Heater problem?

Hi,

It could be a few things. First, does the engine reach a normal operating temperature? If it doesn't, the coolant won't get hot enough to produce a lot of heat. This can be caused by a partially stuck thermostat. Take a look at this link. You may find it of interest.

https://www.2carpros.com/articles/how-an-engine-thermostat-works

Next, there could be an issue with the heater core being partially plugged. To check that, start the engine, turn the heater on, and allow the engine to reach operating temperature. Turn the engine off and open the hood. Feel both heater core hoses at the firewall. Are both hot?

Lastly, there is a blend air door actuator that may not be fully functional. However, if you are able to change from heat to cool with ease, that isn't a likely suspect.

If possible, check those few things and let me know what you find. Also, here is a link you may find of interest.

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

Take care and let me know what I can do to help.

Joe