Hello,

Just bought a 2021 (21) cx5 sport 2L. UK

Love the car, but noticed on the drive home from the dealer that the coolant temperature didn't go more than 50°C. And the heater wasn't blowing out full heat.no CEL yet though.

Read some posts online that it could be a thermostat stuck open.

I reached out to the dealer and said that 50°C is normal operating temperature and it's just cold. Which I don't believe as I drove for 60min at motorway speeds with the heater on and it didn't increase.

I also mentioned about the TSB article regarding this and he mentioned it's for the NA market as they have different engines ?!?

​​​​​​Also I Stop doesn't seem to be kicking in?

Any help would be great

 

Definitely sounds like a bad thermostat.

 

Welcome to the forum.


who scanned your ECU?

Running that kool for that period you mention there will be information in the ECU. There is more than one area looking for DTCs.

 

Ah it's frustrating.

I have one of those Bluetooth odb no live error codes.

I ran temp live data over a morning drive (see below)

I went to Mazda tech this morning, he said it's normal in the cold. Showed him the graph and he just didn't seem to be interested.

Mentioned that I stop not working he said it's cold and perhaps low charge battery.

Showed him the TSB from NA, again he did a search and nothing EUrelated

 

So couple of things.
For all reading this.
Using your devices to and really "KOOL" DATA logs does not help. It like telling a person to read a book and giving them ONE PAGE.
Giving a TSB to a service rep at a dealership does not help build a report between you and the service dept. When your VIN is entered the program also alerts the service advisor or mechanic of any SAFETY Recalls and TSBs related to your Mazda Think of these examples of the none helpful items the same way if you went to the hospital with your internet thought to be the health concern and used an ap to hand the attending a EKG of you your heart> DOSENT HELP>
When I get a customer with all this kind of info I pull out a waiver and say here you go sign thin this and you have use of the bay and basic tools to work on your vehcle because it appears you know what's wrong with it.

Ok back to the OP I clearly said that in the ECU there are information that the needs to be accessed (this is what an Automotive Technician will do first) pertaining to your deception of the concern. There will be information if properly scanned and should be .

So Good luck with your Mazda concerns !

 

Yeh literally they did that, lol.. just looked the other way and didn't care, and well it makes sense they can't trust that data.

The only data they trust is from their own diagnostics machine which is understandable.

What happened to the days of relying on skill and experience to diagnose the issue, instrad of blaming the weather and that different brands have different OTs.

Anyway I raised the issue with Mazda UK HQ, and they responded to say that the master technician agrees that it's not normal. They have asked me to go ahead and book a diagnostics and provide them a date so that the master tech can be on call when it happens

Hope they can pull some data from that

​

 

I appreciate that you at least read and did not take great offence to my response. I am 30+ years as an ASE and have held the Master Automotive Diagnostic Certification (current) in as many years. It a PIA to smile and give good customer service when everybody "thinks" that they can to an end around what takes an education and service experience minimum 2 years before you can even test to become a basic certified factory automotive mechanic and just as hard to get ASE certification. Not all dealership employee this type of certified automotive mechanic or technician and are not required too either. Mazda like many dealerships is still an independently owned business and have a PL (profit and Loss) statement that must be met with their investors which include and often not mention anywhere regarding cost as in that sticker price of a vehcle. The BS media often suggest and shows ways to see actual sticker prices to the dealerships disregarding a main item called flooring cost and charges which gets higher per vehicle the longer it sits on the sales lot and not sold. Another item not understood, end of the year sales of remaining same year models. Any I could continue this rant about lack of information or misguided information about dealerships.... but back on topic...

I am glad to read that you will have a "Master Technician" diagnosing your Mazda. I am very confident that he/she will find the issue(s) and that it will be covered under the WARRATY. Please post up what they find and the resolve.
am sorry I could not "GUESS" your issues and that is only because of needed ECU information. I hope you understand seldom ever "guess" problems for members.

Just for a laugh that you will understand here is a DATA logged operating stream from a customer I do EFI/ECU Performance Calibration for. This is a sample of a target RPM range. I can also pull similar DATA runs on an OEM ECU that helps troubleshoot engine running perimeters, but this would be considered extreme and not really used at any platform's dealerships. Most would just flash the ECU with the most current program and go from there.

 

I appreciate your responses and next steps. And keep doing it, it's the only way we can learn from eachother

Im annoyed as we purchased a car already from a car supermarket and rejected it a few weeks back due to dpf sensor issues (not a Mazda)

My thoughts that going to a main approved dealer that there wouldn't be any issues and that if there were I wouldn't be fed any bull*** so that they don't have to cover costs

But here I am with an issue and it's the sales director and service tech aren't willing to help.

At most I would like them to listen to the customer concern, relate it to the TSB (irrelevant to country) and then have a tada moment to look into it further. Be proactive before a larger issue happens rather when reactive when an EML comes on.

Shouldn't have to escalate the case to HQ, I've just had the car for 3 days !

Rant over

And the chart. That so could have been made in MS Paint :-p

 

LOL
That particular one is 8 years old and the program a rare in the ECU access programs available that allows for FULL Global access to the complete ECU and ability to alter any operational cell.
I use Versta Tune on my Mazda and it has many limits that they did not break the codes for global access, but it is still one of the better ones offered for some model Mazda's
For other platforms I use Diablosport and also Dimsport both which the PID Live Data still uses the old-style Data stream like the one I posted.
With most all these programs there is a user preference that allows for a the colorful 3d graphics and other ways to view ECU operations that I also could use but find good old fashion analog Data steaming to work better for me. It the same when I rent a planes many have digital screens for operating information but I tend to rent a plane that has both analog gauges and digital referencing. I am to old-school gauge reading for how my brain reads them and thinks about what they are showing, if that makes sense?

 

A man after my own heart. I will admit though that, when I was still flying, digital gauges on general aviation aircraft was almost unheard of.