If you have no vacuum , you have a leak in the line that goes to where you have no vacuum. The switch may actually be a vacuum switch, and it may be faulty and leaking.
I have some pictures in this thread.
WIndstar rear heat issues
http://www.ford-forums.com/ford-wind...html#post55494
This thread may be helpful too.
Econoline Rear Heat A/C How To
http://www.ford-forums.com/ford-econ...tml#post131707
__________________
BroncoJoe19
2006 Alt Fuel Jeep (electric)
'98 windstar 3.8L
'99 Crown Vic 4.6L
'90 Full Size Bronco 5.0L
I'm not a professional mechanic, take my suggestions with a grain of salt, or a cup of coffee
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