Engine overheats or leaks coolant

What got replaced

Owners who name the part that was replaced mention the head gasket (11 reports), the coolant hose or reservoir (6 reports), the radiator (5 reports) and the water pump (4 reports).

Recalls and investigations

No recall on the engine covers the 2016 model year as of Sep 19, 2026.

What owners paid

18 of the 52 reports quote a price. Each dot is one quote. The middle half runs $5,000 to $7,700.

When it happens

The middle half of failures fell between 64,575 and 120,000 miles, from the 20 reports that gave a mileage.

What owners wrote

“Head gasket leaking and caused major engine issue at 89,000 miles. Mazda has known of this issue, but refuses to recall it.”

Filed Nov 21, 2024 · 89,000 miles

“Head gasket blew in a 2016 Mazda CX9 while driving causing us to as safely as possible quickly get off the road from the middle lane of an interstate. This is from a known coolant leak in the cylinder head from service bulletin 01-013/21.”

Filed Feb 17, 2023

“Car overheated. check front engine and could not see any visible leaks. check all around the engine and found coolant leaking from the back of the engine. confirm by dealer that is leaking at the cylinder head.”

Filed Dec 30, 2022

“I am being told by the dealership service center that there is a coolant leak from the engine. A previous coolant look due to a hose was repaired but this is a separate issue related to the TSB for coolant leak at the cylinder head Bulletin 01-007/22”

Filed Dec 20, 2022

Other problems on this car

• Check engine light or misfire 41 reports