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Tesla Thermal Management System - explanation
- Thread starter arnis
- Start date
I believe the S/X motors are just harder designs to cool and the permanent magnet on the 3 easier.
Also I believe all those little cells are a lot harder to cool than you think. It is not like an ICE where everything is metal and can be operated in a couple hundred degree temp range.
I used the free Scan My Tesla DEMO app with a cheap bluetooth ELM327 OBD2 dongle (from China for like $4) and read all the thermal management system values (and other stuff like battery module voltage & temp).
Car was parked (for last couple of days) in 2 degrees C garage (northwest winter) but battery was at 20C with me just sitting in the car for like 5-10min capturing the diag app screens. Cabin temp set about 70F. Factory 40A charger was plugged in but charge was at the set limit. Not sure if it was trickling in here and there.
Whats is interesting is coolant heater is at 0% and battery is at 20C compared to ambient of 2C. Only "heat" I can see is the stator at 33C. Maybe the onboard AC/DC convertor can generate some heat too? if trickling power in. Interesting mystery haha. Here is my full data set to cross reference with the pics in post #1.
Vendor - Scan My Tesla, a CANBUS reader for Android
Car was parked (for last couple of days) in 2 degrees C garage (northwest winter) but battery was at 20C with me just sitting in the car for like 5-10min capturing the diag app screens. Cabin temp set about 70F. Factory 40A charger was plugged in but charge was at the set limit. Not sure if it was trickling in here and there.
Whats is interesting is coolant heater is at 0% and battery is at 20C compared to ambient of 2C. Only "heat" I can see is the stator at 33C. Maybe the onboard AC/DC convertor can generate some heat too? if trickling power in. Interesting mystery haha. Here is my full data set to cross reference with the pics in post #1.
Vendor - Scan My Tesla, a CANBUS reader for Android
You should probably know that the DEMO app is just a UI demo, it plays back a log from my car driving to work a cool spring morning
Left and right heaters are for cabin air. No battery heating on me that morning, since the battery already was above 8c or what the heating limit is usually at.
You should probably know that the DEMO app is just a UI demo, it plays back a log from my car driving to work a cool spring morning
haha, I was fooled
Thanks for the explanation I just came across this post. Great work! Very Helpful! How did you get access to diagnostic mode?
Lasttoy
Active Member
If u take your frunk out, u can see the coolant cooler, it is a very small metal box below the power steering. It has 2 coolant hoses, and 2 refrigerant tubes. A valve opens allowing 134k to cool the coolant. There r 4 diverter valves. It's insane to follow.
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Lasttoy
Active Member
My battery heating system is not working, I used a digital thermometer to read coolant temperatures. When it's cold the coolant is same temp. My gearbox coolant temp was 120 yesterday. They say the reason I cannt super charge is my coolant is never 70. It was 85 yesterday, and I only charged at a 30kw rate. So u figure, I cant?
Tesla says pump 2 is bad, yet pump 1 runs all the time. Which I see no correlation to the heater never turning on?
Tesla says pump 2 is bad, yet pump 1 runs all the time. Which I see no correlation to the heater never turning on?
Maybe the system won't turn the heater on when it detects the pump is bad. And maybe it runs the other pump overtime to make up for it.
Why do you think you know what the problem is better than them?
Lasttoy
Active Member
I was parked a week ago. A guy walked over, he heard me on the cell with help desk, he typed my Vin in his cell, he says "u have coolant error codes, your coolant is not up to operating temp." He got in his car and drove off before I could talk. Evidently he was a technician that had access to any car.
I have have had RE Gen and high speed warnings for months. I called so many times. "Nothing is wrong". I have log of every charge for 4 yrs . Pictures.
I got on here, there are a lot of posts. If battery temp is too low, car wont super charge or RE Gen. The guys up north know this. Yesterday it was 80 here, my car still go higher than 30kw. So, I will change pump 2. See what happens.
I think they have throttled all the antique cars to get us out of warranty. My opinion. Last November, before v10, I was always close to 100kw, or above. Teslafi has it all stored also.
Dont get me wrong, I love the car. Just Tesla's Karma has gone down lately. I ordered a truck.
I have have had RE Gen and high speed warnings for months. I called so many times. "Nothing is wrong". I have log of every charge for 4 yrs . Pictures.
I got on here, there are a lot of posts. If battery temp is too low, car wont super charge or RE Gen. The guys up north know this. Yesterday it was 80 here, my car still go higher than 30kw. So, I will change pump 2. See what happens.
I think they have throttled all the antique cars to get us out of warranty. My opinion. Last November, before v10, I was always close to 100kw, or above. Teslafi has it all stored also.
Dont get me wrong, I love the car. Just Tesla's Karma has gone down lately. I ordered a truck.
You should probably know that the DEMO app is just a UI demo, it plays back a log from my car driving to work a cool spring morning
Left and right heaters are for cabin air. No battery heating on me that morning, since the battery already was above 8c or what the heating limit is usually at.
Quick question, I have smt and my heater R is bouncing from 55 F to 415 F which is causing my PTC to shutoff and not warm the cabin. Where is the physical location of Heater R probe. Is it in the heater box or ducting or is it within the PTC itself? Thank you
We are expecting some traffic here, as first post was mentioned by Sandy Munro (Munro Live):
A lot has changed during those years, Heat Pump is awesome, but I'm not happy that there is
no plan B for heat generation on those new models. HP's usually struggle at -20*C or below.
Also problems with frost near freezing, -1*C. I'm not sure how to defrost at highway speeds.
Louvres must be really airtight
PS: If you are not subscribed to MunroLive, transition to sustainable transportation is postponed for 1 minute
A lot has changed during those years, Heat Pump is awesome, but I'm not happy that there is
no plan B for heat generation on those new models. HP's usually struggle at -20*C or below.
Also problems with frost near freezing, -1*C. I'm not sure how to defrost at highway speeds.
Louvres must be really airtight
PS: If you are not subscribed to MunroLive, transition to sustainable transportation is postponed for 1 minute
What makes you think that there is no plan B? I'm pretty sure that the patent shows plans below 40 degrees. (I think that people have reported it working at temperatures that low as well.)
Well, I've seen reports of failed HP compressors and no heat.
HP, that can go down to -30*C is cool, but it is plan A2, not B, as it still requires compressor.
-40*C, in that I do not believe. Condenser is not big enough for that.
And extracting heat from drivetrain/battery doesn't count. No heat when stationary (preheat).
HP, that can go down to -30*C is cool, but it is plan A2, not B, as it still requires compressor.
-40*C, in that I do not believe. Condenser is not big enough for that.
And extracting heat from drivetrain/battery doesn't count. No heat when stationary (preheat).
The motors can provide heat while stationary. As can the compressor, and the HVAC fan.
A lot has changed during those years, Heat Pump is awesome, but I'm not happy that there is
no plan B for heat generation on those new models. HP's usually struggle at -20*C or below.
Also problems with frost near freezing, -1*C. I'm not sure how to defrost at highway speeds.
Louvres must be really airtight
I think you may be missing the point that Tesla heat pumps are liquid-to-liquid
