I recently paid to have the coolant in my car flushed while they were replacing a thermostat.

My mechanic said that I should keep an eye on the coolant level and top it up with WATER.

I was always told this was a bad idea and Mercedes explicitly state not to use water.

I’ve called the shop that carried out the work, they say they are super busy and booked out until late next week.

Am I being stupid, or should I push for them to top it up with actual coolant? It’s a two second job, surely!

TL;DR Coolant tank is slightly low, mechanic says to top it up with water instead of coolant.

  • 8008_InspectorB
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    1 year ago

    lmao, everyone on the forums all over the internet freaking out about adding a pint of tap water, yet the dealership is putting gallons of it into every cooling system they service! 🤣🤣

    Is it proper to use distilled or de-ionized water? Of course. Will mineral build-up from tap water eventually clog a radiator? Possibly could, but I’m willing to bet anything that the plastic end-tanks are going to fall apart and it will have to be replaced anyway, long before it’s clogged.