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Install New Thermostats and Secure Housing

5:47
11:29
76.3K views

At 5:47 in

LBZ Duramax Thermostat Replacement (Quickest Way)

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What happens here

Insert the new thermostats into the housing, ensuring their O-rings are seated correctly and any vent holes are positioned as the old ones were (typically towards the back). The presenter notes that he simply put them back the way they came out, without fully understanding the 'why' behind the vent hole orientation, trusting the manufacturer's design. Once seated, reattach the thermostat housing and secure the front and back bolts. The other two bolts are for the hose bracket and will be attached later.

Goal: Replace the thermostats and secure them in the housing

Tools and materials

  • 13mm Socket/Wrench — Tightening the thermostat housing bolts
  • New Thermostats — Replacing the old, faulty units
  • Thermostat Housing GMC — Holds the thermostats in place

What they say

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maybe not though I can see I need to hands update depending so it turns out you can get those in there without pulling the AC or any of that stuff I just did it you lift it up enough and it kind of gets pushed into this thing here and you can finagle both of those in and out without it being any higher you just kind of need to use two hands and guide it out there this little spot here this is what I took out this one was kind of it kind of came up half and half when I pulled the housing off but see it's got these vent holes in the back I read that you want to have those in the back I don't know exactly why but they say that you should put him there or she gets it bends of a bad head gasket or something I don't know I didn't look too much into it I just put him in the back because that's how this one came out put it exactly the same way that was before and the front one seems to be symmetrical everywhere so I just put it in that was pretty simple honestly now I'm gonna get this catback on here and bolt it all down and then pull this breather off and fill the cooling back up until it comes out of there to get all the air out because that can cause problems also if you don't bleed it correctly so I got the two front and

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