Question about 2003 Ford Excursion

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Front heater only blows warm air when engine is at a high rpm. rear heater blows cold air all the time. replaced thermastat and coolant

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It could be a couple of things.
1) Check the fuses to make sure they are good.
2) It could be the relay switches, that happens occasionally a mechanic will need to look for that problem though.
3) The blower motor could be on the fritz. depending on its location a mechanic might need to do this also.

I hope this helps out.

Posted on Feb 13, 2009

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3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
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