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Old 11-06-2010, 09:48 PM   #1
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Default 2003 F150 - No airflow from floor ducts

2003 4x4, F150 with electronic climate control.

I've got no air (at all) coming out of the floor (heater) ducting. Fan works fine in defrost, so it's not the fan.

There is hot water in the heater core, so it's not the heater core. You can feel the heat if you put your hand near it but no air flow thru the floor ducts. No air whatsoever out of vents either.

The defrost setting works (has air coming out).

There is full engine vacuum (16.5") to the check valve in the engine compartment near the firewall by the battery but that black line looks like it goes under the battery and not into the firewall. Maybe I'm looking at the wrong line.

I pulled the vacuum connector off the vacuum servo that is on the driver's side of the tranny hump. It looks like it should control the heater ducts on the floor. There are 2 vacuum lines in this connector (yellow and blue). I put a vacuum line on these 2 lines and when HEAT is selected, one line has only 1" of vacuum (engine vacuum is 16.5") and the other line had 0" of vacuum. So it appears no vacuum is going to this servo.

Is this a vacuum leak? A controller problem or something else? I don't have a repair manual for this truck so I don't know what to do next. I can't even find the vacuum line going into the firewall.

If there is an online manual for the HVAC that is available I would appreciate a link.

Is this a common problem on this truck?

Any help is appreciated.

Thanks, DEWFPO

Last edited by DEWFPO; 11-07-2010 at 12:09 PM.
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Old 11-07-2010, 02:36 PM   #2
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Default Having Same Problem

I own a 2003 F150 SuperCrew 4X4 FX4. I recently started having the same problem. I only get air to the defrost ducts in PANEL, PANEL FLOOR, DEFROST FLOOR, and FLOOR modes. I can get air from the panel by pressing my VENT botton. I'm not sure where to even start to fix this problem. It sounds as if we are both having the exact same problem! I look forward to any help in the way of advice and any diagrams and schematics related to this issue.

Thanks,

Trace in Indiana
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Old 11-07-2010, 05:30 PM   #3
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Default me too!!

i also have a 03 supercrew with the electric climate control. mine first started to not put air out thru the floor ducts and then progressed to not put air out thru the vents. it only comes thru the defrost now.
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Old 11-07-2010, 05:39 PM   #4
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Default

It sounds like this may be a fairly common problem on these trucks. If that's the case it must have happened to other members already who have solved the problem. I ran extensive searches on this forum and did not find any answers as of yet.

Hopefully someone here knows how to fix this.

DEWFPO
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Old 11-08-2010, 01:19 AM   #5
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Default i found this on here

http://www.f150forum.com/f6/fixed-ea...st-only-42586/


i got the oring thats bigger and the one thats smaller so tomorrow im gonna get the right one and give it a shot
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Old 11-08-2010, 06:05 PM   #6
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Default

Quote:
Originally Posted by 03fxsprcrw View Post
http://www.f150forum.com/f6/fixed-ea...st-only-42586/


i got the oring thats bigger and the one thats smaller so tomorrow im gonna get the right one and give it a shot
Thanks, I check into it.

DEWFPO
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Old 11-09-2010, 12:41 AM   #7
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Default that seemed too fix mine

thanks f150 forum!!!
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Old 12-04-2011, 11:53 PM   #8
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Quote:
Originally Posted by 03fxsprcrw
thanks f150 forum!!!
Did this this morning and it worked like a charm. 2003 with climate control; easy fix, thanks all.
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Old 12-04-2011, 11:53 PM
 
 
 
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