Hi all
My 1200GX was re cored many years ago. I need to replace coolant as it has been using the current coolant for many years now. Coolant is still green and I can see the fin holes inside the radiator through the green coolant. My question. Due to the age of the car, must I maybe use a coolant flush product to clean out the pores in the block and the intake manifold where all the radiator water circulates?
I am between 2 worlds at this stage. One side I just want to flush with a hosepipe and normal tap water and replace with distilled water and coolant mix and on the other side I want to use a flush to maybe get rid of all the scaling that might be present inside the passages due to age of the engine. I am however concerned about stuff getting loose and clogging a water port with my luck.
What are your thoughts?

quality coolant can last many years (my Forester has 16 year old coolant and is very clean inside)

if it looks clear now, i would use tap water to flush out the system and the block, then fill with distilled water/coolant mixture

You might see some rust flakes come out of the engine block drain plug hole, that is common with iron blocks

see Coolant Replacement

Wow. thanks for the link. never knew about this bolt. I doubt it was ever removed in the car's lifetime.
I hope I will get it loose.

Quote:
Chances are it is because it is possibly a aluminum block.