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.
it should if you have the heater control in the defrost position this is to remove the moisture from the air
Yes, the ac will run in the defrost position to dry the windshield.
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?
you have a fuse out...
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 )
That means either you have air in your heater core or your heater core is being bypassed
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
You have vacuum line leaks somewhere.
most likely your heater controls run via vacuum lines. cracked or broken lines could cause this.
a heater hose runs from intake to heater core to radiator. the heater core is were the heat comes from inside the car as well as defrost
Yes they have a heater/defroster.
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
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?
Check that the linkage that controls the damper is connected and working. The linkage is just above the gas pedal.
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.
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.
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
Could be a vacuum leak "defrost" is the default position of the system Check vacuum lines and motors under the dash
Blocked heater core, faulty heater valve, disconnected connection to the heater valve.
If someone needs information about replacing a caravan heater, can be found on the Camping and Caravnning Club website, a website dedicated to caravans.
Most likely a bad or disconnected vacuum hose to the defrost/floor selector in the heater ducting.
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.
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.
The most common thing will be that you have a leaking heater core...........