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Old 07-31-2010, 18:25   #1 (permalink)
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Front AC dies when vacuum low

I have a 2003 Navigator that has an annoying AC poblem.
Whenever I accellerate (even slightly) all the air stops blowing through the front air ducts. When I am coasting o cruising at light load, the air blows just fine. Since these conditions correspond to low vacuum conditions, I assume that there is a problem with the vacuum accumulato or something similar. The poblem is that I cannot find any of the related vacuum components. I have the helm factory manual on disk. It shows pictues of all the componenets, but I cannot find anything that shows me where these components are located. I have other ford factory manuals and they have really good sections that diagram the location of components. Why doesn't this one?
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Old 07-31-2010, 18:34   #2 (permalink)
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Re: Front AC dies when vacuum low

The manuals don't show the location of the reservoir or the check valve. The only way to find them is to follow the vacuum lines from the engine to the firewall. The check valve can be bad too. It's supposed to hold vacuum in the circuit.
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Old 07-31-2010, 21:15   #3 (permalink)
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Re: Front AC dies when vacuum low

I have found the poblem, sort of.
I found some sort of vacuum switch on the fiwall next to the battery. It has a two pin electrical connector and two vacuum ports. On of the vacuum ports is plumbed into the vacuum line that goes to the vacuum reservoir (behind the battery). The vacuum switch leaks vacuum at all times. Even when the other port is plugged.
Does anyone know what this switch is?
It has a number on it "E8AE-9H465-BA
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Old 07-31-2010, 21:16   #4 (permalink)
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Re: Front AC dies when vacuum low

The vacuum reservoir is located under the battery/battery tray.


Electronic Automatic Temperature Control


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Old 07-31-2010, 21:21   #5 (permalink)
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Re: Front AC dies when vacuum low

From what I can tell that is a vacuum switch for the 4WD. Is your vehicle 4WD?
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Old 07-31-2010, 21:29   #6 (permalink)
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Re: Front AC dies when vacuum low

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From what I can tell that is a vacuum switch for the 4WD. Is your vehicle 4WD?
It is. I can also see that it seems to route vacuum to four lines, one for each wheel. So that seems to make sense.
I still cannot see exactly what thos vacuum lines go to though.
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Old 08-02-2010, 12:25   #7 (permalink)
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Re: Front AC dies when vacuum low

Yeah I would guess a vacuum line got unplugged accidently or something. Mine was doing that and it was the little vacuum line on the hot water valve there under the hood. I think it got unplugged when I was changing the sparkplugs or something. Have you had any work done on the truck lately? Like a tune up or something?


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Hot water supply valve .....
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Old 08-02-2010, 13:29   #8 (permalink)
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Re: Front AC dies when vacuum low

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The vacuum reservoir is located under the battery/battery tray.
JWKO, these diagrams are great! Where id you get them?
I have the factory manual on disk and it does not have most of your diagrams.
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Old 08-02-2010, 13:34   #9 (permalink)
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Re: Front AC dies when vacuum low

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Originally Posted by Hamfisted View Post
Yeah I would guess a vacuum line got unplugged accidently or something. Mine was doing that and it was the little vacuum line on the hot water valve there under the hood. I think it got unplugged when I was changing the sparkplugs or something. Have you had any work done on the truck lately? Like a tune up or something?

- Mike
Mike,
It turned out that my problem was the little vacuum switch that activates the diaphragms that connect the front axles in 4WD. It is on the firewall right behind he battery. I will post a pic later.
This vacuum switch just leaks continuously. I bought a new one at the ford dealer this morning. It cost about $50 and the new one does not leak.
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Old 08-02-2010, 13:48   #10 (permalink)
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Re: Front AC dies when vacuum low

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JWKO, these diagrams are great! Where id you get them?
I have the factory manual on disk and it does not have most of your diagrams.
They came from Alldata
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