Question about 2008 Ford Explorer

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My heater is blowing cold air when the vehicle is stopped, still blows warm air when car is in motion.

Ford service department has replaced the thermostat, heater core and water pump, but the heater is still blowing cool air when stopped at a red light or parked. Heater blows warm air while vehicle is moving.

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Hi there it sounds like the matrix has gone it is at the back of the centre panel at the bottom when the engine is hot touch the matrix to see if its warm

Posted on Jan 02, 2013

  • Amanda Schank Jan 02, 2013

    Ok, I will check it out. Thanks for the info!

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Posted on Jan 02, 2017

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SOURCE: 93 ford festiva heater only blows cold air.

The heater only blows HOT air when set on defrost or floor settings. If you have the lever set for vent, only cold air will come out. Check to make sure you set the controls to floor or defrost. This is standard for all Festiva's.

Posted on Nov 16, 2008

  • 164 Answers

SOURCE: Air Conditioner stops blowing cold air when vehicle is not moving

plus one on the cooling fan problem. if it was low on charge then as you slow down, condensor temps and line prressures would raise therefore it would cool at low speed and and not when moving since the incoming air would drop system temp,reducing line pressure and then cusing compressor to cycle. the auxillary cooling fans must be on whenever a/c is on, if not, thats your problem. get this taken care of because if you get stuck in traffic, your engine will overheat also if fans are not running

Posted on Sep 02, 2009

  • 105 Answers

SOURCE: heater blows cold air have replaced the thermostat

sounds like the controller went bad use temp checker see what your temp is at inlet of heater core from hose

Posted on Sep 08, 2009

  • 173 Answers

SOURCE: The heater only blows luke warm air. Just replaced

Hello...

One of 3 things could cause this, that I know. The thermostat has been installed backwards. The water pump broke soon after install. Due to it being a rebuilt one. And a small clog in the heater core. All of these things are easy to fix.

Good Luck...

Posted on Dec 14, 2009

  • 518 Answers

SOURCE: 1999 Ford Taurus, no heat.

Try checking the two pipes that go into and come out of the heater matrix, is one of them hot? if it is there is an air lock within the matrix, Also is the thermostat opening fully? Sorry i know you said you have changed it twice already but take it out check settings when it should open and close, then boil some water and test the thermostat

Posted on Dec 30, 2009

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It sounds like your AC unit could be overheating or even damaged.

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When the car is moving, more air is forced over the unit, likely keeping it cool enough to run, however, when the car come to a stop, it loses that air flow, and quickly heats up. Thus, the AC would work while the vehicle is in motion, and overheat and stop when the car is stopped and idling.

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sounds like a circulation issue, can be one of three things, the heater core starting to plug, the thermostat hanging open, or the waterpump is getting weak. hope this helps

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