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

same problem for me to

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.

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...

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.

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!