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  1. M

    Heater issues

    14 Sierra would be a 15 Tahoe. Received the sensor and installed it. Scan data all checks. System worked as designed. 65 here now. Next time the temp drops Ill go on a long ride and see if all is well.
  2. M

    Battery Replacement a Professional Job?!

    Dodge Avenger. SIL has one.
  3. M

    Heater issues

    Ambient scan data shows within 2 degrees of a thermometer and the radio shows correct. I had the headliner dropped to fix an antenna leak. Only other thing up there is the mic. According to the wiring diagram the sunload, ambient light, and inside air wiring all go the the dash sensor.
  4. M

    Heater issues

    No sensor in the headliner. It on the on the dash in combination with the sun load and ambient light sensor. Thermometer shows it to be within scan tool parameters. Seems like an odd place. Everything checks except the evaporator temp sensor. It’s only $30 so I ordered one. I’ll install it and...
  5. M

    Heater issues

    Found the repair tree on Mitchell Pro Demand. I’ll run through it tomorrow. Most of it is checking the sensors with a scan tool against a thermometer. They want everything within 10%. One step is checking high side pressure against scan tool parameters. Guess I’ll have to dig my gauges out too.
  6. M

    Heater issues

  7. M

    Heater issues

    Not a Yukon but a 2014 Sierra. Guessing mostly the same. Has auto HVAC. Start the truck and after warmup heat works fine. After about 15 minutes air flow drops to almost nothing. I threw my scanner on it. No codes. Shut it down and let it sit 10 minutes and it works again after start up. Looking...

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