Understanding routing of 4x4 vacuum lines
#1
Understanding routing of 4x4 vacuum lines
Working on a 99 TB, the 4x4 vacuum lines are in pathetic shape and will start replacing today. I don't understand what I am seeing compared to what I have been reading here... I have NOT been under the truck yet, this is just an up top observation.
I removed the battery tray and located the actuator; it moves freely but have not tested it with power yet. Began tracing vacuum lines there. Instead of trying to describe what I see, I attached a drawing to reference... What I am confused about is:
1) What is the device on the firewall with two vacuum lines and two wires? Some kind of switch or solenoid?
2) Any idea why a vacuum hose would be running into the drivers side fender well area? I cant see behind there yet; it's buried behind the (I think ABS crap).
3) The line going into a big loom and into the firewall is a different kind of line... it's almost like hard plastic and much smaller diameter. Does this sound correct?
I removed the battery tray and located the actuator; it moves freely but have not tested it with power yet. Began tracing vacuum lines there. Instead of trying to describe what I see, I attached a drawing to reference... What I am confused about is:
1) What is the device on the firewall with two vacuum lines and two wires? Some kind of switch or solenoid?
2) Any idea why a vacuum hose would be running into the drivers side fender well area? I cant see behind there yet; it's buried behind the (I think ABS crap).
3) The line going into a big loom and into the firewall is a different kind of line... it's almost like hard plastic and much smaller diameter. Does this sound correct?
Last edited by dhud64; 01-26-2015 at 09:58 AM.
#3
Okay, so I got all the 4x4 related vacuum lines under the hood replaced. I crawled underneath and did not see a switch on the T-case with three vacuum lines, but there is something on top in the rear that I cant even really see. So, does the switch I described on the firewall replace the switch on the T-case, or is that what I can barely see?
After replacing all the vacuum lines I went for a short drive. I tested the switching of 4 low to 4 high and automatic, that seems to work okay, however, after driving a bit in auto and 4 high (on gravel), I had a hard time getting it out of 4x4, any ideas? I finally did get it out of 4x4, but not sure what the combination was...
After replacing all the vacuum lines I went for a short drive. I tested the switching of 4 low to 4 high and automatic, that seems to work okay, however, after driving a bit in auto and 4 high (on gravel), I had a hard time getting it out of 4x4, any ideas? I finally did get it out of 4x4, but not sure what the combination was...
Last edited by dhud64; 01-26-2015 at 03:48 PM.
#4
On a 99 TB is this the correct routing for the vacuum hoses? I recently replaced vacuum lines and question my memory. It appears in this picture the hose on the top port runs to the actuator under the battery. However, I believe I googled another picture and it showed the opposite. Does it matter?
http://i115.photobucket.com/albums/n...t/DSC03018.jpg
Thanks!
http://i115.photobucket.com/albums/n...t/DSC03018.jpg
Thanks!
#6
So I'm pretty sure these hoses were hooked up backwards when I bought it... What would be the consequences of that? Any damage to check for or anything to reset? Thanks!
Last edited by dhud64; 02-02-2015 at 07:42 AM.
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