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Found 2 results

  1. Story: transmission overheated @ 60k miles. Warranty replaced with new transmission. I’ve had the vehicle (2018 suburban LT 4x4) since new and always sit around 190 degrees give or take and back and fourth around 200 when towing. With the new transmission I keep hitting 210 up to 220 driving around town and not driving hard. I haven’t towed yet but tow often and I am very concerned and afraid to tow. I just finished a thermostat delete to test that out and driving for about 30 min around town and freeway it was over 190 and climbing. It took a while to get there compared to normal but still got hot. Dealership has no clue and the transmission shop has no clue. I need help in figuring out what could be causing the heat. I am so for an oil change and my AC blow nice and cold.
  2. Fellas and Gals! I am having a problem with my cooling fans not coming on my 2006 GMC Sierra, 5.3. I can force them on by running the A/C constantly. But if the A/C isn’t on, the fans won’t come on till the truck reaches almost 230 degrees F, which I’m on the road to cracking a head at the temp. I’ve already replaced the fans, thermostat, engine temp sensor, checked to make sure I’ve got good water flow through my radiator, I’ve replaced all three cooling fan relays and I’ve checked the wiring harness. The fans will come on when I reach in there and manually unplug the harness from the temp sensor while the truck is running and it sometimes will throw a code after that. The only thing I can imagine may be happening is the CPU is not sending the ground signal to command the fans to come on when the engine reaches the appropriate temp (≈ 202, without the A/C being on). Has anyone ever experienced the CPU messing up and not send a ground signal to the system, what am I missing? S.O.S. PLEASE SEND HELP!!
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