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Old 03-22-2008, 07:58   #1 (permalink)
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Join Date: Mar 2008
Location: Hidden Valley Lake CA
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Heater air control problems

Greetings,

Before I take my 2007 Ranger to the dealer I want to verify I actually have problems. Searching the threads indicates a possible problem with the air door controls.

Issue #1: Sounds like I have a vacuum leak at the A/C-heater selection control. I can hear a hissing noise and wiggling the knob will make the hissing louder or softer depending on which way I turn it. After stopping the engine, the noise will continue until all vacuum is gone.

Issue #2: No matter what setting I select on the heat side, the majority of the air flows through the defroster vents. If I turn the selector to 'off' there is hot airflow through the defroster vents at highway speeds and cold air flow under the dash on the passenger side. When the system is off, leaves blow onto the floor from somewhere under the passenger side dash. I assumed the HVAC system air intake was the cowl under the windshield, but there is no way leaves could be getting through those holes.
The A/C side air control functions correctly and will freeze me out of the cab.
This is a 2007 Ranger with 18k miles which I bought new May 2007.
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Current:2007 Ford Ranger XL
Past:
2005 Focus I4 5sp
2004 F250 Lariat 6.0 PSD auto 2wd CC 8' bed
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2000 F350 Lariat 7.3 PSD 6sp 2wd SC dually
1999 F250 XL 7.3 PSD auto 2wd Reg cab 8' bed
1993 F350 XLT Turbo 7.3 IDI CC Dually 5sp 2wd Land Craft conversion
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Old 03-22-2008, 15:17   #2 (permalink)
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Join Date: May 2007
Location: Surprise, AZ
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Re: Heater air control problems

I have had the same issue before. The problem is with the vacuum supply to your control module. The line is cracked or has come off of the control selector module. When there is a big enough leak or complete lack of vacuum the door defaults to the defrost position. Just pull your controller out of the dash and you can probably fix it yourself and save a few $.

Good luck!

Jeff
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Old 03-28-2008, 16:37   #3 (permalink)
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Re: Heater air control problems

Thanks so much. That was it.
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Current:2007 Ford Ranger XL
Past:
2005 Focus I4 5sp
2004 F250 Lariat 6.0 PSD auto 2wd CC 8' bed
2004 Ranger Edge 4.0 V6 auto 4x4 SC Step side
2000 F350 Lariat 7.3 PSD 6sp 2wd SC dually
1999 F250 XL 7.3 PSD auto 2wd Reg cab 8' bed
1993 F350 XLT Turbo 7.3 IDI CC Dually 5sp 2wd Land Craft conversion
1996 F150 Eddie Bauer 4.9 I6 5sp 4x4 Reg cab 6' bed
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