The thermostat may be stuck open.
Low coolant level, or a plugged heater core.
If the air conditioner in a Mitsubishi Legnum is not working, there could be a blown fuse. There could also be a loose cable, or a problem with the heater motor.
Could be a bad heater core...also, could be low coolant level. With my car, it was Heater matrix clogged with radiator sealant. The workshop cleaned it and it's start working fine!
Could this be 2 separate problems?Stuck in defrost modeNo heatSee "Related Questions" below for more about both
Your heater coil is bad.
COULD BE A BAD HEATER CORE COULD BE A BAD HEATER CORE sounds like the heater control switch needs replacing.if that doesnt fix it, you need new heater core
If the seat warmer on a 2004 Saturn Vue is not working it could be a problem with the heater element. This element can be found under the seat and will be easier to access from the rear of the seat.
A vacuum leak, or one of the doors is sticking/bad vacuum motor in the heater box.
Assuming the blower fan is working but it blows cold air, it could be,Faulty temp blend door actuator.Plugged up heater core.Faulty thermostat,Low coolant level,
If you are absolutely, positively sure that your coolant level is not low......then your heater core could be plugged. Or the control that turns the coolant flow on/off to the heater isn't working. Make sure the control is working, the flush the radiator. Should cure the problem.
Most of the time internal water leaks under the dash behind the center console are the result of a blown heater core. If your heater is not working, then that could be your problem.
There are several possible reasons why the heater on your hot tub may not be working. It could be due to a malfunctioning thermostat, a faulty heating element, a tripped circuit breaker, or a problem with the electrical connection. It is recommended to consult a professional technician to diagnose and fix the issue.