What fan is running ?

[paul_rivianlife]

Figured an interesting behavior. I do not have my wall charger yet but am using the travel charger in the meantime. I have it plugged into the wall next to the R1T. I have plenty of charge so it is just plugged into the wall, not the vehicle. Noticed this AM when I got up and did not have phone/keys with me, went out into the garage and the fan was running. Assuming it was running all night. Drove it this AM and parked it back in the garage. Fan was running all morning. Wondered if wall charger had anything to do with it so I unplugged the travel charger from the wall. Fan did not turn off. Pulled the vehicle out of the garage then back in. It auto-locked and fan turned off. Hmmm. So, repeated the test, plugged the charger back in, out/in the garage, fan on. Unplugged charger, out/in the garage, fan off. Interested if anyone can repeat the behavior. I will continue to test as well.

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[trez63]

Figured an interesting behavior. I do not have my wall charger yet but am using the travel charger in the meantime. I have it plugged into the wall next to the R1T. I have plenty of charge so it is just plugged into the wall, not the vehicle. Noticed this AM when I got up and did not have phone/keys with me, went out into the garage and the fan was running. Assuming it was running all night. Drove it this AM and parked it back in the garage. Fan was running all morning. Wondered if wall charger had anything to do with it so I unplugged the travel charger from the wall. Fan did not turn off. Pulled the vehicle out of the garage then back in. It auto-locked and fan turned off. Hmmm. So, repeated the test, plugged the charger back in, out/in the garage, fan on. Unplugged charger, out/in the garage, fan off. Interested if anyone can repeat the behavior. I will continue to test as well.

Hmmm. So you’re thinking the car is communicating with the travel charger and that’s keeping the fan running?
sounds very unlikely. I can’t test this with the wall charger unless I want to turn the breaker off every time I try …

 

[ajclemente]

Any updates on this, I am noticing the fan running every morning with several miles of my range.

 

[Max]

It is not that reassuring to see RJ is asking us if we have figured out how to fix R1T

then again, at least he is asking.

 

[trez63]

I was told by support that the car is trying to keep the battery temp at exactly 70F. So for now, you will hear the fan if it's 71F to cool it, or at 69F to heat it. I know it doesn't sound like it makes sense, but that's what I was told. I was also told they're working on changing this ...

 

[Craigins]

I was told by support that the car is trying to keep the battery temp at exactly 70F. So for now, you will hear the fan if it's 71F to cool it, or at 69F to heat it. I know it doesn't sound like it makes sense, but that's what I was told. I was also told they're working on changing this ...

Makes perfect sense. Someone developed the software specs as follows:

Use climate control to keep battery at optimal temperature.

Then the software engineer asked the battery engineer what the optimal temperature was. They replied 70.

Software engineer takes the 70 degrees and uses that as the temperature point in their code.

Where what should have happened was everyone sitting down to discuss what temperature range the battery should sit at while not in use.

My gut feeling is the auto level suspension is the same way. People are saying that their truck is adjusting suspension at stop lights.

Just poorly written software specs and amateur software developers.

 

[Attesan997]

Makes perfect sense. Someone developed the software specs as follows:

Use climate control to keep battery at optimal temperature.

Then the software engineer asked the battery engineer what the optimal temperature was. They replied 70.

Software engineer takes the 70 degrees and uses that as the temperature point in their code.

Where what should have happened was everyone sitting down to discuss what temperature range the battery should sit at while not in use.

My gut feeling is the auto level suspension is the same way. People are saying that their truck is adjusting suspension at stop lights.

Just poorly written software specs and amateur software developers.

Kinda makes sense ( in a doesn't make sense at all sort of way) considering there were several anecdotal references to the software side of things being rushed to get trucks out the door. And the many owners here reporting a fan running while not in vehicle. Hopefully this bears out in the form of software updates.

 

[s12dxer]

My fan has been running quite a bit more since 2022.15.0 update. I presume its HVAC as it seems to shut off when the truck is locked and "asleep".

 

[okplayer]

Figured an interesting behavior. I do not have my wall charger yet but am using the travel charger in the meantime. I have it plugged into the wall next to the R1T. I have plenty of charge so it is just plugged into the wall, not the vehicle. Noticed this AM when I got up and did not have phone/keys with me, went out into the garage and the fan was running. Assuming it was running all night. Drove it this AM and parked it back in the garage. Fan was running all morning. Wondered if wall charger had anything to do with it so I unplugged the travel charger from the wall. Fan did not turn off. Pulled the vehicle out of the garage then back in. It auto-locked and fan turned off. Hmmm. So, repeated the test, plugged the charger back in, out/in the garage, fan on. Unplugged charger, out/in the garage, fan off. Interested if anyone can repeat the behavior. I will continue to test as well.

