Hey everyone,

Currently I'm working on my brother's 93 4wd 4.3L S10 Blazer. It was running rough even after replacing the cap, rotor, plugs, wires, PCV, air and fuel filters so I decided I needed to replace the vacuum lines as they were cracking. Well I'm afraid I may have crossed a few of the lines to the transfer case and now I have some extra lines and one has trans fluid coming out of it. If I leave these vacuum lines off of the transfer case until i can get them sorted out, will it affect the trans in any way (besides obviously not having 4wd)?

Any help would be greatly appreciated!!

Thanks in advance,
Colin

 

If there is transmission fluid coming out of one of the lines, then you have a combination of problems. You likely have a failed input seal on the front of the transfer case as well as a failed transfer case vacuum switch. If you remove the fill (upper) plug from the back of the transfer case and transmission fluid pours out, then front seal is bad.

As far as disconnecting things goes, you should be fine to disconnect and plug the vacuum supply to the transfer case, but be sure not to disconnect the vacuum supply to the HVAC module.

Oh yeah, THIS POST should help you out. It shows the vac diagrams for a 94 which should be almost identical to your 93.

 

Thank you for your help. One thing those diagrams dont show is how the lines break up once theyre under the truck. What I mean is, I have a Y-shaped vacuum splitter and a 3 port triangular vacuum connector that is on top of the transfer case. I'm not sure how this is supposed to be hooked up either so again, I'd really appreciate your help.

Thanks,
Colin

 

In my experience, that hose coming off of the top of the transfer case does get hooked up to the Y shaped adapter you are speaking of. I had my blazer for 9-10 months and just found out that my transfer case vaccum line was never connected. It didnt seem to make a difference as shifting into 4 wheel drive still worked, just took a little longer