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There is a 1 way vacuum check valve in the eng compartment it is either disconnected or the valve is bad. comes of of the brake booster,thin vacuum line that goes into the vehical

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โˆ™ 2005-03-04 01:07:19
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Q: Why would the heater switch not change off the defrost position on a 1993 Dodge Caravan?
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Why would the heater switch not change off of defrost position on a 2000 S10?

You have a vacuum line disconnected probably under the hood. The HVAC controls are operated by vacuum and when there is no vacuum it system goes into defrost mode.


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it should if you have the heater control in the defrost position this is to remove the moisture from the air


Should ac compressor stay on when heater control moved to defrost in a 2000 durango?

Yes, the ac will run in the defrost position to dry the windshield.


How do you change heater core on 2000 caravan?

I have looked up time to change heater core on 2000 dodge caravan it said 2 hours. I have never done this so I need to know where to start?


Why won't heater change from defrost to floor on 2001 Ford F-350?

you have a fuse out...


Why would a 95 Ford Explorer AC cyle on and off when the switch is in defrost or heater position?

On my 1995 Ford Explorer when the defrost position is selected , and the temperature knob is set in the red area to get heated air to defrost the windshield , the A/C compressor will cycle on and off to help dehumidify the air, but the compressor ONLY cycles on and off in the DEFROST POSITION ( sorry if I'm misinterpretting your question )


My defrost fan is blowing but will not defrost my windows?

That means either you have air in your heater core or your heater core is being bypassed


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


Why does ac and heater on 2000 f350 blow air through defrost when another position is selected ac clutch clicks and air still only blows through defrost?

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Why wont your heater change from feet to defrost but blows out hot air still?

most likely your heater controls run via vacuum lines. cracked or broken lines could cause this.


What does heater hoses do on a vehicle?

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Do cars made for Florida have defrost and heat?

Yes they have a heater/defroster.


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 would your heat only work on defrost?

ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air? ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air?


Why wont my wrangler heater change vents from defrost to panel?

Check that the linkage that controls the damper is connected and working. The linkage is just above the gas pedal.


Who invented the caravan heater?

The Dodge Caravan heater was invented in 1984 by the Dodge and Mopar companies. Since it's creation it has evolved into a much bigger and popular van.


Can't defrost my windshield?

The fastest way to defrost a windshield is to turn the defrost vent on without heat or simply open the windows. Another option is to warm the inside of the car by turning the heater on.


Why on a 1999 Chevy astro van not switch from defrost to heater or to air?

Check for a vacuum leak either under the hood or under the dash Check the operation of the vacuum actuated motors under the dash Check the operation of the selector switch Defrost is the default position for this system


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?

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What could cause the heater or defrost to NOT blow warm or hot in a 1988 Ford Bronco ll?

Blocked heater core, faulty heater valve, disconnected connection to the heater valve.


Where can someone find information about replacing a Caravan heater?

If someone needs information about replacing a caravan heater, can be found on the Camping and Caravnning Club website, a website dedicated to caravans.


Why heat blows out vents only not defrost or floor?

Most likely a bad or disconnected vacuum hose to the defrost/floor selector in the heater ducting.


Where is the engine block heater cord on the 2003 Caravan?

The engine block heater on a Dodge Caravan could be in a number of places. However, the cord for the electrical connection should be near the battery.


How do you troubleshoot a heater ac that will not blow anywhere but defrost in a 92 lebaron?

There is a caseunder the dash that holds the heater core and ac evaporator core. In that case there are what are called blend doors. They are controlled by vacuum from the engine that runs to the doors through a diaphragm. The defrost/floor position is the default position that the blend doors automatically go to if there is a malfunction. Usually when that happens it is caused loss of vacuum. Another sign of a vacuum problem is when there is an apparent loss of air from the dash/side vent position upon acceleration which returns to normal when not accelerating. Annoying but harmless.


Why is smoke coming from your defrost vent?

The most common thing will be that you have a leaking heater core...........