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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

Air conditioner blows through defrost?

  • Thread starter Thread starter CPB00GT
  • Start date Start date Dec 2, 2004
C

CPB00GT

Founding Member
Dec 3, 2001
531
1
18
Florida
Dec 2, 2004
#1
  • Dec 2, 2004
  • #1
I just bought an 89 LX 5.0 notch. The air works but blows on the floor and up through the defroster. Can anybody tell me the problem and how to fix it? I want it to blow out the vents, I live in Florida.
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
34
129
Dec 2, 2004
#2
  • Dec 2, 2004
  • #2
sounds like the HVAC door is stuck. sometimes a small whack with a hand on the diverter door will unstick it.

congrats on the ride and good luck.
 

5spd GT

"the 5.0 owns all"
Founding Member
Aug 7, 2002
9,516
6
99
Arkansas
Dec 2, 2004
#3
  • Dec 2, 2004
  • #3
I had a similar problem after my h/c/i swap...I accidently pulled a vaccum line over on the driver side (vaccum tree) where the hoses are labeled "S", "A/C", "B/R"...etc...and I knocked the "A/C" hose off and did a little tracing and found the loose hose and slid it back in and the vents blew ...before it was the defroster/floor that blew...

Good Luck
 
J

jerry beach

Founding Member
May 20, 2002
2,671
0
46
Ocala,FL
Dec 3, 2004
#4
  • Dec 3, 2004
  • #4
HISSIN50 said:
sounds like the HVAC door is stuck. sometimes a small whack with a hand on the diverter door will unstick it.

congrats on the ride and good luck.
Click to expand...

I want to give it a whack! Yeah! I used to whack it, the evap. housing that is.

check what those guys stated first, then theres a little vacuum diaphram behind the dash that controls the diverter door. Listen for a hissing sound under the passenger dash. Could be a small vac. leak, not enough to affect the engine.
 

mustangt93

New Member
Apr 17, 2003
37
0
0
San Antonio TX
Dec 3, 2004
#5
  • Dec 3, 2004
  • #5
sounds like a vaccume leak to me, check all your hoses, i would start with looking at the vaccum tree
 

trbkrb

Founding Member
Jun 4, 2001
1,976
4
39
Houston, TX
Dec 3, 2004
#6
  • Dec 3, 2004
  • #6
First check the easiest thing to fix. Look right above the accelerator pedal and see if the yellow vacuum line is plugged into the silver diverter valve on the side of the AC ducts. If it has come loose, the air will default to the defroster. Next step would be the vacuum lines to the AC controller and under the dash. Hopefully it is one of the easy lines to fix.

Good luck!
 
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