Paul,

What you're hearing is the cooling fan running. The HV battery pack likes to live at a pretty specific temperature, and your truck will condition (cool or heat) the pack as necessary, whenever necessary. Ambient temperature will have an effect on this, but is not the only determining factor. You'll usually start noticing the fan operating sometimes once ambient temperatures start creeping near the high 70's F. If you live where temps regularly hit 100 degrees F, you'll hear the fan at 100% duty cycle at times. It can be pretty loud in those occasions!

 

[s12dxer]

Paul,

What you're hearing is the cooling fan running. The HV battery pack likes to live at a pretty specific temperature, and your truck will condition (cool or heat) the pack as necessary, whenever necessary. Ambient temperature will have an effect on this, but is not the only determining factor. You'll usually start noticing the fan operating sometimes once ambient temperatures start creeping near the high 70's F. If you live where temps regularly hit 100 degrees F, you'll hear the fan at 100% duty cycle at times. It can be pretty loud in those occasions!

Should the fan be running even when the truck is parked, locked, and not plugged in?

 

[Attesan997]

Should the fan be running even when the truck is parked, locked, and not plugged in?

On my Tesla I only hear the fan running once the interior temp hits about 100º F and above. I get keeping the battery at nominal temps if someone is inside the vehicle or it's plugged in. But to your point if the vehicle is parked and locked, while not being plugged in, unless the interior temps are high enough to cause damage to the electronics I'm not sure why the fan would be triggered to run.

 

[okplayer]

Should the fan be running even when the truck is parked, locked, and not plugged in?

It can. And it's not uncommon.

 

[okplayer]

On my Tesla I only hear the fan running once the interior temp hits about 100º F and above. I get keeping the battery at nominal temps if someone is inside the vehicle or it's plugged in. But to your point if the vehicle is parked and locked, while not being plugged in, unless the interior temps are high enough to cause damage to the electronics why is the fan running.

It's actually not the interior cabin temperature that causes the condenser fan to turn on. It's the high voltage pack temperature that determines the condenser fan logic. No matter what state the truck is in. It can be driving, parked, locked, unlocked, in Ready mode or whatever. The battery management system prioritizes the HV pack, so the fan will run as needed. Most EV's are designed in a similar fashion.

 

[Max]

I was told by support that the car is trying to keep the battery temp at exactly 70F. So for now, you will hear the fan if it's 71F to cool it, or at 69F to heat it. I know it doesn't sound like it makes sense, but that's what I was told. I was also told they're working on changing this ...

This is mighty troubling.

The most important feature they need to implement is the owner’s ability to revert back to one of previous stable versions. We have been complaining about how ineffective CS has been with answering questions for a long time but they are still the same. For the same reason, it is reasonable to assume we will have troubling software updates for foreseeable future. since R1 is really not a finished vehicle, we will have to update but to survive it, we will have to be able to go back and also be able to skip a version or two.

 

[Attesan997]

It's actually not the interior cabin temperature that causes the condenser fan to turn on. It's the high voltage pack temperature that determines the condenser fan logic. No matter what state the truck is in. It can be driving, parked, locked, unlocked, in Ready mode or whatever. The battery management system prioritizes the HV pack, so the fan will run as needed. Most EV's are designed in a similar fashion.

I understand it's not necessarily cabin temps. But what I've observed over the years is as long as it's not extreme heat and/or the car hasn't been sitting in the sun all day I rarely just happen upon the vehicle parked with the fan on. The only exception that comes to mind is after a supercharging session which of course makes sense. From what others have reported on these forums it seems several folks have just happened upon their vehicles with fans running (after sitting for extended periods of time). So there's a distinction between


There's absolutely a distinction between fans running after DC charging, high interior/exterior temps and the below...As its described it sounds like a change will come to resolve the issue.

I was told by support that the car is trying to keep the battery temp at exactly 70F. So for now, you will hear the fan if it's 71F to cool it, or at 69F to heat it. I know it doesn't sound like it makes sense, but that's what I was told. I was also told they're working on changing this ...

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