Bypassed Rubber Hose
 

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I have recently purchased a 1994 Chevy Blazer Tahoe LT trim package. I noticed a rubber hose that comes up from behind the engine block and has it stuck into an old Gatorade bottle. I have the 4.3 Vortec engine. The previous owner cut out all the AC components and bypassed the power steering pump because the pump went bad. I've fixed the steering but can not find where this hose goes. It's a small rubber hose like a vacuum hose but it's been stuck in a Gatorade bottle. Any suggestions on what this hose is and where it connects. The little hose does have a black plastic nipple in the end of it.

If I had a 1st gen I think I could help you out. On a 2nd gen that looks to be in the area of the heater core. Hopefully someone will chime in soon that can give you an answer.

I have to check on mine.

Transmission/transfer case vent hose. More than likely a over heating transmission or a overfilled transfer case will spit fluid out there.

If the hose is for the transmission or transfer case in case of overheating, what is the hose suppose to dump into and if this is bypassed could it mean that I may have issues with the tranny or transfer case. I've driven it and it seems to shift fine.

It’s not to dump into anything. Fluid is not supposed to be in vent under normal conditions. Make shift catch can so to control fluid from leaking all over compartment and ground.

This will explain what’s happening.

Thank you all for the help. What kind of fluid would be needed for the transfer case. Anyone know. I'm gonna go ahead and change it.

Dextron fluid. And be sure you have a large enough catch pan. Pull the top plug first to verify that it is over full. BE CAREFUL things will get messy in a hurry if it is over full. You will need to change the input seal in transfer case.

When you disconnect the hoses from the vacuum switch on the transfer case check the inside of those hoses for fluid as well. They're supposed to be dry.

Great tip! Not sure if his model will be equipped with that switch. That switch was known as the vampire. Suck the fluid right out of the transfer case. :D

I'm a bit late with checking the OEM Manual. Correct about the hose.

This should be the vent to atmosphere of the "TRANSFER-CASE" vacuum switch.
Normally it is just the hose which has a clamp and a sponge cover. It is used as a vent.

There should definitively be no fluid coming out of there.

To make sure we do not mix up things here.

From front to back we have: ENGINE - TRANSMISSION - TRANSFER CASE

The transfer case is bolted together with the transmission and as previously stated a leaking seal could dump TRANSMISSION FLUID into the TRANSFER CASE.

The fluid for the TRANSFER CASE is also automatic transmission fluid.
Service manual says DEXRON IIE.

Is not the fluid a special kind if you have a "4-button" transfer case?

More recent blazes could be. The 94 is the last 1st gen. Electrically actuated Blazers have only one switch with two positions.

Manual says DEX IIE for the transfer case and DEX IIE or IIIE for the transmission on these Blazers.