Faulty heater cores and low or contaminated coolant levels often come hand in hand, and both issues may lead to your engine overheating and your heater not blowing hot air.The reasons why your car heater not blowing hot air are your coolant or antifreeze may not be getting up to temperature, low coolant level, a faulty thermostat, the heater core is actually blocked, heater control valve, bad air blower. There are various reasons why is your heater not blowing hot air despite being turned on.
Why is the air coming out of my car heater not hot?
If the heater control valve is the culprit, the air coming into your vehicle won’t feel warm. The heater core may also leak coolant. The heater core is clogged from debris in the cooling system. If debris has caused a clog in the heater core, it will need to be replaced. A faulty blower motor.
Why is my air conditioner not blowing hot air?
Either the blower isn't working, in which case you may get warm air but not much of it, or it is blowing air but it may not be very hot. Here is what to check if your heater or defroster isn't working:
Should you turn your car heater off when driving?
While driving on a nice day you may turn your heater off because it’s not needed. However, you notice hot air is still blowing out the vent. After turning the knob to full cool, hot air is still coming out and so you turn off the AC completely. But then why do you still have hot air blowing?
Why is my blower fan not working in my car?
Various issues may cause your blower fan to malfunction, including a blown fuse or damage to the blower fan’s internal components. Regardless, if you can barely hear or feel a breeze when your car heater is running, issues with the blower fan may be to blame!