Most likely your climate control module has gone bad or one of the connectors is not properly seated. If your stereo has been replaced recently this would be one of the symptoms.
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?
You either have a bad controller or a bad actuator.........
Most likely a bad or disconnected vacuum hose to the defrost/floor selector in the heater ducting.
Prob the control switch. I have a similar problem with a 1993 Taurus. U put it on ac it blows out def. Def. blows out vent and none of it really blows out unless it's on high.
There may be several reasons why the air only blows out the front vents and not on the floor or the defrost on the 2003 Dodge Ram. The fuses may be blown, or the heating coil is not working correctly.
most likely your heater controls run via vacuum lines. cracked or broken lines could cause this.
electric defrost, using an electric heater that the air from the evap fans blows over and defrosts the coil, usually time initiated temperature terminated
You lost the vacuume supply coming from the engine, defrost is the default mode if a mafunction in the vacuume supply is lost.
The 1984 Buick uses vacuum lines to change air flow from defroster to ac vents. Check the entire vacuum system for leaks.
You have vacuum line leaks somewhere.
Faulty Function selector switch. Consider replacement.
under the dash on the passenger side
the heater blows warm air when fan is on low but blows cold air when fan is turn to higher setting
Cold air from the defrost indicates that the air doors are in the wrong position. The doors are vacuum controlled in most vehicles. check the vacuum system for a leak.
Could this be 2 separate problems?Stuck in defrost modeNo heatSee "Related Questions" below for more about both
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
the mode door inside the hvac unit has most likely broken causing to to default to defrost. sometime the actuator is at fault, wither way the dash has to come out
It is a chemical change.
Which do i hook to to charge the freon in a 2004 ford expedition
The fan motor is easy to change. It is uder the hood on the passenger side right up near the firewall. 7mm. vbd The fan motor is what blows the air into you car for heat, AC, and defrost. vbd
why dont bottom vent doors not open on 2001 gmcsonoma
The first thing that you need to check will be the vacuum hoses for leaks, breaks or loose fitting ones.....
blower motor resistor
blower motor resistor