89 ac/heat all comes out the defrost duct

sacky07

Member

Aug 18, 2011

35

0

7

Sep 2, 2011

#1

• Sep 2, 2011

• #1

My 89 doesnt have heat but the ac works. No matter where the i turn the knob to it all blows out the defroster duct onto the winshield. Is this a vaccumm line problem behind the heater/ac controls? Thanks Dustin



edit: sorry, i should have searched first, please delet.

 

G

Green 94 5.0

Founding Member

Mar 25, 2002

2,601

12

79

Ft. Lauderdale, FL

Sep 2, 2011

#2

• Sep 2, 2011

• #2

It is going to be a hard vacuum line that runs across the firewall. Trace those likes back and you should find a break in it somewhere.

 

sacky07

Member

Aug 18, 2011

35

0

7

Sep 2, 2011

#3

• Sep 2, 2011

• #3

Would bad vaccum lines cause the temperature control knob to be really stiff too?

 

4G-KDMP

10 Year Member

Jul 23, 2005

935

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39

CA

Sep 2, 2011

#4

• Sep 2, 2011

• #4

The vacuum has nothing to do with your temperature control knob.

The temperature control knob has a black shielded cable with wire inside that is either pushed or pulled when you turn temperature control knob.

 

jrichker

StangNet's favorite TOOL

In Remembrance. Thank you for your contributions

Mar 10, 2000

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Dublin GA

Sep 2, 2011

#5

• Sep 2, 2011

• #5

Diagram courtesy of Tmoss & Stang&2birds


See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help on 88-95 wiring Mustang FAQ - Wiring & Engine Info Everyone should bookmark this site.

Ignition switch wiring
http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif

Fuel, alternator, A/C and ignition wiring
http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

Complete computer, actuator & sensor wiring diagram for 88-91 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif

Complete computer, actuator & sensor wiring diagram for 91-93 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/91-93_5.0_EEC_Wiring_Diagram.gif

Vacuum diagram 89-93 Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxFordVacuumDiagram.jpg

HVAC vacuum diagram
http://www.veryuseful.com/mustang/tech/engine/images/Mustang_AC_heat_vacuum_controls.gif

TFI module differences & pinout
http://www.veryuseful.com/mustang/tech/engine/images/TFI_5.0_comparison.gif

Fuse box layout
http://www.veryuseful.com/mustang/tech/engine/images/MustangFuseBox.gif

 

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sacky07

Member

Aug 18, 2011

35

0

7

Sep 14, 2011

#6

• Sep 14, 2011

• #6

yellow line and black line were un hooked, thanks fellas