if its a gas heating units then the ploit could be out, or the valve isn't opening up to allow gas into the burn tubes.
If its not allowing gas into the burner tubes, its possible the limits is trip, a flame sensor in front of the bruner tubes could be blow from flames shooting out of the tubes. Or the valve is bad.
If the unit is electic, it will contain 2 to 5 heating elements in it. a Squealor will turn on one element even 90 seconds until the temperature is meet, then it will reverse and start shutting off one element every 90 seconds.
Its is possible that the squealor have lost the 24 volts that is sent to it from the thermostats, or its coil could be bad.
Its possible that the fan fail to come on once, if so there are fuse link in each unit that work like fuses and they could be blow.
The heating coil could be brokem.
Most likely its is the squealor
How do I replace the heating coil in a 2006 Grand Caravan? I have no heat it only blows cold air.
You are likely in an antarctic region.
ruud furnace only blows cold air, no heat
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?
vacuum line from intake manifold to control unit in dash broken or disconnected
No, the compressor only draws out the heat from air. The blower motor either blows warm air or cold air.
it could be your thermo stat
An automobile's heater that blows only cold air could either be a faulty thermostat or, more likely, a faulty heater core. A trip to a mechanic or shop that specializes in radiator and cooling system repair should be able to diagnose and repair any problems.
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.
Try getting it recharged.
The most common reason a automobile heater blows cold air is the water level is low. Check the water level and fill to the appropriate level.
There is something wrong with the compressor or there is no refrigerant in the system. Have it checked out. Goodluck Joe
Only blows cold air with the a/c on while driving, your cooling fan or fan clutch is bad depending on the year, make and model.......... Only blows cold air with the heater on while driving, you will have a bad or broken internal a/c - heater control door.....
possibly thermostat stuck in the open position?
Because it's broken.
Sounds like it is low on freon. Probably has a leak.
it has a dead raccoon stuck in it
If you mean the fan blows but sometimes the air is cold, it probably is low coolant (antifreeze) level in the radiator. Check the level AT THE RADIATOR, not the overflow tank, while the truck is cold.
The door that switches between warm air and cold air may be stuck open to the warm air side. The linkage that switches to the cold air may be disconnected or broken.
u can but it is only if itis realy cold in side so make shore that the heating stays on all the time only when it is cold though ! ! ! ! !
sounds like the unit may be going on defrost. if it only dose it once and a while for a period of time this could be the case. if so your backup electric should be coming on to offset the cold air.
There are a few possible reasonsÊthat an air would only blow cold when accelerating. The top two reasons are that the compressor fan might be malfunctioning or that the compression clutch isn't engaging.
AnswerReplace the blower resistor.
check the thermostat dude may need replacing