me too use the mild citric acid meant for drain clog-cleaner...and meant to use with warm water.....managed to remove a few big chunk of rust (it came out clumping like clay).......
flushed for good 4-5times with warm engine...
but i'm still unsure what was the cause of my missing waterpump blade....1-if the previous workshop didnt replace my waterpump during timingbelt change (and charged for it) or that cheap mixed various brand of coolant or imitation toyota LLC used previously (that clogged my radiator and overheated my car again) or that citric acid flush....
but no worries...replaced new waterpump during recent timingbelt change (3-4years old timingbelt if i remember correctly)
flushed for good 4-5times with warm engine...
but i'm still unsure what was the cause of my missing waterpump blade....1-if the previous workshop didnt replace my waterpump during timingbelt change (and charged for it) or that cheap mixed various brand of coolant or imitation toyota LLC used previously (that clogged my radiator and overheated my car again) or that citric acid flush....
but no worries...replaced new waterpump during recent timingbelt change (3-4years old timingbelt if i remember correctly)
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