Last post on Jul 30, 2012 at 2:02 PM
You are in the Ford Crown Victoria/Mercury Grand Marquis
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Ford Crown Victoria, Mercury Grand Marquis, Sedan
Apr 08, 2011 (10:40 am)
i have been working on ac on 99 gm and w/ vaccum lines off i let the vaccum pulled go and now i have hooked all back up and nothing no fan ,defrost, floor, etc... help
#11 of 11 Re: Not the control head [snorkelbobby]
Jul 30, 2012 (2:02 pm)
you had a fix for a grand marquis air blown out the defrost when the ac unit is running. IT was dated jul 26,2010, do you still have the picture for this fix? If you do could email me a copy of the repaired vacuum harness job. I posted your fix below. my email is toneyjordan98yahoo.com
71 of 172 How to fix this problem for $2 by snorkelbobby
Jul 26, 2010 (12:07 pm)
I just finished fixing a 2003 Grand Marquis for air blowing out the defrost only. This is the goverment mandated failure mode.
The problem is that the vacuum harness is leaking vacuum where it connects to the back of the conrol head. The vacuum harness connection ports relax after several years. You can replace the vacuum harness (F5VY-19C827-A) $20, or just clamp it tight with 2 ten inch tie straps from the Lowes or Home Depot.
Pull the trim covering the control head straight out. remove the control head (4 screws). Remove 2 torx screws holding the bottom part of control head in place. Feed a tie strap around this part so it clamps the vacuum harness to the control head. I put one tie strap on either side of the black vacuum supply hose in the center of the harness. Operate the controls to be sure it is fixed.
If you wish, you can disconnect the vacuum harness under the dash for easier working room. It just pulls out.
I can post a picture if needed.