80,000How many miles do you have on your CX-9?
Extremely small sample size, as sm1ke points out, but I wonder if this is a sign of things to come when people start to get around the 4yr/60K milestone.
80,000How many miles do you have on your CX-9?
Extremely small sample size, as sm1ke points out, but I wonder if this is a sign of things to come when people start to get around the 4yr/60K milestone.
Ya sorry, I’m not that savvy with cars. It’s basically a head gasket issue. Note sure why it started leaking all of a sudden though.I wonder if all 3 of these leaks are really the same issue or not. We really need some more information!
The first one sounded like a block porosity issue or a cracked block, in which case I could understand replacing the whole engine.
The second one is still a mystery. Did the dealer say why they need to replace the entire engine?
The third sounds like a head bolt or head gasket, although the explanation is not clear. Lots of engines are made of aluminum these days and case and head bolts don't normally back out. This happens so rarely that when it does, it tends to be news (Ford 4.6 V8's had issues with spark plugs blowing out, for instance). Even if it did happen, I would think you could replace and/or retorque the bolts without junking the entire motor.
That’s a good point.What kind of warranty is your trusted shop offering you on their repair ? If you already are covering the costs under 3rd party warranty i would get it done at a dealer, especially for such low mileage and age. You will likely get better warranty for the repair, will be able to better diagnose the source and may even drop in a brand new engine instead of a repaired one.
I posted this on another thread but seems to be similar:
I have a 2016 Mazda CX-9 with 115,000 miles. Just the other day I felt the car starting to misfire and jerking and then noticed the temperature needle moving up to about 250 degrees but did not hit the red area or give me a check engine light. I let the engine cool down and checked my radiator reservoir and it was empty. I bought the Asian Coolant for Mazda and filled the reservoir. I drove it a little and it started going to about 200 to 210. So I stopped. I could not see any coolant leaks from the bottom of the car. I ordered a thermostat and replaced it. It ran fine for a week and then started doing it again.
I took it to the dealer they said that there was coolant on the backside of the engine probably when I replaced the thermostat. They cleaned it off and told me to come back next week. I brought it back the next day because it was getting hot again. They kept the car and called me back the next day and said they notice a leak on the back of the engine and that they need to take the head off and send it to get inspected. They called me yesterday and said the head was good but they did see coolant in #2 and #3 cylinders and suggested I replace the entire engine! Cost is $7500. So they don't know where the leak is coming from and their solution is to replace the engine and that should fix it. I would certainly hope so. Have anyone encountered a similar problem?
I'll throw in the update on my 2016 Mazda CX-9 Signature which had 64000 (at 3.5 years), so just over the 5yr/60,000 mile warranty. I wrote on this thread back in March 2020 that I got a coolant leak, took it to the dealer and they said the engine needed to be replaced, at my cost. I couldn't believe it - never heard of replacing an engine with such low mileage, plus I had bought the Signature which was the top trim level when it first came out, and I had purchased two other Mazda 3's including a 2018 that I had recently purchased from that same dealer.
Mazda wouldn't approve the new engine, instead offering to cover just the minimum to repair it. It took weeks of back and forth with the dealer - note this was during covid so I understand some of delays - they tried to fix it and they had the head machined; didn't work and the engine ended up being further damaged. My understanding is the dealer blamed the machine shop and forced them to pay for the new engine.
After around 2 months they gave me back the car and it was a disaster - airbag lights, no cruise control, multiple warning messages - they told me it would sort itself out. I couldn't accept the car with airbag lights on, so I returned it and it took them another month or so to figure out the issues - they told me reinstalling the software fixed it.
So 93 days later we finally got the CX-9 back with a new engine. The whole situation has left me with a sour taste on Mazda, which is disappointing. I do enjoy driving Mazdas, and I've gone out of my way to do some videos on youtube (not monetized) liketo help others with some of the basic maintenance which have received some positive comments.
Anyways, I'm not looking for nasty responses please - I'm just posting this to share what happened in my situation in case it can be of help to others.
New here
I have a 2017 Mazda CX-9 Touring bought it at 19k miles currently at 53.8k miles. Last night noticed coolant leak underneath it near rear of engine. Nothing visible on engine or under hood but clearly visible under car. Praying cracked engine block is not the case but I don't feel great about it after reading this thread. Wish me luck
So do you see coolant stain dripped to the bottom of the engine or on the floor?New here
I have a 2017 Mazda CX-9 Touring bought it at 19k miles currently at 53.8k miles. Last night noticed coolant leak underneath it near rear of engine. Nothing visible on engine or under hood but clearly visible under car. Praying cracked engine block is not the case but I don't feel great about it after reading this thread. Wish me luck
May I ask what year your CX-9 is? I've heard some say this is an issue with 2016 models, but could be that they're just first to experience this.I believe I may have the same issue. I have a coolant leak as well and a shop told me that because the engine block is made of aluminum, the bolts that hold it together may have loosened causing the top part of the engine to pull away and causing the leak. They are estimating $2500-3000 for the repair because they have to pull apart the told of the engine block and possibly re-thread the bolts. I read above that the dealership is just doing an engine swap to address possibly this same issue. How much does an engine swap usually cost? If it's not much more than I rather just swap the engine and start fresh.
May I ask what year your CX-9 is? I've heard some say this is an issue with 2016 models, but could be that they're just first to experience this.
Is that "top" part the head? Is it just a case of the head bolts coming loose? I suppose that could also cause damage to both the block and head, but if the shop says they can repair it for around $3000, that sounds like what a head gasket replacement might go for. Do they need to machine the head?
I wonder if Mazda has changed the head bolt torque spec over the hears. That might be something we should try and figure out.