Question about 2004 Chevrolet Avalanche

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My heater on my 2002 avalanche barely throws out any heat on max heat, at relatively cool ambient outside temps. Any suggestions?

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Check your coolant make sure it is full. there might be air in the cooling system.

Posted on Oct 06, 2009

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02 deville getting air out of cooling system


Remove the cap from the surge tank. Set the heater control temp to max (A/C in any mode EXCEPT max). Start the engine and idle until lower radiator to pump hose is hot. Allow the engine to cool to ambient, and then check/fill the surge tank and replace cap.

Nov 19, 2016 | 2002 Cadillac Deville

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My external temp. gauge is reading 1 degree when its hot outside. where is the ambient temp. sensor located and can it be changed by myself?


The external temperature sensor is usually located directly behind the grille and in front of the radiator. It should be relatively easy to find because it will be the only thing in that area with wires.

May 24, 2015 | 2002 Chevrolet TrailBlazer

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I have a vw polo 2002,when stuck in traffic or after long drive,the ar goes off


does the temp gauge reach the red area? check eng coolant .Over heating could cause eng to cut out so as not to cause more damage check the cooling system.When travelling slowly or at stand still turn heater to max heat and max speed this will cool eng but is only a temporary solution

Mar 26, 2014 | 2002 Volkswagen GTI

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1998 gmc surburban. front blows 82 degrees, rear blows 48 degrees. ambient is 91 degrees. this is with max-recirc-full tilt.the valve for the heater core does not change position no matter where i put the...


Hi John,
Your right with your diagnostics, you have a blend door problem. If your switching to cool air and it is still hot then you also have a heat exchange unit fault, this is the component that changes the water flow from hot to cool by shutting off. If it is not operating correctly this will give you constant hot air no matter where you temperature switch is positioned.
As for the warm air while the engine is cold, sounds like the blend door is still open to atmosphere tempreture and if it is hot outside will pull that hot air into the inside of the vehicle.
Have the heat exchange valve checked, and the only way the check blend door operation is to remove the wiring from the blend doors and have the circuit tested. If the circuit is ok then the blend doors will need to be replaced.
Hope this helps

Jul 24, 2011 | 1998 GMC Suburban

3 Answers

Why does my 2004 avalanche not heat up when i am


Check the coolant level. in the winter time It will not over heat very easily but vapor locks can occur and low coolant level will do what your describing ...When you drive the water pump is spinning faster causing coolant to intermittently flow through the heater core so it gets warm then cold at an idle.. also a thermostat that is stuck open will also cause this its also in the cooling system, if the cooling system is full I would replace the thermostat..good luck hope this helps

Jan 28, 2010 | 2004 Chevrolet Avalanche

1 Answer

Heater not producing enough heat. How do I determine the difference between poor exchange from the heater core and a faulty thermostat without throwing my money in the wrong direction. At idle the engine...


temp should stay about half while driving sounds like you have a bad thermostat if guage is half way at idle do you have heat feel both heater hoses should be about same temp if one is cooler not flow coolant

Jan 19, 2010 | 1988 Volkswagen Jetta

3 Answers

Can not find heater control valve 2000 expedition


what year? for 2000, there are no control valves. It mixes a/c air with heater core air to blend the right temp.

SECTION 412-02: Heating and Ventilation 2000 Expedition/Navigator Workshop Manual
DESCRIPTION AND OPERATION Heating/Defrosting The heating and defrosting system has the following features:
  • Controls the temperature and, during A/C operation, reduces the relative humidity of the air inside the vehicle.
  • Delivers heated or cooled air to maintain the vehicle interior temperature and comfort level.
  • Controls the A/C blower motor speed.
  • Cooling or heating can be adjusted to maintain the desired temperature.
  • Uses a reheat method to provide conditioned air to the passenger compartment.
  • The blower motor draws outside air through the A/C recirculating air duct, except for MAX A/C cooling, when recirculated air is used.
  • All airflow from the blower motor passes through the A/C evaporator core.
  • The temperature is then regulated by reheating a portion of the air and blending it with the remaining cool air to the desired temperature.
  • The temperature blending is controlled by the temperature blend door, which regulates the amount of air that flows through and around the heater core, where it is then mixed and distributed.
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1 Answer

My 2002 Avalanche 1500 4WD is not blowing hot air from the heater. The heater hoses are hot but I am only getting cool air. What should I check to see what the problem is?


Gas. Haven't dropped any pencils down the defroster vents have you? Sounds like a mixing door in the heat/ac box is not moving. Could be the motor to the door or a lack of vacumn to the controls. Make sure your canister under the hood is hooked up(probably is since you did not mention having defrost air only). If it has a cable instead of vacumn control for temp, verify it is connected and operating properly. TJ

Oct 14, 2009 | 2002 Chevrolet Avalanche

3 Answers

2002 Dodge Durango AC seems to be warmer as outside temp goes up???


have the coolant fan clutch replace and wash the radiator and condensor out

Jul 19, 2009 | 2002 Dodge Durango

1 Answer

No heat 2002 passat


If you want to back wash just reverse the hoses on the outside where they connect to the heater core. if that don't work look on each hose and see if one of them has a device that has a vacuum line running to it . If there is this is a water shut off thats activated when the air con is on. temporarly you can just put a coupling in where the device comes out

Dec 05, 2008 | 2002 Volkswagen Passat

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