Good evening

Last spring i purchased an 08 600hl. This is my first winter with this car and I have come across an issue. when it is extremely cold like it has been for the past few days the heating system for the interior of the car does not seem to be working properly. when i warm up the car and put on the heat it blows cold air. It is only when I am driving that the heat comes on. While i am driving at a moderate speed the heat works fine. However, when i drive slow, such as driving around a parking lot and its only running on hybrid battery power, it starts to blow cold air again. When i put the car in park and its only running off the battery i only blows cold air even on the "HI" temperature. I have the rev the engine to get the heat to kick in and then it will stay on. This is and issue or a normal behavior for this car.

all feedback will be greatly appreciated
Thank you in advance.

There is a full thread on this already. First step is having your coolant serviced. The levels have to be right on. That was my problem on my 600..issue went away immediately

Study this thread thoroughly... Hopefully it will do the trick (sure sounds like it!).

https://www.clublexus.com/forums/ls-...cold-days.html

thank you for the rapid response!!!

is the coolant service covered under warranty?

Caha..Thanks..you beat me to it. Was looking for link.

OP, respectfully request for users to utilize the search feature prior to starting a new thread. More than likely, the issue has been discussed and helps keep the clutter down. Thanks.

Lots of reports in our forum about insufficient heating. The advice about the coolant level is right-on.

Here is another thread link:

https://www.clublexus.com/forums/ls-...t-heat-up.html

Coolant is fluid and therefore not covered unless it has to be drained for repair of a covered component