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Q: Heater control stuck on defrost whats problem?
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Why is heater control stuck on blend Wont kick into defrost or heater?

Check behind the heat control panel to be sure that the vacuum hoses are all securely plugged into the control switch. As a safety measure on all cars, if you lose vacuum altogether, the default position for air direction is on defrost, so you can always see out of the windshield. Jake McCahn


Why your defroster suddenly stopped?

The water is not circulating through the heater core or you have a control problem. If the heater is putting out heat then it is probably a control problem. If no heat then - water pump out, low on coolant, or maybe the therostat is stuck open.


Car heater and defrost only blow cold air?

Thermostat stuck open, if older car possibly clogged heater core- when run at oper temp the hoses going into/out of heater core be sure one is very hot - start with thermostat $$$ cheap & easier than a heater core problem!


Defrost on windstar not working what is part needs to be replaced?

Where the air blows out control are vacuum operated.A more common problem is when the air is stuck on defrost only.The cause is essentially the same, so check out the "Related Question" below for where to go next


Why would the heater switch not change off the defrost position on a 96 Cherokee?

1. heat control linkage disconnected or broken or vacuum source problems(low vaccum source or broken vacuum lines) 2. heater unit doors stuck or non functioning heater door actuators


What is the problem with my Defroster blows cold air but the vent and heater blows nothing in your 1999 Ford Taurus?

Could this be 2 separate problems?Stuck in defrost modeNo heatSee "Related Questions" below for more about both


Freezer not freezing in my side by side?

If you have already tried adjusting the temp controls the problem is likely a defrost control that is stuck in the "On" position. It is operated by the same timer as the ice maker. This is not a do-it-yourself repair.


What symptoms means your 2004 Toyota Sienna needs a new thermostat?

Little or no heat from heater/defrost if t-stat is stuck open. Engine overheats if t-stat is stuck closed.


What does the heater valve do?

The heater control valve is used to shut off hot coolant from entering the core when the heater is in the off position. A heater control valve can be actuated by either a vacuum line or a cable from the vacuum heater control valve to the heater core. This hose should be warm; if not the heater control valve is stuck and needs to be replaced


SINCE I HAD MY 1987 Nissan 300zx SMOGGED I HAVE NO VENTILATION FROM THE VENTS WHETHER I TURN ON ECONOMY-AC THE AIRS BLOWS OUT OF THE DEFROST VENT ON TOP OF DASH?

It sounds like your air flow diverter is stuck on defrost. Basically it is a little door that diverts the air fom vent to defrost to feet. It could be either the heater control valve, or te temperature selecter cable is broke.


How do you figure out why the heater and blower work but the ac and defroster do not?

The HVAC doors that control the airflow are activated by small vacuum motors. The system is designed to fail safe; this means that the system will fail in full defrost mode. So, knowing this and the fact that you have heater but no A/C or defrost you should assume the system has a failed control head (the part that you select functions with with button or lever). Or the doors are stuck due to an warped duct system (usually high heat related).


In a 99 Windstar LX the heater blower is stuck in the windshield position I move the selector but nothing changes how do you fix this problem?

Could be a vacuum leak "defrost" is the default position of the system Check vacuum lines and motors under the dash

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