> I was thinking the problem was the heater > (hot water) control valve...mine just seems old and very stiff to press > in.....How can I tell if this part is why I get no heat in the winter.... Mike, An easy first thing to check is to grab hold of the pipes running into the heater core and see if they are getting hot. This will tell you if it is a coolant circulation problem or an in-the-dash problem. Walt