Heater Problem?

Hi,

It sounds like the coolant is low. They may have had it filled, but driving it allowed additional air to exit the system, thus taking more coolant.

Check to see if the level is full in the coolant reservoir. Don't open it when the engine is hot. Allow it to fully cool off prior to removal of the cap.

Let me know what you find.

Take care,

Joe

Yes. Coolant is full.

The idea that it works when driving and then not as well when you stop leads me to believe there is air in the system.

I attached directions below for static filling/bleeding the system. Do this when the engine is cold.

Let me know if it helps. Also, it starts on step three because steps one and two are telling you to close the radiator drain and engine block drain.

Let me know if it helps or if you have questions. Also, let me know if the engine is reaching operating temperature and if there are any other issues with the cooling system.

Take care,

Joe

See pic below.

If the car is on and sitting still like in a drive- thru or something for a extended amount of time the temp needle will start to rise slow and go back down when fans cut on. Rarely it goes it past the half and doesn't go down and I'll just cut truck off.

Hi,

It sounds like it is running at normal operating temperature. There is either air still in the system or something partially slowing down the flow of coolant to the heater core. However, if the engine isn't overheating, I doubt it is corrosion in the engine or anything slowing the flow.

I would suggest when the engine is cold, open the bleeder I mentioned and see if a steady stream of coolant comes out and there is no air. Are you comfortable doing that?

Let me know.

Joe