Heat works for a while at 2500 rpm. I slow down it stops working. The temperature when I was driving about 70 jumped up to Hot then when I dropped back to 60 it went back to normal? Engine coolant is full. A/C works great. Any ideas?

What is your question?

Sometimes I do feel the heat come on randomly when I am riding around. It is usually on low. Fan blows great. No. Noises. ?

How long has your 2009 Lexus LS460 had this problem?

Since weather change and needed heater