Question about 2003 Ford Explorer

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Heat won't blow when idle.

I have a 2003 Ford explorer XLT, I get heat as long as I'm moving but, as soon as I stop and just sit the heat won't blow, the air gets cool. I replaced the radiator,the heater coil and the thernostat. Does anybody else have this problem? Please HELP. Thank You I need to know how to get this fixed.

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If you've flushed the cooling system, and replaced heater core (or coil?) and there isn't a flow control valve in-line that may be suspect, then all that's left is water pump getting weak, but lets double check a few things first. If you do have some type of flow control in one of the hoses going to the heater core, make sure it's getting proper vacuum, and not leaking vacuum, if it's vacuum controlled. If not sure, I'd remove it, put a piece of copper pipe or something in place of it, and try heat then, to see if it cures your problem, if it does, go back to what I said earlier, about vacuum. If all vacuum checks out good, replace the valve.

Posted on Jan 04, 2009

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Hmmm tricky, at a long shot it could be the heater control switch in the engine bay, u should be able to see this working if you get someone to sit in the cab and move the temp switch from cool to heat over and over. if this is working ok try bleeding or flushing your heater pipes. considering your getting heat when your moving but not at idle im leaning more to the bleed side of it, you could have an airlock. this would be overcome when the engine is at higher revs therefore pumping a higher volume of water and also at a faster rate through you heater lines temporarily fixing it

Posted on Jan 04, 2009

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