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Q: coolant leaking

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Replaced whole system still leaking why?

My car has 145000 miles.
My car has an automatic transmission.

Hi there:

If you recently had your entire cooling system replaced and it’s leaking coolant, it’s either one or two reasons. First and most logical, a hose was not properly attached or is loose. Second and most likely however is that your coolant system may have been filled with either too much coolant, or a higher concentration of coolant to distilled water. Most of the time, coolant sold in stores is a pre-mix 50/50 ratio of coolant to distilled water. However, there are some that are sold as a concentrate (100% coolant). As coolant gets hot, it expands; which can push out of the radiator and coolant tubes into the overflow reservoir and spill from there.

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