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Heater stuck cold - 2004 Chevrolet Tahoe

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Thermostat may need changing

Posted on Oct 21, 2013

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1 Answer

Heater is blowing cold


Thermostat stuck open, heater core clogged, or heater control coolant flow valve stuck closed. With the engine at full operating temperature check the hoses at the firewall going to the heater. If one is hot and the other is cold or just barely warm, the heater core is clogged or the coolant flow valve is stuck closed. If neither is hot, you have a thermostat stuck open and need to replace it.

Jan 21, 2011 | 1992 Mercury Cougar

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Temperature gauge goes up blower motor works but absolutely know warm let alone hot air and its cold in michigan.


The first thing I would check is the level of antifreeze in the radiator. If it is low, you need to find out why. Hose or water pump leaking, blown head gasket, etc.

If it is not low, possible air mix door malfunction or clogged heater core.

Dec 09, 2010 | Ford Freestyle Cars & Trucks

1 Answer

My 2000 tahoe is blowing cold air.


Check your coolant level and make sure its full, next i would look into replacing your thermostat, if your thermostat is stuck open your engine isnt able to reach operating temperature therefore heater output suffers, your coolant temp gauge should read around halfway when the engine is hot if its not look into replacing the thermostat, if your gauge is reading halfway check the cable going to your heater box when you adjust your temperature on your heater controls its possible that the cable broke or the blend door inside the heater box is stuck into the cold position allowing only cold air to come through the vents.

Dec 06, 2010 | Chevrolet Tahoe Cars & Trucks

2 Answers

Heater blows cold air


Heater core could be blocked up, or the blend door is stuck on the cold side of the a/c evaporator or the blend door is stuck in the cold position.

Sep 09, 2010 | 2002 Dodge Caravan

1 Answer

Air conditioner charged won't blow cold air, heater core will not let cold air enter into the vehicle. If I close off the heater it will blow cold air. Heat blows all the time even in off postions


It sounds like you either have bad controls or stuck dampers in your vents. The stuck dampers are usually caused by plant debris getting in to the air system.

Jun 07, 2010 | 1998 Chevrolet Blazer

1 Answer

Teperature gauge running hot and heater not working


If the car is hot and the heater blows cold air your thermostat is stuck shut or your radiator is really low on water/antifreeze check when engine is cold hasn't been ran like overnight take off the radiator cap and if it is low add so antifreeze/water if heater still blows cold air or water level is ok your thermostat is stuck shut and needs to be replaced.

Apr 08, 2010 | 2004 Hyundai Elantra

1 Answer

Heaters blow cold


could be heater core failure.

If the temp guage remains cold....the thermostat is stuck open, therefore coolant is running thru the motor always. Therefore, no heat anywhere, and poor gas mileage.

Apr 01, 2010 | 1993 Ford Festiva

2 Answers

All i get from my heater is heat i cant turn the ac on, and when i turn off the heater it still blows hot air


Sounds like a stuck heater core valve. Find heater core valve. Under hood, find the two heater core hoses going into firewall. One of the hoses has a valve. Operate temperature control (full heat, then full cold) check that valve changes position. If not either replace valve or control system failure. Also, when temperature control in cold position, one hose should feel hot and the other cold. Temp fix: disable valve to close no heat or on heat.

Jul 10, 2009 | 1998 Dodge Ram 1500 4WD

2 Answers

When i have the heater/defroster on the heater below blows cold air while the defrost blows hot. when i switch to just defrost the bottom heater stays on and blows cold air. when i have front dash and...


It sounds like you have a blend air door stuck. This is in the housing of the heater a/c blower unit under the passenger side of the dash. There is a motor on the top of the housing that could possibly be stuck or on working.

May 10, 2009 | 2003 Dodge Durango

4 Answers

Heater doesn't work in car


i have a ford fiesta 51 plate,when i turn on heater i only have cold air the thermostat has been fixed and coolant levels are ok heatin hoses are all hot,but inside the car its still blowing cold

Oct 19, 2008 | 2005 Chevrolet Malibu

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