I have a 98 ford taurus,that has no heat. The a/c works fine,blow reall cold air seems like its not mixing. Checked the knob that controls the mixing and its turning back and forth. Replaced the water pump. The coolant resevoir has been replaced 2 times in the past year. The last time i replaced the cap kept popping off so i put the old cap on,but it looks like the the cap has some kind of relief on it and it leaks out of the cap. Have to add coolant back in every day. I also flushed radiator few times. The first time it came out looking real brown with chunks in it. Seemed like it was working but went back to blowing cold air. Im going to try to find some door to open , i believe is on th blower to see if that works . I live in nc so it doesnt get real cold but my kids complain there cold. Every other weekthat i get the. Dont have alot of money to take to a shop.