[91cobra5.0]

doesnt blow out of dash vents at all and weakly blows out of defrosts, what could cause this?

 

[neverfastenough1]

Oops, misread the post. is the fan operating properly?

 

[91cobra5.0]

as far as i know

 

[neverfastenough1]

Ok, then back to they are controlled by vacuum. As far as troubleshooting it, beats me, but I can give you this link to a diagram to show you how it is controlled. Maybe it will help you figure it out.

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

 

[91cobra5.0]

actually u may have just done it, i had the dash off a few days ago and do not remember seeing a lot of those

 

[ryans88gt]

vacuum for sure. Sometimes the tube in the engine bay gets disconnected.

 

[izze01]

mine did the same thing, and the hose under the hood that runs across the fire wall was disconnected.

 

[91cobra5.0]

which hose? can you guys a be a little more specific?

theres about 4 or 5 hoses that run in that area

 

[saldoggs]

comming off the vaccum tree you will see 1 small line that is black it goes to the passanger side of the car then goes threw the fire wall into the car it feed vaccum to the controls

 

[neverfastenough1]

Are they color coded like the diagram?

 

[tmoss]

no, the color coded vacuum wires are under the dash - the ones in the engine compartment are black or gray normally. The yellow hose under the dash is the one that you need to check first - then under the dash.

 

[neverfastenough1]

no, the color coded vacuum wires are under the dash - the ones in the engine compartment are black or gray normally. The yellow hose under the dash is the one that you need to check first - then under the dash.

Yeah, I was asking about the ones under the dash, but I guess you just confirmed they are indeed that color. That was the yellow one I was talking about.