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- Canada
Thanks for clarifying and confirming!
2019-2020 CX-5 GT Reserve and Signature 2.5T Engine Coolant Leaking TSB
- Thread starter sm1ke
- Start date
Thanks for clarifying and confirming!
I received the letter today. Kinda peed me off since I purchased an extended warranty a few months back just for this problem. Happy for the owners that have or will experience this problem.
Hopefully it won't be many.
Oh well, if my radio or folding mirrors break I'm covered.
Hopefully it won't be many.
Oh well, if my radio or folding mirrors break I'm covered.
Does anyone know whether this issue would manifest itself as a burning rubber smell and smoke coming from the rear passenger side of the engine? We have noticed a burning smell when the car is driven more than 5-10 minutes at 35 MPH or more. When we park and open the hood, we can see smoke coming up from a heat shield. Attaching aa pic for reference for reference. We called Mazda but can't get in for service for 2 weeks. Any insight appreciated.** Moderator Update**
Please review the Mazda Dealer communication below. Mazda has issued a Customer Service Program (CSP11) to extend the limited powertrain warranty to 10 years/120k mi for any owners experiencing the coolant leak. Further, any owners who have paid out of pocket for these repairs may be eligible to receive reimbursement for costs incurred.
This CSP11 is applicable to the following models (if equipped with the 2.5T):
- 2016-2020 CX-9
- 2019-2020 CX-5
- 2018-2020 Mazda6
**End of Update**
CX-9 2.5T Engine Coolant Leaking TSB
Moderator edit: This is a copy of a post originally made in another thread. This thread was created for easier reference. Mazda recently put out this TSB for coolant leak because of cracks in the cylinder head. As reported by many here it seems to affect the 2.5T 2016-2020 CX-9 as well as...mazdas247.com
Applicable to 2019-2020 Mazda CX-5 GT Reserve and Signature trims (refer to VIN range).
Thanks. I have been checking the oil and haven't noticed it being low. Also put it up on ramps yesterday and had it running for 15 minutes. Removed the oil drain cover, wiped everything clean, and waited. No leaks or drips. Coolant was low, though. The car has never overheated, and we have been keeping an eye on the temp gauge. But very low coolant has to mean something, I think. Could the coolant be leaking in small quantities onto the manifold or some other hot surface, causing the smoke issue?
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- Mazda CX-9 Signature
If it's leaking coolant, you'll likely see white residue after it's evaporated. You said theres smoke. Put the car in park, pop the hood again, and have someone rev the engine. See if that would generate more smoke.
No, not a turbo. I hadn't thought about the water pump. Good insight. On our older 2009 CX-9, I thought the water pump was integrated into the engine. Is it different on the newer CX-5s?
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- CX-5 Sport 16.5 6M
yes, it can be replaced and there are lots of links on this forum, plus in the resources the manuals on p2.
Okay, some new evidence. I took the car for a spin. About 3 miles at 35 MPH got the engine temp up to just under 210 F. When I parked and popped the hood, there was smoke coming up from the same spot, rolling up from around the heat shield. Left the ending running. A few minutes later, the smoke dissipated. I checked the temperature gauge again and it was still reading the same temp of just under 210 F.
New working theory is that wherever this leak is, the wind from the road is throwing coolant onto the manifold, which causes the smoke and stinky smell. Stop moving, the issue goes away. Does that lend itself to the water pump theory or the cylinder head theory?
Next step for me would be to remove the plastic under the front end and see if I can detect anything while the car is running. But if anybody has any thoughts here, I'm open.
New working theory is that wherever this leak is, the wind from the road is throwing coolant onto the manifold, which causes the smoke and stinky smell. Stop moving, the issue goes away. Does that lend itself to the water pump theory or the cylinder head theory?
Next step for me would be to remove the plastic under the front end and see if I can detect anything while the car is running. But if anybody has any thoughts here, I'm open.
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- Canada
The coolant level on the reservoir tank is not an accurate representation when the engine is running or if it is still cooling down from being driven. You can get a more accurate, consistent reading if you check the coolant when the engine is cold. Whenever I check coolant on my CX-9, I do it first thing in the morning, before I start the car. If it's near the Low mark, I'll top it up.
The smell of coolant being burned is very distinct. It has a very sweet smell to it, like maple syrup. The smell you describe sounds more like burning oil possibly.
Lastly, because your car doesn't have the 2.5 turbo engine, the majority of information provided in this thread will not be applicable to you. There is a separate thread for cylinder head cracking issues on 2.5L engines with cylinder deactivation. Click on the link below for more accurate information that relates to the possible issue you may be having:
Might be a small leak in the valve cover gasket
Thanks for your reply. This is super helpful. I checked the coolant level after waiting 3 hours, and again this morning. It’s lower, and whatever was going to be in the reservoir was there by then.
hello guys, I've tried to find the answer here and on the web, with no real success.
I have 2021 (made in Feb or March, can't remember) CX5 TURBO.
I realize that the issue of leaking coolant and cracked head officially applies to 2019-2020 CX5 turbo. Does it mean that 2021 is not affected? Did they change anything in the cylinder head some time late 2020 / early 2021 and therefore my 2021 is not listed on that TSB?
Did you see any evidence that 2021 are actually affected?
Also, I am in Canada, if that's info is needed.
Thank you very much
I have 2021 (made in Feb or March, can't remember) CX5 TURBO.
I realize that the issue of leaking coolant and cracked head officially applies to 2019-2020 CX5 turbo. Does it mean that 2021 is not affected? Did they change anything in the cylinder head some time late 2020 / early 2021 and therefore my 2021 is not listed on that TSB?
Did you see any evidence that 2021 are actually affected?
Also, I am in Canada, if that's info is needed.
Thank you very much
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- Canada
The first post in this thread explains that the 2021 models are not affected. There is also a link at the end of the first post to one of the original 2.5T cylinder head cracking threads that points to a post with a copy of the related TSB for this issue. In the TSB, it states that the exhaust manifold gasket and the cylinder head were redesigned to resolve this issue in 2021 models.
