Question about 1998 Chevrolet Blazer

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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

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  • Anonymous Mar 20, 2014

    If heater core is busted will the air conditioner still work?

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  • 553 Answers

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.

Posted on Jun 07, 2010

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2 Answers

Not overheating but blowing cold air


check radiator coolant level when cold and if you need to top up only use antifreeze ,if problem persists and its losing coolant then take to a garage

Feb 22, 2016 | 2001 Chevrolet Cavalier

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How do I fix the heat


You have one of two problems. The heater core is plugged /
restricted or there is an inoperative internal blend door motor problem. Start the vehicle and let it reach operating temperature. Feel the hoses under the hood that go into the heater core. They should be close to the same temperature. If one is hot and the other luke warm/cold.... the heater core is plugged/restricted. If both hoses are near the same temperature, suspect a defective/non operational blend door motor that controls heat/cold/airflow attached to the heater box assembly

Dec 21, 2015 | 2003 Dodge Stratus

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Why is my heater blowing cold


Most likely it is the heater control valve that shifts air from blowing across your heater core to your air conditioner core.

If your fan works and your car is fairly new..meaning your heater core isn't dirty and full of craap...then it is the climate cotrol valve.
If you are lucky, it might be a thermostat that is bad and blocking hot water from entering your heater core. Bottom line, if hot water doesn't circulate thru that little heater core, you won't get heat.
You might be able to look under the hood and grab the hot water lines that go thru the firewall and feed your heater core. If they feel cold to the touch after engine has warmed up, then you aren't getting circulating water to the heater core. If they feel nice and warm, then the heater core is fine, but your climate control valve has closed off the fan that blows across the core to disperse heat into the cabin

Feb 24, 2015 | Cars & Trucks

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2002 Ford Taurus, Heater blows cold air?


What have you checked so far ?
Radiator full of coolant ? Heater hoses getting hot ?

Feb 23, 2015 | 2002 Ford Taurus

1 Answer

Vehicle won't blow hot air. The fan works, but only cool air regardless of the temperature setting


IF YOU HAD A BAD HEATER CORE OR WATER LEAKING INSIDE THE CAR THEY PROBABLY BYPASS YOUR HEATER CORE. THE HEATER CORE IS WHAT CAUSE THE INSIDE THE CAR TO WARM UP

Nov 17, 2012 | 2005 Chevrolet Blazer

1 Answer

Rear vents blow out hot air when a/c is on


Keep this principle in mind: Heat, flows INTO cold... When you hold an ice cube in your hand, your hand gets cold because the heat from your hand is flowing INTO the clod ice cube, NOT because the cold is flowing into your hand.

On this particular vehicle (like many modern vehicles), hot water from the engine flows through the heater core at all times, even when you have the A/C on or when you have nothing (A/C, heat or vent) on. The system uses a door that closes down over the air opening to the heater core to keep you from feeling warm/hot air when it is not desired. The reason(s) you feel that the vent air is warm even when the outside temperature is somewhat cool is/could be caused by the following:

First, although as mentioned above, the heater core is restricted from receiving air when you are not commanding heat by the control panel, the heater core ultimately ends up as warm as the engine temperature. This is generally somewhere around 200 degrees F. Because all the air coming out of your vent(s) must pass over the door that restricts air over the heater core, and because the heater core gets so hot, some of that heat is picked up by air passing over the hot door even though it is closed.

Second, the door that restricts airflow from passing over the heater core has a seal around it. After a period of time this rubber (or usually felt) seal deteriorates, allowing some air to actually pass over the heater core. Since the core is hot all the time, some of the air gets heat loaded, producing warmed air.

Third, the door is operated by (in the case of your vehicle) an electric motor which responds gradually/proportionately to the setting you select on the temperature dial. If the motor gets out of calibration (can happen from time to time), if the control head has a 'glitch' and sends an incorrect signal (chronically, usually), or if the electric motor (called an actuator and contains its own little electronic 'brain') becomes faulty, the door may not be closing completely. This symptom can also be caused by a problem with the door itself, where the door gets stuck due to warping of the plastic case, a foreign object preventing it from closing (usually a pen or toy dropped into a vent or defrost opening), or a broken or cracked door hinge.

Last, the vent intake opening, where the 'fresh' air comes into the car on the 'vent' setting, is located just below the windshield on the passenger side. This opening receives its air directly off of the sun-baked, engine-heated hood and because of this the air is never as cool as outside air even on a cooler night.

I hope this answers your question. Many domestic vehicle manufacturers have begun installing heater control valves on their vehicles once again as they nearly all used to have. Note that the fix for most everything I have mentioned here requires removal of the dash of the vehicle or replacement of the control head and therefore is in many cases not worth the investment if it is not an extreme problem (for example, unless the system is stuck on full heat in the middle of summer. Additionally, remember that, if you so desire, manual shutoff valves can be placed in the heater hose lines (please consult a qualified mechanic as water from a vehicle can and will scald and burn you!), allowing you to manually shut off the flow of water into the heater core, thus reducing some of the heat (Readers note that certain foreign vehicles REQUIRE water flow through the heater core at all times for engine cooling and are not candidates for this procedure!).


Parts Of BMW.

May 30, 2012 | Cars & Trucks

2 Answers

Air conditioner suddenly stops blowing cold and starts blowing heated air. Control panel indicates that it is still on air conditioner. Switching the control from vent to cold does not have any effect. ...


If you are absolutely confident the AC compressor is not kicking out on low pressure then it is the blend door actuator.

The blend door determines how much air blows through the heater core or evaporator.

The actuator can be purchased at dealer and maybe at a local part store.

May 27, 2010 | 2005 Chevrolet Avalanche

1 Answer

Air Conditioner Problem


the most common problem here is a defective air temperature control blend door actuator, this is what moves the door that controls air flow across the heater core or the ac evaporator core, to replace this requires u remove the dash assembly.

Aug 13, 2009 | 2005 GMC Yukon Xl Denali

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Air is not blowing cold


All blend air doors moving as they should?

Nov 05, 2008 | 1999 Dodge Durango

5 Answers

Heater blows cold air


the electric motor that open the heat door looses electrical connection there by the door stays on cold / it is located under the a/c heater assembly / which requires removing the whole dash and heater assy// also bleed all air out of coolant system
there are three doors / 1/ a/c heat 2/ mode /defors 3/ recurculation dodgeboy6069@yahoo.com

Jul 19, 2008 | 2004 Jeep Wrangler

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