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  1. R

    2012 gmc lml overheating

    The truck has 155k miles
  2. R

    2012 gmc lml overheating

    Fan comes on and coolant stack is clean
  3. R

    2012 gmc lml overheating

    Well that's as far as I let it go it wld have gone past that if I'd have not pulled over given at the rate it was climbing and only does that as certain times kinda as if my thermostats were sticking but idk about the suction part at the refill cap
  4. R

    2012 gmc lml overheating

    So my 2012 gmc lml has recently started to overheat to about 220 and sometimes a bit more and only happens every now and then and it's happened maybe 3 times to which I immediately switched it off and when I went to check it out I released the coolant refill cap and had suction I believe, im...