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01 Taurus, Wont blow AC out of the Vents..

6K views 2 replies 2 participants last post by  Spieldawg 
#1 ·
Hello all,

Hopefully you guys can help me out, I have a problem with the AC and Heat, not blowing out of the normal upper vents in the dash. Whenever, I place the switch to blow out of the top vents, it blows out of the defroster. I move it to blend, upper and lower vents, its still blowing out of the defrosters, and the floor. and of course the floor is working still too.

I looked at the vacuum lines, and I didn't see anything obvious, but I couldn't see where the actuator is to control the door that shuts off the defrosters... and I couldn't get the radio out, to take the trim pieces apart.

Anyone ever experience this before?


Thanks,

--Scott
 
#2 ·
Ok. Start under the hood by disconnecting the vacuum source line (the one coming from the engine) from the check valve which is clipped to the right cowl screen. Check the vacuum of the line removed with a vacuum gauge. No vacuum check the source line back to the intake. If there's vacuum present, next reconnect the source line and disconnect the other lines on the check valve. Check vacuum here. No vacuum on one or the other replace the check valve. If there is vacuum you have to check the check valve with a hand vacuum pump on both of the previous ports (not the source port). If no vacuum can be pulled replace the check valve. If there is vacuum vacuum test on the line going to the reservour. If there is no vacuum disconnect the line going to the reservour (You'll have to remove the R.F. splash shield to get at it) and vacuum test the reservour. no vacuum means replace the reservour. If it has vacuum replace the line going to the reservour. If there was vacuum testing the line going to the reservour then test the function selector switch. Go this far testing and if everything checks out ok to this point I will detail the rest of the test for the selector switch and vacuum motors per request.
 
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