Here¹s something I don¹t imagine you see every day...

I have a 95 4.3W series Jimmy that has been Œleaking¹ transmission fluid
(might be brake fluid but I don¹t think so based on the deep pink colour and
smell) - it¹s collecting in the under-the-hood vac reservoir Œball¹.

Can someone explain to be what might be happening?? Both the motor and
transmission are nearly brand new but I¹d like to know what to Œchat¹ about
when it goes in for the warranty work if needed.

It seems like it¹s been a little low on transmission fluid lately and I
can¹t find any leaks in the pan, cooler, or lines * except today when I
checked a host going to that vac booster ball and found the pink stuff.

I am stumped but it wouldn¹t be the first time.

Thanks and take care,
Andrew.

I know you¹re all thinking that it¹s just a simple matter of an overfilled
transmission... I¹m not sure it¹s that simple. I will triple check it but
I don¹t think the fluid level is too high. Maybe some hard braking caused
the fluid to travel up the vent line? Is that possible??

Thanks.
Andrew.

"AWN" wrote

This is a bit of a guess, but it's not uncommon for the transfer case
switch that controls the front diff engagement (I'm assuming this is
a 4x4, though you didn't specify that) to suck fluid from the
t/case up through the vacuum lines. It's also not uncommon for
the transfer case front seal to suck transmission fluid from the
automatic into itself. Both the transmission and the t/case in
that year use the same fluid.

You might try checking the fluid level of the t/case. If it pours
out of the fill hole, then I'd say that you may have two repairs you
will need to do. Replace the front seal on the t/case, and replace
the switch on the t/case. By the way, the oil coming up through
the vacuum lines will often destroy all of the vacuum lines, including
the ones in the dash that control your heater and a/c blend doors.

Ian