What did you do to your NNBS GMT900 Tahoe/Yukon Today?

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I have a set of Appion 1/4" and 5/16" core removal tools used for home hvac/mini splits. They have replaceable o-rings and also work under vacuum so you can pull vac quicker and replace the core without loosing vac. I wonder if they make the quick connect adapters so they can be used on automotive ac systems.
 

Geotrash

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Yup, that's the one I ordered:

MASTERCOOL (81490) R134A Valve Core Remover Installer​

Google a bit and you can find it elsewhere, and for a little less. There is another brand that operates on the same principle. I'll try to find the video to show how easy it is to use. This is the other, similar tool, and the process is the same:


One video was an AC repairman, and he said he replaces the Schrader valve cores every time he services an AC system. Funny, I'm old as dirt, have had a lot of leaking AC system, and this is the first time I've heard about this.
So it arrived a half an hour ago and it was a total fail. I couldn’t get the quick connect fitting to stay seated on the port nipple. It kept popping off even when I had the core remover fully retracted. And yes, I was using the correct red one for the high pressure port. Super frustrating. Glad I didn’t cancel my appointment for Monday.
 
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I checked my catch can this afternoon. I haven't checked it since I changed the oil and filter since last June/4k miles ago and OLM is currently at 30%. I usually check it halfway through an oil change cycle, but just forgot to with the holidays and all. Well it was pretty full of light brown thick gunk. It wouldn't even drain out the valve on the bottom, I had to take it apart and clean it out. I might look into mounting it closer to the engine instead of way over by washer fluid reservoir. I think with it farther away it gets more condensation inside.

I'm curious now, what if it was full enough to actually block the PCV flow going to the intake? Would it cause a bit of rough idling and even cause oil leaks? I'm wondering if the oil leak I'm chasing that I thought was from the oil cooler blockoff area above the filter is actually coming from the PCV hose connection on that valve cover right above the oil cooler blockoff. It looks like there's some residue back there below that area near that back spark plug wire/coil
 
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Well I totally removed the catch can so I could drain and clean it out. I noticed one of the 3/8" hoses going to the catch can had some cracks/dry rot at the nipple/fitting so I just put the OE PCV pipe back on for now until I get some new hose. I notice the slight rough idle I've been getting lately is gone.
 

OR VietVet

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Yup, that's the one I ordered:

MASTERCOOL (81490) R134A Valve Core Remover Installer​

Google a bit and you can find it elsewhere, and for a little less. There is another brand that operates on the same principle. I'll try to find the video to show how easy it is to use. This is the other, similar tool, and the process is the same:


One video was an AC repairman, and he said he replaces the Schrader valve cores every time he services an AC system. Funny, I'm old as dirt, have had a lot of leaking AC system, and this is the first time I've heard about this.
Read the ratings on this tool for details
 

Sparksalot

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Yup, that's the one I ordered:

MASTERCOOL (81490) R134A Valve Core Remover Installer​

Google a bit and you can find it elsewhere, and for a little less. There is another brand that operates on the same principle. I'll try to find the video to show how easy it is to use. This is the other, similar tool, and the process is the same:


One video was an AC repairman, and he said he replaces the Schrader valve cores every time he services an AC system. Funny, I'm old as dirt, have had a lot of leaking AC system, and this is the first time I've heard about this.
Nice find!
 

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