4 wheel drive problem - Ford Powerstroke Diesel Forum
 
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post #1 of 10 Old 11-08-2011, 04:50 PM Thread Starter
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4 wheel drive problem

Hey guys! I have an 05' 250 SD FX4, when I turn my switch to the 4 wheel position, the AC turns off and it switches to the defroster... WTF??? It has to be some sort of Vacuum leak, but where do I start? Maybe someone has had this problem and can tell me how to fix it...



--Johnny--

'05 F250 Crew Cab, Lariat, FX4,
8" lift Fabtech 4 link
37" Toyo Open Country MT
'03 Turbo
Edge Insight CTS, SCT X3
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RCD EGR delete
STC fitting update
Dummy plugs/Standpipe update
blue spring mod
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post #2 of 10 Old 11-20-2011, 03:45 AM
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This has been covered in many threads, try the search feature. Not trying to be an ***, but allot of dialog in these threads covering this very issue and some have pics. Mine has the same problem, I simply plugged the vacumm line that goes to the front axle and utilize the manual engagement of hubs.

There are some large O rings on the inside of your front hubs that help a vacuum when you engage your 4x4. It will pulse a then automaticly pull your lock portion of the hub in. These O rings go bad on the inside of the hub and don't allow the vacuum to hold. So when you do this is throws your whole vacuum system off which in turn operates the A/C.

Trace the vacuum line up from your axle. Where it ties into the vacuum system on the passenger side of the engine compartement. You will see the little vacuum pump mounted behind the battery. Just pull the line from your axle where it T's in, and put a cap on this. Your A/C will work fine, but you will need to hop out and manually engage your hubs. Till you can get your O-Rings fixed.

Hope this helps.

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post #3 of 10 Old 11-20-2011, 07:10 AM Thread Starter
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Thanks buddy! I'm pretty new to this forum stuff and always forget about the search option. I will check into that issue. Much appreciated. P.S. GO TIGERS!!!!!!!!!!



--Johnny--

'05 F250 Crew Cab, Lariat, FX4,
8" lift Fabtech 4 link
37" Toyo Open Country MT
'03 Turbo
Edge Insight CTS, SCT X3
ARP head studs
RCD EGR delete
STC fitting update
Dummy plugs/Standpipe update
blue spring mod
CCV mod
Zoodad mod
High Idle Mod
Cab light install
4" Turbo Back W/ 5" tip
Airaid

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post #4 of 10 Old 11-21-2011, 04:05 AM
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Check the vacuum line line where it fits onto the nipple on the axle. Quite often, you'll find that the rubber hose has just deteriorated allowing the vacuum to leak there. Trim and refit; replace with a new rubber hose, or better yet, replace with a stainless braided hose and not have to worry about it again.

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post #5 of 10 Old 11-21-2011, 05:18 AM Thread Starter
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Quote:
Originally Posted by Davey~do View Post
Check the vacuum line line where it fits onto the nipple on the axle. Quite often, you'll find that the rubber hose has just deteriorated allowing the vacuum to leak there. Trim and refit; replace with a new rubber hose, or better yet, replace with a stainless braided hose and not have to worry about it again.
Hmm! I'll check into that today... Thanks man!



--Johnny--

'05 F250 Crew Cab, Lariat, FX4,
8" lift Fabtech 4 link
37" Toyo Open Country MT
'03 Turbo
Edge Insight CTS, SCT X3
ARP head studs
RCD EGR delete
STC fitting update
Dummy plugs/Standpipe update
blue spring mod
CCV mod
Zoodad mod
High Idle Mod
Cab light install
4" Turbo Back W/ 5" tip
Airaid

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post #6 of 10 Old 11-22-2011, 01:47 PM
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Quote:
Originally Posted by Davey~do View Post
Check the vacuum line line where it fits onto the nipple on the axle. Quite often, you'll find that the rubber hose has just deteriorated allowing the vacuum to leak there. Trim and refit; replace with a new rubber hose, or better yet, replace with a stainless braided hose and not have to worry about it again.
That's a good idea, I totally forgot to mention checking the hose down to the axle. And I like the idea of the stainless braided hose...

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post #7 of 10 Old 12-04-2011, 08:32 AM Thread Starter
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So today I was under my truck and I noticed what appears to be a seal just hanging loosely on the front axle. This is like this on both sides. Are these seals or are these just dust shields? Maybe this is why I'm having 4WD issues??? I took a pic of it, maybe y'all can help with this one...
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--Johnny--

'05 F250 Crew Cab, Lariat, FX4,
8" lift Fabtech 4 link
37" Toyo Open Country MT
'03 Turbo
Edge Insight CTS, SCT X3
ARP head studs
RCD EGR delete
STC fitting update
Dummy plugs/Standpipe update
blue spring mod
CCV mod
Zoodad mod
High Idle Mod
Cab light install
4" Turbo Back W/ 5" tip
Airaid

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post #8 of 10 Old 12-04-2011, 08:40 AM
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Every superduty ever produced will do that. They have an updated seal...motorcraft.

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post #9 of 10 Old 12-04-2011, 08:43 AM Thread Starter
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So is this why my 4wd isn't working properly?



--Johnny--

'05 F250 Crew Cab, Lariat, FX4,
8" lift Fabtech 4 link
37" Toyo Open Country MT
'03 Turbo
Edge Insight CTS, SCT X3
ARP head studs
RCD EGR delete
STC fitting update
Dummy plugs/Standpipe update
blue spring mod
CCV mod
Zoodad mod
High Idle Mod
Cab light install
4" Turbo Back W/ 5" tip
Airaid

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post #10 of 10 Old 12-04-2011, 05:53 PM
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Quote:
Originally Posted by SynysterHD View Post
So is this why my 4wd isn't working properly?
No you have another problem. Whats dangling on the axle shaft is the dust seal that is supposed to protect the oil seal, which is the half that is still in place.

05 XLT SD
Regular Cab
6spd 4x4
Full K&N
MBRP exhaust
Cat deltete
Egr delete
Blue fuel spring
Updated turbo lines
Archer antifreeze
Coolant Filters
ficmrepair.com ficm
DC Power Alternator
ScanGuageII
Ford Filters
Ranch hand GG
Winkel flatbed
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