You might also notice your coolant level dropping, your engine running hotter than usual, and your car’s performance taking a nosedive. Water leaking from your muffler is not necessarily a cause for alarm. Here are a few reasons why your muffler may be leaking water
Furnace Exhaust Pipe Leaking Water: 5 Causes & Fixes | Quiet Home Life
Water condensation resulting from engine combustion every time your car comes on, combustion occurs in the engine, producing a mixture of water and carbon dioxide
The exhaust gasses depart the combustion.
The exhaust system has only one exit, so when water is leaking from the muffler but not from the tailpipe, the main cause would be rust It’s also possible that the exterior of the muffler is condensing water as it heats up Is it normal for water to leak from your muffler
