It still does it if its 45 and 50 degrees outside. Thats why I let it sit still and ran it. So no air would be going through the radiator. I'm probably going to change the thermostat since it only like 5 bucks to see if that helps any. Now that I noticed the problem. I've noticed that it takes alot longer for it to heat up to normal temps. 35 degrees here is like a rare temp. Its usually in the mid 40's to 50's.