No Airflow From Dash Vents???

[martymoose32]

I have a 96 Windstar 3.8. Airflow only from defroster vents. Vacuum problem right??

The engine was replaced recently (dropped a rod through pan) Feb. 04
EGR cleaned at checkup Nov. 04. No vacuum leaks under hood.

I had the vent problem before the engine went, so I asked for the vacuum check at checkup. Said no leaks under hood.

When I first noticed the problem, airflow fluctuated with engine speed. At that time, I changed the front selector switch. The black vacuum line going into the switch had vacuum, but very little. I checked the vacuum motors under the dash and can manually move them. My rear roof vents work fine.

Any ideas?? Diagrams??

Thanks

[haynboy8]

same problem for me to

[12Ounce]

I would suspect that the black hose has debris in it or has been overheated, collapsed or crimped somewhere.....or possibly cracked. Why don't you try a temp "jumper" hose from some good vacuum point under the hood, to the switch, just for a test.

[martymoose32]

If I install a jumper hose and it works, could I just install a tee in a line off the manifold and just keep the "jumper" routed to the selector switch??

Just a thought...

[martymoose32]

Oh, one other thing, I read in another post about no rear heat. I have the same problem. Could my problems be related? I have changed the mode selector switch before, but not the rear/front air switch. Do the vac lines intermingle between the two switches, or are they indepedent of each other? I have tried to find vac diagrams, but no luck.

Thanks.

[12Ounce]

If you go to "helminc.com" look up your model and search for info under "all media types", you will find and "elect and vacuum diagram" book for $32.

Good reading!