I have followed the great instructions from the forum in order to fully flush my cooling system. This is the topic I have based myself onto:
DIY TD42 Cooling System Overhaul
Unfortunately on my GQ the TD42 block drain plug was absolutely unreacheable. Add to that a brake booster and master, as my car is LWD... Only solution seeming possible was to reach from the left side wheel, well where in the majority of recommendations I found online, there is a removable rubber screen that gives you line of sight to the drain plug. Mine didn't have that rubber screen but was all sheet metal instead. I took @PeeBee advise and cut it out. IŽll hand made a rubber screen for it later, to keep dust and debris out of the engine bay.
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With the block drain open, not much water came out to be honest. Most of it came from the radiator. To make sure I was expelling anything old in there, I connected the garden hose to the block-to-heater core fitting and blocked the other end with my thumb to force water to come out of the drain plug. Once I was happy with it, put the plug back with some teflon tape. Including some minor waste while running the engine with the radiator cap open to vent any air bubbles, it took shy of 12 liters of coolant.
I also took the chance to replace the coolant expansion bottle with a new aftermarket one.
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Thought this radiator cap would be cool. I am going to keep a "normal one" in the car just in case.
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