Heater issue

ifightfire · 02-19-2008, 02:21 PM

2001 Expedition. The heat comes on in the front for a short time then goes to cold. When I hit the break hard the heat returns. Anybody have an idea what to look at to fix.
Thanks for any help

jonmark1985 · 02-19-2008, 02:44 PM

Check the coolant level. Then check the heater control valve.

ifightfire · 02-21-2008, 07:29 AM

Jonmark1985 Thanks for you help I'll look into the control.

RickMN · 02-21-2008, 06:40 PM

No heater control valve on this. Vehicles haven't used heater control valves for years. I'd put my money on a bad or leaking vacuum hose to the blend air door actuator or a vac leak in the control. The key here is that vacuum goes up when your foot is off the gas--so the problem is vacuum related.

jonmark1985 · 02-21-2008, 08:24 PM

Hey rick haven't seen you online in a while, I wasn't aware of the control valve, guess you can tell what kind of cars I wind up working on!

ifightfire · 02-23-2008, 08:36 PM

Thanks RickMN I'll look for the vacuum hosed

TBIRD430 · 02-25-2008, 12:07 PM

Did u check ur coolant level?

lapriest · 02-29-2008, 05:01 PM

I have a 99' Ford Windstar. When I turn my heater or defroster on, all I get is cold air. The rear defroster works fine. I did notice that the air control slide switch is pretty loose like it's not connected anymore. Also, when I do move the slide switch, I can hear a thumping noise that continues for awhile, then stops. Meanwhile, I have no heat.

Can anyone PLEASE help me?

Thanks for your time and help in advance.

ifightfire · 03-04-2008, 08:37 PM

Quick update: Found the blend door motor was dead. Replaced and heat works now.