Are you sure the A/C is off when you think it is off? The A/C typically runs in most modes. Turning the HVAC system totally off would ensure the A/C is actually off.

 

This raises a couple of questions for me. How does one completely turn off the climate control? Also, is it possible to completely shut off (e.g. close) the center dash vents? I cant seem to close my center vents completely so that there is no air flow through the vents and it drives me nuts....lol

 

AC will turn on, like it or not, every time selector is in any position to blow air onto windows. AC light may or may not come up.

 

@agent_smith There is an off button by the left side temperature knob.
I don't know the specifics of the system Toyota uses but my other vehicles with electronic systems, they would close all the air selection paths when the system was turned off. On cars with more basic systems, I was able to select recirculate when the system was off, to shut off the natural flow from outside.

 

Most of my cars will run the fan for at least 30 seconds; this is literally on for 2 seconds, off for 30 seconds, repeat indefinitely.

Sent from my Pixel 3 XL using Tapatalk

 

Well, you have electric AC compressor/system, so it needs to be compared against another hybrid Highlander function, not against the belt driven ones. Worse come to worse, you have warranty.
Also, if you have any "on windows" or defog position, you can NOT turn AC off, no matter how you try. It is embedded into DENSO system and AC light won't even come up or show on display.
But that's beyond the point. Someone with HiHy needs to chime in, how their comp/fans cycle or, you go check vs another HiHy in same situations. That does sound not right though. Unless you confusing rad fan with AC fan.

 

Well, you have electric AC compressor/system, so it needs to be compared against another hybrid Highlander function, not against the belt driven ones. Worse come to worse, you have warranty.
Also, if you have any "on windows" or defog position, you can NOT turn AC off, no matter how you try. It is embedded into DENSO system and AC light won't even come up or show on display.
But that's beyond the point. Someone with HiHy needs to chime in, how their comp/fans cycle or, you go check vs another HiHy in same situations. That does sound not right though. Unless you confusing rad fan with AC fan.

I have a 21 hybrid platinum and the cooling fan cycling you're describing is not something I've experienced. To answer your question about turning off the HVAC system or A/C compressor you have two options on the platinum. You can turn off the entire HVAC system using the physical off button right below the auto button. If you want to keep the system on but inhibit the A/C compressor go to to the climate display and press the A/C button until the blue line is grey or off. See my attached picture for what the display looks like when the A/C is switched to off.

 

And we need to confirm, it is AC fan, not rad fan. AC fan is one on the driver side.
But yes, 2 sec cycle is not normal.

 

Not sure if this helps. My 21 HiHy Xle does something similar. After driving and placed in Park, the fan cycles on for 2 secs then off 10 (the fan does not even come to a stop before the next cycle). Mine only has a single fan for the radiator so not sure what's triggering it but the gasoline engine seems off.

 

Thanks. I'll do some testing this weekend when I get to drive the car.

Sent from my Pixel 3 XL using Tapatalk

 

Ok, so it was 55 degrees outside and cloudy today, and while parked I had the HVAC temperature set to 70 degrees. With the AC on AUTO, the fan cycles on regularly for 4 seconds at a time. Turned the AC off and the cycling stops.

Sent from my Pixel 3 XL using Tapatalk

 

Well, as we mentioned - you need to compare to identical vehicle. 4 sec cycling does not appear to be unusual.

 

So we have similar situation with our hybrid.

Sitting in the parking lot, ICE off, hvac on in auto mode. I am sure that the a/c is running because it is delivery cold air (vs ambient) out of the dash vent. Water is dripping out beneath the car at the front and rear right of the vehicle which seem to be the area for the evaporator which reassure that air compressor is running. I am not sure if the Highlander hybrid compressor is a variable type or not and how it adjust the load pending the cooling needs.

Anyway, after several different scenario that I have been paying attention to, the fan does kick in like for a second and off or for 5 seconds and off and so on. This is depended on the ambient temperature. For the 1 second on and then then shut off, the hvac is in auto at 73*F and ambient is 74*F-75*F and full sun shine day. Other scenario is hvac set to auto 73*F, outside is ~82*F and the fan would run for 5-6 seconds and off on full sunny day. Today with the hvac set to auto 73*F, outside was 94*F and the fan would stay running a lot longer, but I did not really sit there to try and time it. Again, today was sunny as well.

Either way, I really hate it when the fan was kick on for a second and off. It sort of annoying if you taking a nap in the car and seems to lower the longevity of the fan motor by loading and unloading it like that. I rather sacrifice battery power to have it stay running longer. BTW, all of these was on ECO mode, I need to see what it would do in normal but I am not going to be able to see any cool weather anytime soon because we are about to hit the 100+ soon here in the south.

 

Yes. I find same problem. But put drive it will ok. I am mechnic, I record fun duty cycle, 35 second when park