hsdejong
Mazda CX-5 2023 Exclusive-Line Black Comfort Pack
What is the half-life of a Mazda engine?
Engine does not cool down when parked overnight
- Thread starter eggsalad
- Start date
- :
- 2016.5 CX-5 GT AWD titanium/black 2016 Miata Club ST MT white
hsdejong
Mazda CX-5 2023 Exclusive-Line Black Comfort Pack
Radioactive?Depends, what kind of oil are we talking about?
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- 2016.5 CX-5 GT AWD titanium/black 2016 Miata Club ST MT white
Nope, that's the coolant, he's using the plutonium mix.
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- Canada
*mod hat on*
Alright guys, let's cut back on the joking around and see if we can help diagnose this further.
*mod hat off*
@eggsalad how are your coolant levels? Is the engine oil from the dipstick still hot after the car's been sitting? Any recent work done on the car? Did this happen suddenly, or was it something that gradually got worse over time? Any engine codes or warnings? Does your heat and A/C still work normally?
Alright guys, let's cut back on the joking around and see if we can help diagnose this further.
*mod hat off*
@eggsalad how are your coolant levels? Is the engine oil from the dipstick still hot after the car's been sitting? Any recent work done on the car? Did this happen suddenly, or was it something that gradually got worse over time? Any engine codes or warnings? Does your heat and A/C still work normally?
How is the "diagnosis" going to proceed further if the OP is afraid to even quickly touch the engine for themselves. Feels like a lot of "wheel spinning" has gone on already. Also feels like we're being led. This thread has gotten ridiculous.
Sounds like faulty thermometers or you have a short somewhere creating heat.
Or (or) ambient temp is 130 degrees.
Simple thermodynamics says it's not possible for engine to retain that much heat without external heat source after 12hrs, and especially 36hrs unless ambient temp is the same.
Or (or) ambient temp is 130 degrees.
Simple thermodynamics says it's not possible for engine to retain that much heat without external heat source after 12hrs, and especially 36hrs unless ambient temp is the same.
@sm1ke
Coolant levels are fine and unchanged. Coolant tests fine for blend and acidity. I haven't physically tested the oil temperatures after sitting, but I shall. I bought the vehicle in December and haven't done any work since. No codes, no lights. A/C works fine, I've never tried the heater.
Aaaaand... I think I've discovered the issue... there's just something inherent in the Mazda cooling system that causes it to cool verrrrrrry slowly at high ambient temperatures. This started happening when we got a warm spell and overnight lows were above 90F/33C. That spell has passed; the overnight lows have been in the 70F/21C range for a few days, and the car cools down as expected overnight. This morning (car last driven at 10pm) the coolant temps were just slightly above ambient.
I've lived here for 20 years and owned 8 cars over that time and I've never seen behavior like this before. I can't imagine what is unusual about the Mazda cooling system that would cause this, but for the time being I'm gonna call it "normal" and we'll see what happens when overnight temperatures don't drop below 100F/38C.
Coolant levels are fine and unchanged. Coolant tests fine for blend and acidity. I haven't physically tested the oil temperatures after sitting, but I shall. I bought the vehicle in December and haven't done any work since. No codes, no lights. A/C works fine, I've never tried the heater.
Aaaaand... I think I've discovered the issue... there's just something inherent in the Mazda cooling system that causes it to cool verrrrrrry slowly at high ambient temperatures. This started happening when we got a warm spell and overnight lows were above 90F/33C. That spell has passed; the overnight lows have been in the 70F/21C range for a few days, and the car cools down as expected overnight. This morning (car last driven at 10pm) the coolant temps were just slightly above ambient.
I've lived here for 20 years and owned 8 cars over that time and I've never seen behavior like this before. I can't imagine what is unusual about the Mazda cooling system that would cause this, but for the time being I'm gonna call it "normal" and we'll see what happens when overnight temperatures don't drop below 100F/38C.
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- Canada
They already said that they used a non-contact thermometer to verify the temp. It only feels like "wheel-spinning" because of the extra posts. If you feel like you're being led on, disengage from the conversation.
We do have a zero-tolerance policy towards trolling, so if this is a troll attempt, rest assured that it will be dealt with accordingly. In the mean time, if you have any further insight related to OP's issue to add, please do.
HyFlyer
2019 CX5 sig 2.2 diesel / 2016.5 CX5 touring 2.5na
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- Southwest Ohio
This is the most logical answer so far (that I've seen) and is close to what is happening ...
As @Odrapnew mentioned, it's just not possible for your car to retain that kind of heat for that amount of time without being ran. So, the question is, why is your car running without your awareness?
Does someone have access to your key? If not, then the next most likely explanation is someone is remote starting your car through a [edit ... My Mazda app didn't start till 2019 so move on to key press] or some remote start fob key press combo.(the Internet says "press lock 2 times then press and hold lock on the 3rd time" ) with Perhaps yourself or a spouse/kid/elderly live-in parent etc is unknowingly remote starting your car.
That's what's happening.
Here's some temperatures from my 2.2 diesel this past Saturday with it 99° out after about 5hrs parked (from about 1230 to 1708) ...
After 5 hrs sitting in 90's ambient temps, the fluid drops were ...
coolant 190°F --> 131°F
Engine oil 215°F ---> 129°F
Trans oil 205°F ---> 121°F
Diff oil 130°F ---> 93°F
It is just not thermodynamically possible for your engine to retain the amount of heat that you're describing without running.
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- 2020 CX-5 GT AWD
What app is this and does it work with iPhone?
HyFlyer
2019 CX5 sig 2.2 diesel / 2016.5 CX5 touring 2.5na
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- Southwest Ohio
I've never used it but the Internet says ...
https://mymazda.com/MyMazda/mazdaConnectedServices.action
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- 2020 CX-5 GT AWD
I am confused. You posted a screenshot from an android phone with all sorts of engine/car parameters. I assumed that the screenshot is from your phone. That's what I am talking about.
HyFlyer
2019 CX5 sig 2.2 diesel / 2016.5 CX5 touring 2.5na
- :
- Southwest Ohio
Oh, gotcha. Haha, I'm the one that was confused ... I thought you were asking about what app remote starts your car.
The car data app I use on Android is called FORscan lite in combination with a Bluetooth dongle plugged into the OBDii port. (You can likely find better pricing for the dongle at your favorite online discounter) .
FORscan website does show that it's available for iOS ($6.99)
