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    [SOLVED] Underhood Intermittent Screech In Freezing weather

    I have never seen such system on any GM vehicle. Post the video link if you have it.
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    [SOLVED] Underhood Intermittent Screech In Freezing weather

    Silicone spray works as well and doesn't leave an oily residue.
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    2018 Tahoe riding rough??

    If it has the rear air suspension (Z95 I believe, or Z55), check to see if the air bladders still hold air and that the compressor runs 3 seconds after intial start of vebicle (or key on, engine off). Also, as those auto-ride shocks get old, the damping isn't as good and the ride gets clunky...
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    [SOLVED] Underhood Intermittent Screech In Freezing weather

    I had that last 2 weeks back with my 2008 in -20F. My assumption was it was an idler pulley or the PS pump hating life. It would go away after some driving most days. It was 10 days of sitting outside, frozen ass cold below zero mornings.......not a fan. When I got back home from my trip and...
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    Considering how GM screwed us with the oil, what about the ATF?

    That is correct about the first fluid GM used. The suspended moisture would cause the TC to grab instead of glide like it should. I had this done on my 2017 Denali. Worked awesome and done correctly is nothing to worry about. I've had 3 transmission flushes and 2 filter changes on my 2017 -...
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    What’s the consensus on the Duramax reliability?

    I asked my friend who is a 30+ year master GM mechanic about these motors. Mind you, he's the top tech in a busy shop that does ALL the hard, heavy, everything engine, diesel, and transmission work...... "The fuel economy is awesome and they are nice trucks.....if you're not the person who has...
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    Dead Tahoe - how to move it out of garage for tow truck?

    That's wild! I was gonna suggest crawling underneath and popping the cable off the trans shift shaft, but that is way better.
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    End of the road for the ol girl??

    If it's a cream puff, then an economical repair like a good used transmission from an auto recycler, and a few parts could be money well spent. If it's rusty, or used up in other areas, I'd take the money and find a new-to-you lower mile version.
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    2008 Yukon Denali Front Control arm bent, Maybe?

    Based on where you are located, I have some 160K factory take-offs from my 2008 Denali if you want a used one. Still in good shape, only replaced for minor ball joint play
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    45K Service - this seems excessive

    Look at the Severe service schedule of the manual and base it off that. At the 50k mark you are due for oil change, transmission service, transfer case fluid change, I'd recommend both diffentials (especially the front), maybe an air filter, and possibly a carbon removal treatment. If you are...
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    Another oil weight question

    I agree, don't overthink it. Just use a good full synthetic 5w-30 and run it. I use it in all my vehicles, and even in all the ones with 0w-20 on the cap with almost 200k trouble free miles - in temps from -25F to 100F. Works fine. Most GM commercial engines come with 5w-30......why...
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    How reliable are the 2011 Yukon Denalis?

    Good to know. I was wrong on my years of assumption.... better for OP then!
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    How reliable are the 2011 Yukon Denalis?

    It's a nice system that does need some maintenance with age. The air bags get dry rotted and then can leak. If not caught, then it can burn out the compressor. Keep the bags coated with something like fluid film seems to have worked well for me - no cracking ever. Front struts and rear...
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    How reliable are the 2011 Yukon Denalis?

    They are great trucks. If maintained well, many more miles of use can be expected. The AWD system is robust and not prone to issues (keep the transfer case and front differential serviced every 40 to 50k). They have the same AFM garbage that your 2009 Tahoe had, so keep the oil clean (5k max...
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    How to tell if engine heater is working?

    Generators have used these for years. There's no connection to anything PCM/BCM related. It's a temperature switch on the cord itself. Feedback is either through a direct contact temperature sensor with the coolant, or a proximity sensor for radiated temperature of the block. There are all...
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    Lost the 6.2 (was: May have Lost the 6.2)

    They will not be able to tell, nor would they care. If he's running 15w-40, then yes, you'll see some difference when dropping it, especially if it's not hot. But, for the normal oil being used, switching to a 0w-30, 0w-40, or a 5w-30 won't make a hill of beans to the lube tech. They don't...
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    2009-2014 6L80 better than 2015+?

    I believe the 8 speed was available in 2015 or 2016 in the Escalade and Denali. I love the 8 speed in my 2017. Combined with the 6.2, its just a fun combo to drive. GM transmissions can last a long time if serviced properly. Keep the fluid clean with 40 to 50k intervals, ditch the...
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    Oil pressure

    I had something similar happen recently on my 2008 Denali. Oil pressure dropped to below 20 after a highway drive when I got off for fuel. Left the truck running like always and heard a lifter start ticking.......on the way to a business travel meeting. Dang it! I brought the throttle up to...
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    Trans tuning

    If you find a good link, please share
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    Undercoating. Valugard?

    Looks interesting. Probably a similar product to Ziebart which has proven to be pretty good against corrosive elements. I like the lifetime warranty when applied to a new vehicle. If you keep them a long time, $1500 is cheap insurance IMO.
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    Trans tuning

    I have the same vehicle, and HP Tuners. I've found that changing the shift speed (mph) throughout the range (up/down) has yielded really good driveability improvements. I cut the TCC slip in half of what it was. The truck isn't trying to dog through the gears now to get into the highest...
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    Want to take my 2010 Yukon XL Denali with 180,000 miles for a family trip from Michigan To Florida

    That is oil coming from the rear engine cover gasket that also holds the rest main seal. I had identical looking oil on my 2008 and finally decided to order a new GM cover. You have to remove the transmission to do it. The cover seal gets flat and hard, then starts to weep. The rear main...
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    Using remote start bad for 5.3 engine?

    Ditto on all good relating to remote start. Not gonna hurt a thing. I usually do it so I can hear the exhaust bark, not because I Need to
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    possible bad rear diff? need advice

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    Lost the 6.2 (was: May have Lost the 6.2)

    Agreed. There was a reddit post about somebody's 2025 Denali that died at 23xx miles (or thereabouts) for the same reason as all the other 6.2L. They plastered a big sign to the rear window after getting it back saying date and mileage of failure as a warning to potential buyers - creative way...

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