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post #1 of 8 (permalink) Old 04-14-02, 05:23 PM Thread Starter
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XF Air vents problem

My dad has an XF that is having problems with the airvents. In the morning he switches the air so it can demist the front windscreen. As soon as he puts the car in drive the air starts coming out of the face (front) vents. It doesnt have A/C and its an auto. Does this sound like an electrical problem?
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post #2 of 8 (permalink) Old 04-14-02, 05:32 PM
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It'll be a vacuum proplem as all the vents are vacuum operated. How does the car run???
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post #3 of 8 (permalink) Old 04-14-02, 06:28 PM Thread Starter
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It's an old car with high millage, so it's not at its best.

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post #4 of 8 (permalink) Old 04-14-02, 06:35 PM
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Dont the XF's default to demist upon vacuum loss??

Run Forrest , Run.......
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post #5 of 8 (permalink) Old 04-14-02, 07:14 PM
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Jesmol : Yes it does default to demist when no vacuum.

Aussie Falcon : Pull out the glovebox and behind you will see a lot of pretty coloured piping. Make sure this is plugged in properly. If thats ok then check in the engine bay to make sure all vacuum pipes are correctly plugged in and if they are, check to see if there clogged or not. Failing that it is fairly easy to remove the vent control fascia. Remove all the knobs and then remove the black panel. Now you will see 3 screws I think. Just remove these and then it willl pull out. Check to see that all the vacuum pipes here are plugged in tightly.

Failing that I don't know....

Cheers
Matt

EL driver...
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post #6 of 8 (permalink) Old 04-14-02, 07:23 PM Thread Starter
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Thanks for the suggestions, I'll give it a go

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post #7 of 8 (permalink) Old 04-14-02, 09:34 PM
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Quote:
Originally posted by xf_xr6
Jesmol : Yes it does default to demist when no vacuum.

Aussie Falcon : Pull out the glovebox and behind you will see a lot of pretty coloured piping. Make sure this is plugged in properly. If thats ok then check in the engine bay to make sure all vacuum pipes are correctly plugged in and if they are, check to see if there clogged or not. Failing that it is fairly easy to remove the vent control fascia. Remove all the knobs and then remove the black panel. Now you will see 3 screws I think. Just remove these and then it willl pull out. Check to see that all the vacuum pipes here are plugged in tightly.

Failing that I don't know....

Cheers
Matt
If the system does fail to demist, then the problem shouldn't be caused by a loose connection etc, most likely to be caused by a faulty switch in the dash, ie the leftmost switch to change the air dist outlet...My thoughts anyway....

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post #8 of 8 (permalink) Old 04-14-02, 11:52 PM
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This sounds like the good ole one way valve problem, when the revs rise, more vacuum goes to the vacuum motors, when revs drop, so does the vacuum and the motors move again.

I forget where the 1 way valve is, but as long as no leaks exist, you can place a new one in the vacuum feed line from the inlet manifold, should only be a few $$ from an auto parts store.


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