RAY: I’d have to disagree with your mechanic. I think flushing it out is worth a try. TOM: The easiest thing to do is to reverse-flush it by hooking a hose up to the heater core and pushing water ...
Driving an ice-cold car on a frigid morning is no fun and a heater blowing cold air is not only annoying it's a safety hazard. Here is what to do.