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Drain Coolant and Remove Old Thermostats

4:36
11:29
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At 4:36 in

LBZ Duramax Thermostat Replacement (Quickest Way)

What happens here

After unbolting the necessary brackets, gently pull up the thermostat housing. As you lift it, coolant will begin to spill. Position a drip tray underneath the engine to catch the draining coolant, preventing spills on the ground. Once the housing is lifted enough, carefully maneuver and remove the old thermostats from their seats. The presenter demonstrates that this can be done without fully removing the AC compressor, just requiring precise handling.

Goal: Extract the old thermostats and collect draining coolant

Tools and materials

  • Drip Tray — Collecting draining coolant
  • Hands N/A — Manipulating the thermostat housing and removing thermostats
  • Old Thermostats — The parts being replaced
  • Thermostat Housing GMC — The housing for the thermostats; needs to be lifted
  • Coolant — The engine's cooling fluid; some will be drained