O STAP!! No 4x4!! - Ford Powerstroke Diesel Forum
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post #1 of 31 Old 01-27-2010, 12:43 PM Thread Starter
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O SNAP!! No 4x4!!

I got a 99 super duty 7.3. It has the automatic switch on the dash and when I go to engage it the 4x4 wont come up. Also my air/heat only works thru the defrost. I was told this was a vac pump promlem, so I replaced it this morning and it still does the samething. I took a test light to all my fuese under the hood.( Did I miss a fuse somewhere or a relay) I have no owners manual. I pulled out the switch on my dash and took a test light to it and there is no power going to it. I need help quick, a diesel wont go no where in the mud.... thanks

Last edited by 99strokinandsmokin; 01-28-2010 at 07:44 PM. Reason: spelling
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post #2 of 31 Old 01-27-2010, 01:39 PM
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Maybe you're just leakin all that vacuum your new pump makes with a bad hose somewhere.

Have you checked the hoses at the top of each front hub? They are commonly bad at where they plug-in to the hubs. Recut and attach and look for other vacuum leaks...
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post #3 of 31 Old 01-27-2010, 01:43 PM
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Check ALL of your vacuum lines, ESPECIALLY the ones that run from the fender well down to the nipple on top of the hub

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post #4 of 31 Old 01-27-2010, 02:16 PM
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generally your air will go to defrost when you switch to 4x4 because your hubs and air are running off the same vacuum pump... you lose pressure in your resivouir (cant spell) which switches your hubs to engage and when that happens your defrost is the lowest pressure so it switches to defrost for i think 1-2 min till you get the pressure built back up... hope this helps... kinda confusing... and yes.. check hoses

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post #5 of 31 Old 01-28-2010, 05:57 PM Thread Starter
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So today I checked all Vac lines and no leaks found but my vac pump still runs all the time. Now my windows wont work and my wipers wont work, so I must have shot something wihile I was working on it, but none of the fuse's are shot under the hood and under the stering wheel. Any ideas??
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post #6 of 31 Old 01-28-2010, 06:00 PM
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No power to switch. Hmmmm power windows acting up hmmmm, sounds to me like you should be looking at your General Electrical Module.


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post #7 of 31 Old 01-28-2010, 06:07 PM Thread Starter
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where is that?
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post #8 of 31 Old 01-28-2010, 06:19 PM Thread Starter
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G.E.M.

Ok I found out what it is... Now where is it at.....

What is a Generic Electronic Module?
The Generic Electronic Module (GEM) is found on Ford vehicles and is basically a Body Control Computer. It controls many of the following functions on most Ford vehicles:

Warning chimes and warning lamps
One-touch down driverís side window
Daytime Running Lamps
Heated rear window
Windshield washers and wipers
Battery saver
Remote keyless entry
Illuminated entry with remote keyless entry
Interior lighting
Perimeter anti-theft
Four-wheel drive
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post #9 of 31 Old 01-28-2010, 06:26 PM
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Should be under the dash behind the glove box.


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post #10 of 31 Old 01-28-2010, 07:24 PM
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Heater controls
Read this hope it helps...if you still have the auto hubs you will want to replace that vacuum switch on the inner funder we are talking about in the thread.
Let us know if that gets it.

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