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Originally Posted by shinobi
Thanks for the ideas pwpanas. I've basically concluded that there is something corroding in the cooling system, just not sure what. I would prefer to replace it before it fails leaving me on the side of the road in a green puddle. Options are; radiator, hoses, pipes, water pump, block, head, heater core, thermostat, heater switch.
I think you might be on the right track with the coolant pipes around the engine. There seems to be several, one that runs the length of the engine under the exhaust manifold.
The car is due for a timing belt in a few weeks. While I've got it stripped I'll be checking all the pipes and water pump etc, hopefully that will solve the problem.
Thanks again!
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If your coolant wasn't changed for a loooong time, it's not just one thing that's corroding in the cooling system - it's EVERYTHING! (sorry to break the bad news to you). Of course there may be one or two components that are slightly more corroded than the rest, and these parts might be so far gone that they may fail eventually regardless of your Supra's improved maintenance, but then again they may not fail too. Regardless, simply replacing those one or two parts now will
not fix the overall problem. You'll need to follow the steps outlined in my previous post. Coolant (and water wetter) have anti-corrosives, and will prevent further corrosion after a very thorough flush. After that, be sure to change your coolant regularly (i.e. follow a proper maintenance schedule). That's it.