Does the 4.2L have a drain plug for the coolant in the block? According to the manual it does, it's mentioned after step 8 of the draining procedure:
I can't see any plug that might be for coolant and Google gives me nothing about it. I'd like to completely drain the coolant for a flush--just using the lower radiator hose drains about 6.5 quarts and the spec is for 9.7 quarts so there's still about 3 quarts remaining.
Cooling System Draining and Filling (Static Fill) — 2008 Chevrolet TrailBlazer 2WD L6-4.2L Service Manual ~ LEMON Manuals
Repair manual for the 2008 Chevrolet TrailBlazer 2WD L6-4.2L, including electrical diagrams, bolt torques, and labor times.
lemon-manuals.la
I can't see any plug that might be for coolant and Google gives me nothing about it. I'd like to completely drain the coolant for a flush--just using the lower radiator hose drains about 6.5 quarts and the spec is for 9.7 quarts so there's still about 3 quarts remaining.