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Here is a DIY for replacing thermostats. This was done on an LLY truck, but I would imagine it is the same or similar across all platforms.
The thermostats are both located near the front center of the engine in between the alternator and AC compressor. Note, I removed my turbo noise suppressor, if you haven't you will need to remove that before starting. If you haven't already, drain a little bit of coolant (maybe 1 gallon). There is a drain valve on the bottom of the radiator on the passenger side. REMOVE THE SURGE TANK CAP FIRST to remove pressure from the system, then replace surge tank cap and remove drain plug. This will allow somewhat of an air-lock so the coolant will drip out instead of spray.
1. Remove the turbo noise suppressor bracket and the wires held to it.
2. Remove the 12mm bolt holding the black coolant pipe to the thermostat housing
3. Remove the four 12mm bolts in the thermostat housing.
4. Now we need to loosen the black coolant pipe so we have some play in it. First remove the 12mm bolt holding the black coolant pipe to the drivers side head.
The thermostats are both located near the front center of the engine in between the alternator and AC compressor. Note, I removed my turbo noise suppressor, if you haven't you will need to remove that before starting. If you haven't already, drain a little bit of coolant (maybe 1 gallon). There is a drain valve on the bottom of the radiator on the passenger side. REMOVE THE SURGE TANK CAP FIRST to remove pressure from the system, then replace surge tank cap and remove drain plug. This will allow somewhat of an air-lock so the coolant will drip out instead of spray.
1. Remove the turbo noise suppressor bracket and the wires held to it.
2. Remove the 12mm bolt holding the black coolant pipe to the thermostat housing
3. Remove the four 12mm bolts in the thermostat housing.
4. Now we need to loosen the black coolant pipe so we have some play in it. First remove the 12mm bolt holding the black coolant pipe to the drivers side head.
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