Thanks so much for the info! Definitely will help me get to the problem. Only drivers side for sure, that much I know. Comes on hot only whilst driving down the road then, reverts back in a few seconds to cold again. I will check the valves which I did read about here in the "How too's". I am going to try and set the drivers side thermo a notch toward warmer to see if it makes any difference. Hopefully this will give me a lead toward the climate control module being at fault. Just something i have to work on for a while. Again I appreciate the info!