Recent content by Geotrash

  1. Geotrash

    2011 Denali, no crank, has power, new starter

    Another common cause is internal corrosion in the battery cables. They look fine from the outside but have high internal resistance as a result. Search Big 3 upgrade here for the parts and smarts needed to fix. I've also seen rare cases of ignition switches failing with the same symptoms. I'd...
  2. Geotrash

    Cooling fans coming on max after cold engine start, stays on till engine shutdown

    Good thought. The fans were running like that on my 2012 so I replaced the coolant sensor with a genuine GM from Rock Auto, even though the gauge was reading correctly. Problem solved. He may have gotten a counterfeit sensor, or they sometimes ship with the pigtail and connector because they're...
  3. Geotrash

    Bigger brakes for GMT900 short of a C6 conversion kit?

    Is this the right kit for the front? https://www.rockauto.com/en/moreinfo.php?pk=10617128&cc=1502531&pt=13824&jsn=546
  4. Geotrash

    Cooling fans coming on max after cold engine start, stays on till engine shutdown

    In addition, I'm pretty sure that you can see the A/C system pressure during operation with a Tech2 or equivelent. Yes?
  5. Geotrash

    Cooling fans coming on max after cold engine start, stays on till engine shutdown

    And here are the diagnostic procedures: Cooling Fan Always On (without HP2) Diagnostic Instructions Perform the Diagnostic System Check - Vehicle See: Testing and Inspection\Initial Inspection and Diagnostic Overview\Diagnostic System Check - Vehicle prior to using this diagnostic...
  6. Geotrash

    Cooling fans coming on max after cold engine start, stays on till engine shutdown

    And here's a description of operation: Cooling Fan Description and Operation (Gas) Cooling Fan Control w/o HP2 System Overview The engine cooling fan system consists of 2 electric cooling fans and 3 fan relays. The cooling fan relays are arranged in a series/parallel (S/P) configuration...
  7. Geotrash

    Cooling fans coming on max after cold engine start, stays on till engine shutdown

    Here's a wiring diagram from a 2012 Yukon XL Denali that should be substantially similar:
  8. Geotrash

    Cooling fans coming on max after cold engine start, stays on till engine shutdown

    I'll try to find a flow chart for the factors impacting cooling fan speed on these. Pretty sure Alldata has one. Stay tuned.
  9. Geotrash

    2009 hybrid tahoe w/ 140k miles....... or 2014 tahoe lt w/ 170k miles... which would you take?

    :popcorn:
  10. Geotrash

    Towing

    Maybe so. But good knowledge of why the vehicle’s engineers set the towing parameters where they did, combined with good engineering knowledge and practice, can produce a modified vehicle capable of safely towing more than the original rated capacity. Keep in mind that the same frame and...
  11. Geotrash

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

    Yup. I believe it's the 2012+ Denalis that have Hill Start Assist (HSA).
  12. Geotrash

    Need opinions on keeping or moving on.

    It's almost always less expensive in the long run to repair an older vehicle that you've cared for than to buy a new one, if you can do the work yourself. If it's in good cosmetic shape and still meets your mission requirements, then the smart money is on repairing. Especially because yours is...
  13. Geotrash

    5.3 engine tick ONLY in Drive/Reverse

    Good news!! Thanks for following up!
  14. Geotrash

    Towing with 2021 Yukon Denali non-Max towing package

    I believe the only thing the max towing adds is the 'enhanced cooling radiator' for an extra 500 lbs of towing capacity. No idea what that is, exactly, because while the radiators have different part numbers, all of their physical dimensions and specs are the same. My guess is the difference...
  15. Geotrash

    Engine and gearbox swap from four speed to six or eight speed on 2008 Z71 ?

    Really, really cool to see. Our transmissions are enjoying peak aftermarket support, which benefits us in numerous ways.
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