The blend door actuator may not be working.
Check Antifreeze level..make sure there are no leaks under the vehicle.
My 2001 Chevy Blazer was blowing cold air when I had the heat on. My husband flushed the line to the heater core and a bunch of junk came out and now my heat works great. My 2001 Chevy Blazer was blowing cold air when I had the heat on. My husband flushed the line to the heater core and a bunch of junk came out and now my heat works great.
If it still blows cold when it is at running temp, check the engine thermostat, its probably stuck in the open position.
Either a faulty thermostat or you have a low coolant level.
The heater valve could be failing to open for one reason or another.
Low coolant in the system. Defective heater control valve. Clogged heater core.
Either the a/c system is low on freon or the evaporator has an internal restriction....
Sounds like a malfuntion in the heat blend door actuator call your local autozone for more info
Coming out of the vents around 43 degrees
The HTR RR switch in a Kia Sedona determines which air vents the air is blown through from the rear heating. When it is pushed in, the lower vents blow hot air, and when it is not pushed, the roof vents blow cold air.
The a/c - heater controller is out...........
most likely it's a bad thermostat, or your vents not working properly.
This is caused by a blown gasket that allows coolant to escape. Does your engine smoke sometimes when theirs coolant? If yes, then it's definitely a blown gasket.
Possible blockage in the rear air units expansion valve. I just replaced mine for the same reason.
If it does not blow cold air, the system may be low on freon. If the blower motor doesn't seem to blow much air out the vents, one possiblity could be obstructions in the duct work such as mice have built a nest (not uncommon). Also the high speed relay for the blower motor could be burned out.
could be low on coolant
Compressor not operating.
the accuator, located in the rear passenger side is bad. the controls in front when turned go to an accuator in the rear there are two of them one for hot/cold and one for the vents.
It's somewhat cold. It's just very little cold air coming out. Can't hear the vent blow the air as well.
I would recommend 500 minimum.
Engine coolant sensor may be bad
the heater core was stopped up just flushed it out ok now
Check temperature control cable for binding.