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By GMCustomerService · Posted
Thanks for bringing your HVAC concerns to our attention. For further assistance, please fill out the form at https://s.gmc.com/support-request with all pertinent details so your concerns get routed properly. Kindly include your username along with additional details regarding your truck's AC concerns. -
By GMCustomerService · Posted
We can understand your frustration and our team would like to assist further in the best way possible. Please fill out the form at https://s.gmc.com/support-request with all pertinent details. Be sure to include your username along with additional details regarding your HVAC system. -
//// Luckily here also--I have a ;local independent shop that will service my vehicle with my supplied fluids. I'm to old to lay on the ground and do it anymore. The m Shop owner and his Son have been friends for years and we were both in the towing business for many years. it's good to have support when you need it. glenn -
To last poster there in Wilmington, NC--Not too far from our place at Atlantic Beach...what is referred to as "Southern OBX>> I am a little sad as life goes on that we never actually moved there when we first visited-44 years ago. Love that beach area-even though I don't move around as quick as I used to- glenn
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LM2 and LZ0 DO NOT have a thermostat in the valve body. LM2 and LZ0 still have the water to oil heat exchanger that the ATF goes through no matter what. So if the thermal bypass in the lines to the aux cooler is closed, ATF goes out the transmission, into the water to oil exchanger, to the thermostat and then back to the transmission. When it gets hot enough to open the TBV in the line, it will then flow to the aux cooler out front to regulate temperatures. The cooling system is going to warm the ATF up as the exchanger is part of that entire Active Thermal Management cooling system. LM2 and LZ0 DO NOT have a thermostat in the valve body. Just the one in the lines. Stock TBV opens at 194F. From TSB 22-NA-182 10 Speed (10L80, 10L90, 10L1000) - 143F (61C) - TBV is within the valve body on all listed applications except those equipped with 3.0 (LM2) (LZ0) Diesel. The (LM2) and (LZ0) Diesel, the TBV is on the frame rail, external to the transmission and opens at 194F (90C). As for your big Duramax, the transmission cooler lines still flow through the side tank on the radiator, so deleting the TBV in the valve body will only lower it so much.
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