dj mats

trying to see if it’s anything else before that. that’s the last thing i’m gonna check. hoping it’s something else

i have a new thermostat and new coolant temp sensor. still over heating but not everytime i drive it. over heating stops once i let out all of the pressure out of the coolant reservoir and it comes back up smelling burnt and a burnt color. what do i need to fix!?

i have a 2007.5 gmc sierra 1500 sle 2wd crew cab and the 4.8l v8 went out in it and i was wondering if a 5.3l would fit just plug and play or do i need to do any major changes to it?