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post #1 of (permalink) Old 09-02-2003, 03:39 PM Thread Starter
esm
 
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Vacuum problem?

Hi Y'all,

I have a 96 XLT/302 that seems to have a vacuum problem. When I have the fan blowing air out of the dashboard outlets, the air flow switches to the windshield outlets as soon as I go uphill, indicating loss of vacuum (the windshield outlets are the defaults when no vacuum is present). Is there anyone out there with the same symptoms? Any suggestions?

Thanks,

Ed
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post #2 of (permalink) Old 09-02-2003, 04:04 PM
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Re: Vacuum problem?

Ed, I have a different problem from you. My a/c fan would suddenly stop blowing air. But as soon as I "wiggle" the fan outlet, it blows again. Weird.

John
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post #3 of (permalink) Old 09-02-2003, 04:58 PM
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Re: Vacuum problem?

<font color="blue">esm</font color>:
Check out this thread. It should answer your question.
In addition, see <font color="blue">Steve83</font color>'s hints.
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post #4 of (permalink) Old 09-03-2003, 12:28 PM Thread Starter
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Re: Vacuum problem?

Okay, I'll check for vacuum leaks. I don't think it has anything to do with the compressor shutting off, because it still blows cold, it just blows through the wrong (defrost) outlets.

Thanks guys,

Ed
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post #5 of (permalink) Old 09-03-2003, 10:20 PM
 
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Re: Vacuum problem?

Sounds like your vac can is bad.....
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post #6 of (permalink) Old 10-09-2003, 05:28 AM
 
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Re: Vacuum problem?

there is a check valve in the vacuum sorce to your ac/heater controls, when you go uphill wot the engine vacuum drops to near 0. The check valve is there to keep the vacuum motors from switching, providing no leak after the valve or controls. [img]images/graemlins/40BEER.gif[/img]
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post #7 of (permalink) Old 10-11-2003, 12:23 PM Thread Starter
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Re: Vacuum problem?

Can someone give me a hint where this check valve is located? Thanks, Ed
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post #8 of (permalink) Old 10-11-2003, 04:20 PM
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Re: Vacuum problem?

standing in front of the bumper, look to the left of the engine back by the firewall. there is a big black box that houses the a/c components, and it has a couple tubes going into it. on the right side of the big box is a little box, which is the vac reservoir for the climate control system. you'll see a vacuum hose coming off the top of it, which joins another hose at a right angle... the right side of this 2nd hose goes to manifold vacuum and the left side goes to the a/c control panel. the check valve is right there at the junction of the 2 (really 3) vac lines.
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post #9 of (permalink) Old 10-15-2003, 10:49 AM Thread Starter
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Re: Vacuum problem?

Found it, thanks!
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