My Heater is not working

A little more information is needed. Where does the temperature gauge stay? this guide can help us fix it

https://www.2carpros.com/articles/car-heater-not-working

Please run down this guide and report back.

Park the car in a quiet location. Shut all doors, turn the key on, wait for all dinging to stop. Then turn the heat selector from cold to hot and see if you can hear a litthe motor running followed by a dull thud. Then try it from hot to cold. If it does not make a noise, the actuator is bad. If it makes a noise and no "thud", the door is broken or the gears are stripped in actuator.

Since you have an auto temp control system, you likely have a bad Blower Speed Control Module. They fail quite often. It's located in the blower housing, right near the blower motor.

It is probably 1 of 2 things. Your blend door is stick open/closed or your valve that lets warm water into the heater core is broke. There should be 2 lines that go into the heater core into the firewall of the car. The valve should be right in that area or just on the other side of the firewall. You can manually check the valve and see if it is causing the issue. Your heater core could be clogged as well though.

Good luck.

4hundred thirty thousand miles? You mean heat dont blow?

Check the blend door if it feels like heat is on all the time. That is a lot of miles. Does it still run well for you?

If it's getting heat but not blowing check your underhood wiring on firewall pass side to fan / resistor/ speed control. If nuthin looks burnt melted try unplugging and re-plugging. Could also be bad speed control or resistor.

First thing to check is that both heater hoses are hot to touch with the engine at normal operating temp, check that first and let me know what you find.

What you hear is coolant entering the heater core. It can be caused by low coolant or an air pocket in the system that needs bleed.

Let me know if you have other questions.
Joe

First thing to do is check your engine coolant level when the engine is cold so you do not burn yourself, unless of course you have an overflow jug that you can just check, because if the engine coolant level is low, the heater core will not have hot coolant flowing through it, it will have just lukewarm air which might just feel cool by the time the blower motor blows air across the heater core.