Noticed my Mazda 3 2020 has been running cold lately. Is this an issue? Outside temps will be 40° F - 50° F.
Picture shown was taken on highway after driving for 1.3 hours.
Maybe it’s one of those temp gauges that actually shows the temp.
Old Mercedes are like this, the temp gauge actually moves during driving. Oil pressure gauge too. Freaks people out, so now they all just sit in the middle of the range unless the car just started.
My gauge seems to sit just above where yours sits after any amount of driving, might have to get mine checked as well…
Since the temp gauge doesn’t have numbers on them, which line is the normal/ideal operating temperature?
Coolant control valve If you have powertrain warranty, it’s covered
My girlfriend’s cx5 had the same issue, the dealer replaced the thermostat for free under warranty. There is a tsb out for it.
Same with mine as well — CX30.
Mazda really eating these warranties aren’t they
Mine just started to leak around the spark plug at 22k.
Sounds like a thermstate issue
Ice cold zoom zoom
This is sort of a known issue for all non-turbo 2019-2022 model years for Mazda3 (talking here about US market).
Mazda doesn’t use a mechanical thermostat but an electronic one called Coolant Control Valve (CCV) and in the issued TSB (that got several revisions) they mentioned the problem is within the CCV with the fail-safe thermostat which seems to be opening too soon (some folks opened the CCV and manually adjusted that fail-safe thermostat and seems that the problem got fixed for them).
Personally I had this CCV replaced twice under warranty and issue wasn’t fixed and ended up being unsure on the root cause with dealers ended up being out of ideas and with open case with Mazda.
What is known now is that turbo engines never used CCV and from MY2023 they moved back to a classic thermostat and seems to have abandoned the CCV idea completely.
- 2019-2022 model has the part (15-16Z)
- 2023 model has 15-17Z which is listed as “Outlet, Water” and there is also a part called “Cover, Thermostat”
This is almost always a stuck thermostat or similar. These systems are designed to “fail open”, so that you get too much cooling (mostly harmless) instead of no cooling (engine go bye-bye).
Ooohhh that’s the disclaimer
I wonder if that’s a deal with most or all their cars with the 2.5L I4 because I noticed something like that on the CX30 I rented but a smidge warmer maybe?
My Mazda was running cold when the thermostat was slowly failing. You can probably expect a check engine light pretty soon, but i wouldn’t wait on it, especially if you live in an extremely cold area. A cold engine is very bad for the duration of its life because of accelerated wear and whatnot.
Brought it to the shop and they said they were literally “unable to look at it without the engine light”. I straight up asked for them to take a look at it directly and I would pay for all labor out of pocket but they said they couldn’t take my money without an engine light per Mazda’s Mx rules.
Coolant control valve. Must have replaced hundreds by now, literally