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  1. C

    Keeping coolant and transmission temps under control when towing in the summer heat

    What temp thermostat are you running? That was my next update, I had a shop change mine out with the water pump and they just put the OEM temp in.
  2. C

    Keeping coolant and transmission temps under control when towing in the summer heat

    So I towed my camper (4k lbs) again this weekend 2.5 hours away in the hills of Kentucky and it did fine without running the A/C, stayed around 210, peaked at 220 on some larger hills. When I run th A/C it does significantly worse, stays hot around 220 and will go up to 230. Is there a chance...
  3. C

    Keeping coolant and transmission temps under control when towing in the summer heat

    Do you guys know is the electric fans turn off over a certain speed?
  4. C

    Keeping coolant and transmission temps under control when towing in the summer heat

    Seems like it should be similar spinning at 3000 RPMs on the highway versus doing 35 miles per hour. At least for the engine's sake.
  5. C

    Keeping coolant and transmission temps under control when towing in the summer heat

    Yes, I fashioned some of my own, after the OE ones disintegrated, from a yard sign just like another member here.
  6. C

    Keeping coolant and transmission temps under control when towing in the summer heat

    I did some moderate hills yesterday pulling my 5000lb camper and my engine temp reached 237 and it was about 100 outside. My trans temp reached a max of 208 so I'm not worried about that, just my engine temp. The rest of the trip I ran with no AC and it peaked around 220. I have a Derale...
  7. C

    Keeping coolant and transmission temps under control when towing in the summer heat

    Are you running the A/C as well with those numbers?
  8. C

    Keeping coolant and transmission temps under control when towing in the summer heat

    Mine is mounted in the stock location in front of the radiator.
  9. C

    Keeping coolant and transmission temps under control when towing in the summer heat

    I've been following this thread as I have a fairly new to me 2008 Denali that has been running hot (engine) while towing my 4500lb travel trailer. I've changed the water pump, thermostat, swapped the radiator for a cold case two core and hooked up the oil and transmission cooler lines, added...
  10. C

    2007 GMC Denali stalls after towing

    Have you solved the issue by switching to a thinner oil?
  11. C

    2007 GMC Denali stalls after towing

    2008, when I tow I constantly watch my torque app which has oil pressure and temperature. When cruising, pressure stays around 38 to 40 PSI, when idling it stays anywhere between 15 to 20. Oil temperature was running usually between 230 to 240.
  12. C

    2007 GMC Denali stalls after towing

    I have one albeit not the 40k trucool, it's a derale about half the size.
  13. C

    2007 GMC Denali stalls after towing

    I signed up here after googling this issue, I'm experiencing the same issue when towing a 4000lb camper. Has anyone found a sure solution? Does anyone agree with the guy above to replace the PCB?

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