Can some one help and tell me what ths is 97 Tahoe 5.7 l31

[Nad_Yvalhosert]

Ok thanks but why is there an on off switch I can turn?

It's not a switch, it's a quick disconnect to remove the upper part of the fitting. In case you break and need to replace it.
Or possibly to clean out the oil sludge that gets past the PCV valve.

 

[east302]

Probably #23 in the diagram below, 15971641 is the part number, seems like it is discontinued.

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1996 Chevrolet Tahoe Base 4DR HOSES & PIPES/HEATER PART 1-FRONT

Diagram of OEM HOSES & PIPES/HEATER PART 1-FRONT. Contains 8 parts priced between $9.57 and $52.94. Fits 1996 Chevrolet Tahoe Base 4DR.

www.wholesalegmpartsonline.com

Here is a similar thread.

Part number help!

Was in the process of replacing my fuel pressure regulator and I snapped the small plastic line that runs from firewall on the passenger side to what I believe is another sensor of some sort over by the TPS. I think is vacuum related Im not entirely sure. I just know its old and as I was trying...

www.gmt400.com

Sounds like others are have used vacuum tube/hose to replace it.

Looks like it is for controlling water flow to the heater core.

Best of luck.

I’d agree, vacuum hose should suffice if you cannot find one at a salvage yard. They’re specific to the Tahoe/Suburban; pickups didn’t have them.

When the hvac temp dial is in the “max” detent, the solenoid at the other end of that line energizes and the water valve (vacuum actuated) closes coolant off to the heater core to increase a/c performance. There’s a separate hose from the solenoid to the valve.

 

[Rebel511]

So I went to the salvage yard and got a bunch of hoses around the set size and connected them all to complete it and plug into the firewall, can I do am egr delete I heard it's better for the engine if so how easy is it? Would anyone recommend this?

 

[GoToGuy]

Off = remove

 

[Stringer]

i broke this hose recently too a few months ago (#23), on gmt800. i think after a half dozen pcv valve changes and being so old, it cracked. i could have probably been more careful with it too.

trying to find the part was hard, nobody makes an aftermarket for mine. had to get one at the dealer for $22.

i actually made my own with some hose i had, the rubber ends that came off old hose, a couple stainless ear clamps, and a new pcv valve. i still have the OEM one i need to throw in. mine works great tho.

 

[Rebel511]

It's not a switch, it's a quick disconnect to remove the upper part of the fitting. In case you break and need to replace it.
Or possibly to clean out the oil sludge that gets past the PCV valve.

So off is to remove it and it all comes out? How do you clean the inside?

 

[Rebel511]

i broke this hose recently too a few months ago (#23), on gmt800. i think after a half dozen pcv valve changes and being so old, it cracked. i could have probably been more careful with it too.

trying to find the part was hard, nobody makes an aftermarket for mine. had to get one at the dealer for $22.

i actually made my own with some hose i had, the rubber ends that came off old hose, a couple stainless ear clamps, and a new pcv valve. i still have the OEM one i need to throw in. mine works great tho.

This is the hose that broke the tiny one not even a quarter in it runs all the way to the firewall

 

[Nad_Yvalhosert]

So off is to remove it and it all comes out? How do you clean the inside?

I dont know. I've never needed to take it off, as I've never seen one plugged with goo.