2010 Mazda CX-9: engine overheating

5 of the 195 complaints about the 2010 Mazda CX-9 describe engine overheating.

owner complaints: 5
of this car's complaints: 3%
recalls: 0

Is there a fix? 29 service bulletins cover this area of the car. See below

Engine overheating by model year

2021
1
2020
2
2019
16
2018
58
2017
27
2016
41
2015
5
2014
3
2013
2
2012
3
2011
2
2010
5
2008
2

What owners say

Filed May 11, 2022 · Engine · WA

The water pump failed and leaked coolant into the engine, causing motor damage which requires motor replacement. There was no evidence of any failure until the vehicle overheated while being driven. This is a known design flaw of the engine design but no recall has been issued.

Filed Jul 16, 2021 · Engine · NC

My vehicle completely shut off while idling in park with no prior warning to anything being wrong. Put coolant in since the container was empty. Replaced thermostat, but vehicle was still overheating. Had it towed to Flow Mazda of Fayetteville and had them run a diagnostic. They determined that coolant was leaking into the oil due to a broken water pump. It was estimated to cost approximately $5,000 to repair with no guarantee that it would fix the problem. They pulled 4 sludge codes. There is currently a lawsuit against Mazda for this specific problem that was filed in 2019.

Filed Feb 2, 2021 · Engine · 108,000 miles · TX

We were sitting in a parking lot waiting on a pizza. We noticed the A/C wasn't cooling, and then noticed the car was starting to overheat. (this was the first time ever). We checked the radiator, it was empty. We purchased coolant and filled up the reservoir. Never saw any leaks. Car started but seemed sluggish like the battery was low. We got our pizza and drove about 6 miles where we parked till we took it to the dealer on monday. Our mechanic called me later to tell me that the water pump had failed and that it had leaked into the oil pan and we would have to have the engine replaced. The repair total for my cx9 is at $9k. We have 108,000 miles on the vehicle. My vehicle is still sitting at the dealer.

Filed Sep 14, 2019 · Engine · 134,000 miles · KS

Me and my husband were on our way home from work. The car suddenly overheated and we lost power on I-35, we were able to get the car to an exit and was nearly hit by another car due to loss of steering and power. We had the car towed to a mazda dealership. There is engine coolant in the oil and we are told it needs a new motor.

Filed May 17, 2019 · Engine · 80,000 miles · CO

The engine overheated while driving on a highway at high speed and failed without warning. After investigation it was found that water pump malfunctioned forcing coolant into the engine. It is now completely inoperable and the car has only around 80,000 miles on it. This is a major safety issue! The car was serviced and oil changed just a few months before this happened. This is a major design flaw on mazda's part, which they seem to know about and never issued a recall to get all the cars fixed. Replacing an engine is not something most families have the budget for or even think about when the car is less than 10 years old. There were no warning signs of water pump failure. Mazda needs to warn cx-9 owners with tsb or recall the water pump. The water pump is not buried inside the engine and cannot be visually inspected. Having a vehicle shut off abruptly when traveling at high speeds is a serious risk for both driver, vehicle occupants and surrounding motorists. I hope the federal safety agency takes this complaint seriously and takes action before a serious or fatal injury occurs.