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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  • Chevrolet Master
  • 5,332 Answers

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 FixYa.com!

Posted on Feb 08, 2012

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Posted on Jan 02, 2017

  • 10 Answers

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

emissionwiz
  • 75077 Answers

SOURCE: Leaking Heater hose or Core

REMOVAL & INSTALLATION
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."

jturcotte
  • 7768 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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1 Answer

No heat when moving. when i sit still i get a lot of heat. I replaced the thermostat, coolant level is ok. both heater core hoses get hot.all doors and heat settings work. temp gauge stays right at 200...


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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See if your library has a Stratus shop manual and check the heating system chapter. You didn't say if the engine was reaching operating temperature or not. If the engine is warm but you are not, I would say the problem is in the heat exchanger somewhere. If your engine is cold, you can't really expect the heater to get warm, now can you. Then you have a different problem to chase.

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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Does the P1135 code effect the heat that comes into the car?


P1135 is an upstream oxygen sensor code that has absolutley nothing to do with the heat not working. Most likley you have a bad thermostat,or a clogged heater core, or one of the blend doors in the vent system is not opening/ closing

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The cooling system should be flushed but lets start with the heat,remove both hoses from the heater core, install hose to each end of the core about 3 ft long next take waterhose and and start to flush out start with one side and flush with hose on full water, then move to other side , do this a few times, water flow should be clean and flow good, after that if the heat is still warm replace the thermostat and that should solve the problem. good day.

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My 2002 volkswagen passat is blowing cold air when I put the heater on. I took it to a dealer and they said that it could be because my car has a sensor that detects the temperature in the car and when its...


Your brother's mechanic may be correct but you may want to double check if you have a bad flap which opens / closes the access of coolant thru your heater hoses to your heater core. This component is called an actuator which may be defective.

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Changed thermostat and flushed heater core heat is warm, not hot.. and temp. gauge works sitting still but goes down back to 0 when driving


SOUND LIKE PROBLEMS IN THE AIR TEMPERATURE CONTROL DOOR NOT OPENING.CLIMATE CONTROL VECHICLE HAS TO BE HOOKED TO DIAGNOSTIC EQUIPMENT TO CHECK.IF YOU REPLACED THERMOSTAT.FLUSHED HEATER CORE AND RADIATOR.YOU HAVE THE RIGHT AMOUNT COOLANT IN THE COOLANT SYSTEM.LET DEALERSHIP CHECK IT OUT.

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the most affordable thing to do is either flush radiator and change thermostat.and see what happens the other thing is your heater core is clogged or is no good

Jan 30, 2010 | 2002 Toyota Corolla

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Have no heat. Have replaced heater core,


I don't know your vehicle, but does it have a blower door tucked in where the heater core is? If it DOES and that's broken then it could be the whole problem. It would mean it isn't switching from the A/C side of things to the heat side of them. Hope this helps, good luck! Also, just looked up the proper name for what I'm talking about, it's called a "blend door" and I think your car has one. It's what I would check, again, good luck!

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3 Answers

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Hello,
The thermostat was a good choice however you should go to a service station and get a complete cooling system flush.
your heater core and or radiator could be clogged.

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