Heater does not always blows hot air

Hello,

It sounds like you have a temperature blend door actuator that is out. Here is a guide to show you what you are in for when doing the job:

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

Here is where the location of the temperature blend door actuator is on your car (below).

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken