gwliston

I'd appreciate some help trobleshooting my 2001 Expedition 4x2 w/ 5.4L. Nothing really fancy Well, so it's really my wife's car. But I digress...

It has dual (front/back) AC & heat. Lately, the front vents always blow hot air (once the engine's warm). The rears blow hot or cold OK, so I guess it has a good charge. Or is it two separate systems?

I've seen some notes online about the blender door actuator. When I turn the temp control knob for the front, there's no sound or thumps or anything. Just hot air.

So, shall I tear apart the dash to check the temp control and blender actuator? What/where else to check? Is the link between the temp control and the blender actuator a vacuum line?

Bright ideas are definitely welcome.

Thanks,
Glenn

rob_in_sac

I've noticed this on my 97. When I turn the actual heat/cool control from full cool to about mid-way between cool and warm, then back to cool, the air immediately kicks in cool. I think it might have something to do with the switch going out or maybe having something blocking the contacts within the switch (dust, etc.). Try that before tearing the entire dash out trying to fix it.

gwliston

Unfortunately, the switch is working quite well. The resistance changes smoothly across the range.

Thanks anyways.

AZFlyer

Hello,

Try this post, it seems to describe your problem:
http://www.blenddoorfix.netfirms.com

Cheers!
AZFlyer