The air conditioner continues to run even when the heater should
The blower works but it sends out cold air (feels like from the air conditioner) even when heater or defroster is supposed to be on and the temperature guage reads in the middle of the guage. And the thermostat is working as the car can be driven (as I do to and from work) 50+ miles and doesn't overheat. Is there a switch or fuse?
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You would need to know if the ac line is cold to each evaporator. Then if the blower motor for the front is getting power and ground. If the blower motor is running but no air is coming out the vents, you would need to check the blend doors under the dash. It could be separate problems, or the PCM or ac control head on the dash.
1st of all, you need to check your anti-freeze level. If its not full, the coolant cannot/will not flow throughout your heater core which the coolant flow through to heat your vehicle. If it is indeed up to the proper level? Than, yes I would look into the thremostat. It may not be opening up.
Check your heater hoses and see if they are hot..If they are ,,the blend door is not operating correctly..Or ive seen the motor work but where the motor hooks to the blend door is broken...When you check the heater hoses make sure they are both hot...Not just one...If only one is hot,,then you have a clogged up heater core...
first feel the heater core hoses see if both are hot if so then your problem is in the blend air door must be stuck on cold. is your blower motor blowing cold air if not your blower motor might be the problem. the blend air door is down by the blower motor.
Two things come to mind one the flap on the inside of the air duct is not switching over to allow heat to come through. Second your heater core could have a blockage. Go under the hood find both heater hoses run your truck till it reaches normal operating temp then feel both heater hoses one at a time. If one feels very hot and the other feels cold or even luke warm you have a blockage.If they both feel hot then look into the duct works under the dash. There should be a valve that switches the door between your heater duct and your ac duct that may not be operating properly. Some valves are vacume actuated so look for a broken vacume line.
Does the car run cold or is the temp. correct. Check the thermostat first. check that the radiator and res. is full. Check the hoses to and from the heater core. If one is hot and one is cold then either the shut-off valve to the heater core is defective or the heater core is plugged.
Check the water contol valve operation ( under hood connected to heater hoses), do you have a full load of coolant?, also air mix door under dash, is the temp of the coolant hot?.Check them all out, you'll find it