No heat at idle 2021 G90

[CarDriver]

Greetings all,

Hoping I might be able to get a little bit of help from everyone. I have a 2021 G90, and at idle the car has no heat. The vehicle can be fully warmed up and the heat is cold at idle. I don't get heat until I push the gas pedal and get the engine to about 1250RPMs. At that point the heat is warm. I have had my nearby dealership take a look at the vehicle several times and they were not helpful at all. They have validated that it is not due to a coolant leak of any kind (I don't smell coolant either). The previous time it was in they tried to drain air bubbles out of the cooling loop. I thought this had worked at the time (it was a much warmer day), but the problem is still there. Does anyone have any thoughts about where I can go with this next? I love the car, but it is very frustrating to be cold sitting in a 75k luxury car.

 

[CarDriver]

And now I have a new update. As had been posted by another user in this thread: Remote Start in the Cold, I tested to see if there would be any changes with different fan settings. What I found was that as the other user stated, as long as the fan speed was 6 or below, the heat works. Now here is the more interesting part. When I turn the fan speed all the way back to high, the air turns cold. Something I did not notice before though was that the back vents stay hot. Only the heat up front turns cold.

 

[EdP]

And now I have a new update. As had been posted by another user in this thread: Remote Start in the Cold, I tested to see if there would be any changes with different fan settings. What I found was that as the other user stated, as long as the fan speed was 6 or below, the heat works. Now here is the more interesting part. When I turn the fan speed all the way back to high, the air turns cold. Something I did not notice before though was that the back vents stay hot. Only the heat up front turns cold.

Why do you set the fan speed? I set the temperature, press "AUTO" and never touch anything.

 

[Trixie86]

Not to be a smarty pants, but I usually have to set thermostat at 73 or higher. Also, try closing the air intake for a bit. The recycling warms up faster. I'm sure you know all of this.