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Discussion Starter · #1 ·
For some reason when I switch from defrost to blowing out the air vents....it wont switch back and forth. Any ideas? I just had the hubs and oem 4x4 parts swapped out for manual dynatrac 4x4 and was hoping that would also fix the vacuum issues but didn't. Any suggestions would be greatly appreciated.

05PSD6.0LCCLBSRW 42k Miles
 

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So when you switched to vents it stayed stuck there or after you shut off the truck for a while it switches back to defrost? If it was a small vacuum leak your pump would a lot longer when you first start up.
 

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Discussion Starter · #3 ·
Hey term 3.....yeah when the truck is running. If on defrost and switch to vents or floor or anything for that matter. It hesitates and most times doesn't switch. Sometimes if I crank the heat on defrost and switch to vents and then drop the temp it will switch occasionally. Its kinda frustrating
 

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I have a similar issue with mine too. It'll switch from defrost, it just takes a while. I'm interested in hearing how to fix it.
 

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Discussion Starter · #5 ·
Well I guess im glad that I am not the only one......please diesel gods give us the answers.....lol
 

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Discussion Starter · #6 ·
Well I'm gonna go see my truck guy tomorrow and see if he has any insight on my my vents still wont switch and why the subtract conversion is still making my front wheels clunk and knock like there still in 4 wheel drive.
 

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Any updates?
 

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Discussion Starter · #8 ·
my last post was supposed to say "Dynatrac" not subtract but obviously my SMART phone was too smart and changed it. No word yet....still waiting to hear from him. Im trying to be patient and wait till he calls me instead of constantly bugging him.
 

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The way I look at it, when my truck is in the shop is that it's MY money and I'll call them anytime I damn well want to. If they don't like it I'll take my business elsewhere. :)
 

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Discussion Starter · #10 ·
diamond plate....it turns out the vacuum keeps wanting to stay on constant. now it turns out with a 6.0L software update my acceleration is now making a fluttering sound.
 

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I bet when someone did the hubs they didn't block off the vacuum lines.
 

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Discussion Starter · #12 ·
holy $h!t jesilvas.....duh i never thought about that.....thanks man. You seemed to be way more knowledged then i am.....why is my truck with updated software making a fluttering sound out the pipe under medium + acceleration?
 

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Discussion Starter · #13 ·
have i mentioned before that i miss my 2000 7.3L? My problem was i drove the thing like a corvette and beat the snot out of it and had to bury her.....she took a licking tho.
 

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sometimes when i turn on the air conditioning it will go straight to defrost. when I switch it to a different position, say the front vent/foot well, i will occasionally hear a fluttering sound for a few short seconds and then it will make the change from the defrost setting.

It certainly sounds vacuum related. Like there is a leak somewhere and you cannot get the baffles to operate correctly.
Here's a thought - Could there be something in there blocking it? A mouse, or road debris, etc? that could keep the baffle from moving?
 

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diamond plate i would check the vacuum pump on your pass side inner fender to see if it is working, next check the vacuum selenoid right next to the pump to make sure it is sealed and not loosing all of your vacuum presure. next check the lines there arent very many just for your heater and 4x4 so if you have a leak those functions willbe slow or hesitant or not work.
 

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Discussion Starter · #16 ·
I finally figured what was wrong with mine. When I had the warn manual hubs install....they forget to disconnect the old auto hubs from the vacuum solenoid. But still for some reason my front hubs still clunk while turning and rolling forward or backwards. Any ideas?
 

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diamond plate i would check the vacuum pump on your pass side inner fender to see if it is working, next check the vacuum selenoid right next to the pump to make sure it is sealed and not loosing all of your vacuum presure. next check the lines there arent very many just for your heater and 4x4 so if you have a leak those functions willbe slow or hesitant or not work.
Thanks! I'll check it out.
 
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