heater not working

Hello,

It sounds like you need to replace the temperature blend door actuator is not working here is a guide to help you see how to change it out.

https://www.2carpros.com/articles/replace-blend-door-motor

Please let us know what you find.

Cheers

Dual Automatic Climate Control System Problems

Check the blend air doors to see if they are working. If they are, you need to check the heater core. When the engine is cold, make sure the coolant is full. Next, start the engine, turn the heater on high, and allow the engine to warm up. Feel both heater core hoses. Both should be hot. If only one is hot, the core is most likely plugged and will need back flushed.

only getting luke warm heat out of heater , fan blows fine , heat gauge is at 1/4 hash mark ( seems to be cool to me ), had checked coolant , was low and added about 1 1/2 ouarts coolant ,didnt make any difference, not any exesive smoke comming out of tailpipe , oil 1/2 quart low ( due for oil change )

Is the engine warming up to a normal operating temp?

I've had the experience with two cars of adding coolant to the radiator and the system developing an air lock where the heater blew cool air afterwards. On most newer cars, there's little 'petcock' screws that need to be opened to allow air out of the system. Does the top and bottom radiator hoses feel about the same temp (so you know you don't have a thermostat problem)?

Assuming the thermostat is okay and it's an air lock, you can do more research to see the procedure for clearing any air lock OR if you took the car in for a radiator flush, they generally know what and where to look to return a good working heater to you.