fit it, or to make it even cheaper, go to a wrecking yard that dismantles, get a 2nd hand one and then present him with that. Be brave, mechanics add 20% to all parts they supply, they make profit that way. Good luck, Dave.

Posted on Nov 11, 2009

Testimonial: "I think he did say it might be stuck,it's just not blowing hot air is all."

  • 8841 Answers

SOURCE: 99 Cavalier. Changed head gasket,

It sounds like the blend door is jammed, but I would think a mechanic would have checked that. Can you see the door actuator move when you switch between hot and cold?
It could also be the heater water control, which is incorporated into the hose. With the car hot and heater on, feel the temperature of the hoses as they attach to the core at the engine firewall. If the hoses aren't hot, the heater control in the hose has failed closed. Let me know if you have more questions.

Posted on Sep 23, 2010

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If you have a vapour lock your engine will create steam easily but the coolant doesn't circulate. Or it is possible that your impellors on your water pump have corroded

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Lack of water on your floor means your heater core is not leaking. It could still be plugged somewhere. The fact that you get some heat initially, but it turns cold when you turn the fan on, sounds like a lack of adequate warm water to the heater core to me. If the engine is warm, it could be a circulation problem of some sort.

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