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    AC blows warm in front, cold in rear, confused

    Stats: 205 psi high side, 45 psi low side (88 degrees ambient temp), Tech 2 has all switches showing good data, AC is enabled, all actuators showing they are moving to commanded position except recirc (has been bad for 8 years). Rear evaporator assembly, accumulator/dryer, orifice tube all...
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    Help me with part terminology and number, RE: refrigerant pressure switch

    I need the A/C refrigerant pressure switch for my 05 Yukon XL, it's the low pressure one located on the dryer. It seems the terminology of the high pressure and low pressure switches isn't being used consistently across vendors and I'm confused which one is being sold by various vendors. Some...
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    Anybody in the north treat for rust?

    The rubberized undercoat on my '05 is peeling off. I know it's trapping moisture and garbage. I'm thinking about getting it up on a rack or something and getting the underside pressure-washed/steam-cleaned then treating with a wax/oil based rust preventer like Fluid Film's lanolin based...
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    I need TPMS Help

    Out of my 2 sets of wheels (1 winter, 1 not-winter) I have 3 sensors bad. 2 are just low batteries. Are the batteries replaceable? I see some Ebay listings for used sensors come with a "service kit" but I thought you couldn't change batteries? If not, what part numbers will work? 11514379 like...
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    Used G80 have any value?

    I don't see how people are selling these things on ebay "Rebuilt GM G80" for $150 The rebuild kits are $200... unless they're not replacing all the parts... Some of them w/ R&P gears for $225... I have a fully functional G80 I pulled from my Yukon I thought about selling. The spider gears...
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    Rear Axle/Differential Rebuild AAR

    ETA, sorry for the length but I really wouldn't be putting this info here if I didn't feel it was important. Differential repair is a complicated process that some liken to "an art" This information is the result of many, many, many hours reading online forums etc plus a generous dose of...
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    Need new calipers, I don't know much about the various brands?

    Just need rear calipers for now but will likely replace fronts at some point. I'm not sure I trust the local brick & mortar stores to carry good quality parts anymore. Plus, I can get name-brand cheaper online than they charge for their "store brand"... Perusing rockauto shows me there are...
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    Question about ZW7 Smooth Ride (Nivomat) shocks

    My 2005 XL has ZW7 listed on the RPO codes. The shock absorbers are a smaller'ish diameter (maybe 2.25") and blue color. However, every time I've been to a scrap yard and found a vehicle with ZW7 suspension the shock absorbers are black and larger diameter. Previous to a few weeks ago all the...
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    When to know if axle-shafts need replaced?

    Vehicle: 2005 Yukon XL 4WD, 120k miles. BLUF: How do I know when it's time for new axle shafts? Details: A few weeks ago my differential carrier bearings went out. I pulled it all apart to replace the carrier bearings (and pinion bearings because metal found it's way up and started...
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    What MPG gain can be expected from a tune?

    I have a completely stock 5.3L Flex-fuel engine in a Yukon XL. 4l60E & 4.10 gears. Currently getting around 15-16 mpg. We do a lot of travelling, including interstate. It's not unusual for my cruising RPM to be around 2300-2500 depending on how much I'm pushing my speed. I think that's cutting...
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    Are rear brakes different from RWD to 4WD?

    This seems weird... I'm trying to get Akebono Pro-ACT brakes. I had good experience with them on other vehicles and I'm tired of the brake dust on my wheels so I want to install Akebono's. Akebono is listed as the OEM for the brakes and I know they're the OEM on a lot of brakes for GM. This...
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    Could this be indicative of a BCM failure?

    This has happened a few times now... Heated seats stop working intermittently (I'm assuming other things are problematic as well but it's the failure of the heated seats we notice). While the heated seats are not working I also have communication problems with my Tech 2 accessing and performing...
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    Found: Carseat tether bracket from 00-06 3rd Row seat

    My seat is missing this bracket (circled in the photo). I'm guessing that at some point the handle on our seat was removed, and when replacing it they forgot to put the bracket back on before the handle. The bracket is held on by only 1 bolt (same bolt that holds the left side of the seat handle...
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    PSA: Chilton Service Manuals E-library; you likely have free access to it

    I know many here need access to service manuals, diagrams, etc. While Chilton's may not be the best, its likely you have free access to it and didn't even know it. I have never used any other electronic shop manuals so I can't compare but I can say that navigating the Chilton E-manual isn't...
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    Cyclic surging while going downhill with cruise on?

    I've owned my Yukon XL for about a month now. Details: 2005 XL, 5.3L flex engine with GT5/G80 rear end, 116k miles Known: The rear end has some backlash in it; you can sometime hear a "clunk" when transitioning from brakes to accelerator. I'm certain it's in the carrier/spider-gears/locker and...
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    Is buying a Tech 2 worth it?

    I do all my maintenance, even transmission rebuilds (albeit I'm no expert there). Having used my brother's snap-on brick to help troubleshoot my 98 Sierra I got accustomed to being able to do more than read gauges and clear codes. But I had to give that back (and he lives over 3 hrs away so it's...

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