No A/C in 4x4 - Ford Powerstroke Diesel Forum
 
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post #1 of 6 Old 10-09-2011, 10:26 AM Thread Starter
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No A/C in 4x4

Weird issue....if I have my A/C on and put the truck in 4x4 it automatically switches A/C to defrost and blows vent air instead of cool air. A/C and 4x4 otherwise work fine. Is this still an issue with the vacuum lines and if so, is there a specific line to check that would cause this? If not, where should I start my search to fix this? Thanks

2000 PSD CCSB 4x4, Skyjacker lift on 35's, muffler delete, 6637 intake, Edge Juice w/Attitude, AIH delete plug, HPOP Crossover, Boost Tube, MAP overboost valve, '03 Side mirros, '03 headlights, Frontier Extreme front bumer, Ranch hand rear bumper, 7" K/C aux. driving lights, moderate stereo system

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post #2 of 6 Old 10-09-2011, 10:48 AM
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Vacuum. Check lines going to front hubs. See if the vacuum pump even works.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
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post #3 of 6 Old 10-09-2011, 11:12 AM Thread Starter
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Thanks, I'll do that! Kinda figured it might be vacuum lines, but nothing I've read had exactly the same problem as mine

2000 PSD CCSB 4x4, Skyjacker lift on 35's, muffler delete, 6637 intake, Edge Juice w/Attitude, AIH delete plug, HPOP Crossover, Boost Tube, MAP overboost valve, '03 Side mirros, '03 headlights, Frontier Extreme front bumer, Ranch hand rear bumper, 7" K/C aux. driving lights, moderate stereo system

Next on the list: 37" tires
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post #4 of 6 Old 10-10-2011, 09:52 AM
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I had a autohub $hit the bed so I just installed Warn lock outs. vacuum issues no more!! plus the vacuum actuator was junk. so I just bypassed it and ran the vacuum from the venting to the vacuum box. Works like a charm now.

2000 F-250 XLT Crew cab 4x4
DIY air intake
Straight exhaust to 5" mitre stacks
Stancor GPR
Tru-Cool Max trans cooler
Phantom II Boost, trans temp and Pyro gauges
Zoodad
Foil delete
2005 grille conversion
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post #5 of 6 Old 10-10-2011, 01:42 PM
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I had the same problem with mine a while back. This is what I did:

I started with the hubs and found that both of my lines were broke so I replaced them. Then I when in to the engine bay and found the vacuum lines on the passenger side fender wall. On the bottom of the vacuum actuator there are two lines coming off of it. One runs in to a t and then in the canister. The other one runs south to a t on the frame rail and then to your hubs. I could almost bet that there is a leak between your hubs and the actuator or your actuator is bad.

I took the two lines off of the bottom and plugged the bottom one (this is the line that runs to your hubs) with a rubber glove that i had in the truck, waited about a min or so a boom I now have ac coming out of the vents not the defrost. I hope this helps here is also a picture of the vacuum actuator.





2000 F250 7.3l, 20" KMC XD-Series wrapped in 35" Toyo MTs
5" exhaust, Edge CTS Programmer (just for gauges), DP Tuner, FRX, 6637 intake.
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post #6 of 6 Old 10-10-2011, 03:50 PM Thread Starter
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That's awesome! Very detailed response and very helpful. Thanks alot bboysen!!

2000 PSD CCSB 4x4, Skyjacker lift on 35's, muffler delete, 6637 intake, Edge Juice w/Attitude, AIH delete plug, HPOP Crossover, Boost Tube, MAP overboost valve, '03 Side mirros, '03 headlights, Frontier Extreme front bumer, Ranch hand rear bumper, 7" K/C aux. driving lights, moderate stereo system

Next on the list: 37" tires
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