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Old 04-07-2012, 03:37 AM
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A/C issue,vaccum diagram question

98 Ford Windstar van 3.8 with front & rear air:
My dash controls for A/C, heat ect. won't change where the air blows out (floor, dash, defrost ect.). I suspect i have a vaccum leak somewhere. I disconnected a vaccum hose coming from the manifold and the vaccum feels weak. I didn't have a vaccum guage to test it with today but I'll get one tomorrow.
My question - Is the area circled in red in this diagram a junction of 4 lines or just where 2 lines cross on the diagram?
Same picture without the red here. I assume the "to chassis" would indicate this is the line the supplies vaccum to the A/C controls, correct?

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Old 04-07-2012, 12:24 PM
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The area circled is indeed a 4 way connection.
IIRC the HVAC doors and vent /defrost/heat-floor are controlled by electric servo motors, not vacuum. The recirculate door may be vacuum but that would not affect defrost- panel- floor operation, that would be servo motors.

Last edited by latech; 04-07-2012 at 12:25 PM. Reason: spelling
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Old 04-07-2012, 12:49 PM
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Is it an automatic temp control or just a normal AC/Heat control??

My Crown Vic started blowing full on hot air no matter what temp is was set at.
Got into diagnostics (who knew AC controls had this?) and it gave me a code for a bad blend door motor.

I was a bit lucky as far as this goes----I guess resetting the AC controls fixed the issue (for awhile anyway)

Even the regular controls are controlled by motors-----according to my boss
that is having issues with the controls in his Ranger.

To fix correctly means dash removal in my Crown----not sure about the Ranger, but I have heard it is accessible thru the glove box.
Windstar ---- have no idea as my Windstar has not given me any AC issues yet.
Engine and trans issues-----a bunch of those
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