Are you talking about the overhead vents? only a/c or recirculated air come from the overhead vents.
SOURCE: Heater blowing cold air, 4 babies really need heat....
Your heater core could be blocked. Check the hoses going to it on the inside of the engine compartment. There will be 2 5/8' heater hoses going into firewall adjacent to one another. The tempature of these hoses should be almost the same after your van has reached normal operating tempature and your temp select switch is on hot(heat). If not it's a good idication your heater core may have some blockage in it. You would then have to flush it out or replace it. Hope that helps.
SOURCE: Cold rear heat
the duct work has a door that opens when turning on the rear heat. the actuator that opens it is bad
SOURCE: 2002 dodge stratus heat blows out cold
Start with the simple things first. Is your coolant level full? If not, then fill it first and see if you still have the problem. (With a cold engine, start the car and take off the radiator cap. Check to make sure the coolant is not being pushed out quickly. If it is,then you may be looking at a head gasket or worse.) If you still have the problem with full coolant levels, then the next place to go it the thermostat. it is normally easy to replace, but you must make sure it is installed properly (with a new gasket where applicable). Fill the system back up and you should have great heat.
SOURCE: rear heat don't work
MOST LIKELY THE CONTROL HEAD WITH BUTTONS AND KNOBS HAS FAILED OR THE BLEND DOOR AND ACTUATOR IS STUCK
SOURCE: my fan does not come on and blow however the rear does
This is common you will need to check the front blower resistor, this is located under the dash on the passenger side on heater box next to blower motor. the wiring plug also needs to be looked at. the plug on some of these heats up and starts to burn and in turn the connector needs replacing and the resistor also.
If the connector is good then replace the resistor and that will solve the blower problem.As far as the rear unit not blowing hot air , make sure the coolant is full and if the coolant if full then you will need to take a look at the rear unit blend door. this is the door that opens and closes to control hot or cold air, if the coolant if full in radiator then blend motor may be bad, testing will need to be done to see if its the door or the motor that controls the door. good day
When I turn on the heat in my 2004 mazda mpv
the front air vents blow heat but the rear air vents are blowing cold. I have adjusted every setting is there something I am overlooking.
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