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Here are a few reasons, low on coolant due to a leak in the cooling system, plugged heater core due to poor cooling system maintanence and temperature blend door or temp blend valve not functioning properly. Also a stuck open thermostat could cause this.
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Why would only cold air come out of the vent when you put on the heat or the defrost I have checked the panel switches that does not seem to be the problem?
AnswerCheck your heater core, do you smell antifreeze at all?no
1999 dodge caravan heater blows cold air?
First thing to check is open hood and feel heater hoses going into heater core located on r/s of vehilcle if sitting in driver seat.If they are both very hot and feel the same temp,blend door in heater box is not operating correctly.If one heater hose is hot and the other is cooler than chances are the heater core is plugged.In either case a professional would be your best bet for repair.Hope info was helpful.
What cause 1993 grand prix se to blow cold air on defroster setting?
A water thermostat stuck open. Air in the heater hose lines (caused by low radiator coolant). Air temperature (mechanical) control cable not opening the heater hose water valve (under hood).
When you warm up your car in the driveway cold air enters the cab then as you start to drive down the road warm air enters cab?
hi,most likely you have low coolant level in radiator,at idle you have an air space in heater core,causing poor heat,when you move and engine speed increases, water fills heater core,you get heat,.another possible cause is a clogged heater core,but check fluids first.
How can you tell if your heater core is not working for a Chevy Malibu 2000 It blows cold air instead of hot air when on hot but every now and then it works then stops Why?
Make sure coolant level is correct It could be a clogged heater core,maybe it is a birds nest or a rats nest if the car was stored.Usually replace the heater core and it will solve it or maybe it is the radiator itself needing flushed.also it could be the switch is not throwing to the position it should be.If the car was in cold climate before maybe it froze over and then was dooshed with heater core repair stop leak.Thats the best I can guess...
Why does cold air come from the heater?
possible clogged or damaged heater core
What causes cold air to come out of air vents when heater not on?
The heater may not be on - but the fan still blows air through the vents when they're open !
How come your heater blows cold air in a 2000 silverado?
The heater might blow cold air in a 2000 Silverado because the thermostat is sticking and not changing from cold to heat. The thermostat is usually located in a hose that leads from the radiator to the motor.
If the heater works but blows cold air and heater core is good what do i check next?
Get the air out of your heater core.
Why do cold air come from heater on 2000 Nissan max?
You may need to add water to your cooling system.
How will the heater react if the heater core is stopped up?
Your heater will blow cold air only.
What causes a cars heater to blow cold air?
THE CAUSE for this is that when your cold air is on the petrol is used to create air. and that is how cars create cold air
What is wrong if cold air blows out when heater is on?
I assume your car heater is blowing cold air, when the heater is on. It seems that, you have air on your coolant. that air pockets blocks the cooland to travel through your heater. it may be a sign of a bigger problem such as blown head gasket in the old cars, such acura legend
Why is the heater in my 99 ford windstar only blowing cold air?
The most common reason the heater is blows cold air on a 1999 Ford Winstar is a bad thermostat or blocked heater core.
Why would a house heater blow out cold air?
It doesn't really blow it out it just warms the cold air.
Why is your 93 GA GT runs cold and the heater does not work?
If you are saying the heater is blowing out cold air you need to change the heater core which is located inside the dash
1998 Mazda b2500and when you turn the heater buttom to make it blow cold air doesn't change and still on heat?
if youre trying to turn the heater on and cold air comes out, then its most likely the heater core
