Lets see. We've had a few chilly mornings recently, my car starts fine, I have the climate control set on auto at about 70ish. I let the car warm up for 5-10 mins and everything is fine. The issue occurs while driving or even when idling I suppose after the interior warms up. The air temperature would gradually become cooler and cooler. I find myself turning up the temperature just to stay warm. The blower motor would maintain the same speed, but just start blowing cooler air. I've changed the primary and auxiliary water pumps within the last month....no change. Now, if I put the car in park and rev the engine it will bring the interior temperature back up. Just to experiment...I drove my car about 30 miles after it was fully warm and had the sunroof open about 1/3 of the way just to see what would happen to the interior temp..the temperature stayed dead on. I'm not sure what this proved, but while the roof was open and the ambient temp was about 38 degrees the interior temp stayed at a nice and cozy 70ish. It seems as if the interior temp is accurate, but the blower isn't responding correctly or something
. Where is it coming from and why does it start blowing cooler/cold air? As always any and all suggestions are welcomed. Thanks
By the way..I replaced the radiator, waterpump and auxiliary waterpump...as preventive maintenance when I started to have higher operating temperatures. The problem existed before then...I meant to address last winter.