AC only blows cold when temp is set to "LO"

I don't think I've ever used the "auto" function. I never thought it was accurate. It would always start at a really high speed and I normally don't require that amount of air. I normally only set mine using the manual setting, fan speeds from lowest level 1 to around the middle area.

I'll have to try the Auto setting on my car and let you know if it's different

 

Just tested my 2015 on Auto.....outside temperature was 76 degrees, auto setting at 70. Air was coming full blast and was cold. Set the temperature to LO and it was still full speed, still cold....no change.

 

I run our 2010 most of the time on Auto and it works and changes speed.

On a Jeep Cherokee my old man has (as well as on a Chevy Prism), had a similar issues you are describing. Ended up being a bad resistor and once changed, everything returned to normal. Both models were known for this failure.

Do you have a wiring diagram for the circuit? Being the resident librarian, I assume you do, but thought I would ask .

Something’s telling the AC to only run in Low setting. The fan is working and kicking on when requested?

Good luck .

 

Yes I've watched some youtube videos about this resistor problem on cars.......

 

what a great excuse to buy a 2015!

 

Canada doesn't really need AC

 

Just a guess here... I had to look up the weather for Vancouver BC - High 62 Low 42

I just went out to my 2010 & powered it up. When I bring down the temp reading it goes 66-65-Low.
Perhaps if ambient is <65 strange (ie different than expected) things happen?

 

you'd think, but mendel has hot hands.

 

Or maybe a used PIP with some of the nice rims procured earlier in the year.

 

no spare = no way.

 

52° outside this morning so I can test this.
Prius in "Ready", press :"Auto" climate control button, temperature setting to "Low", press "AC" button - fan ramps up to maximum & fan blows cold air.
When I raise the temp setting from "Low" to 65° the fan immediately stops. The fan does not "ramp" down slowly but just stops.
If I move the temperature setting from 65° back down to "Low" the fan quickly ramps up to maximum speed.

 

If the outside temp is close to the set temp (+or- a few degrees) operation of the "auto" A/C system is erratic. It warns of this in the owners manual. Pearl S is erratic in those conditions. A little note for all - A/C Auto means heating and cooling is automatic. It doesn't mean the cooling system only.
Best to try "low" versus perhaps 24C.
I often get heat with the system off but just the fan turned on if the set temp is higher than ambient. I reasoned you can't really turn off the heater unless you use the set temp.

 

I keep mine in Auto all of the time. I rarely adjust anything except temp setting and mode, mostly in fall and spring when temp can change between heat in morning and AC in afternoon.

If I lower mine to LO or HI it goes to to full blast as indicated. To me it always controls as expected.

Of course I live in a relatively mild environment.

 

Mr. Check the Obvious here.

You are in Canada and it is November.
Might that have something to do with the behavior you are seeing ??

Edit: OK I see that has mostly been covered. Just one more comment: You might need to pick the right day to take it in for a diagnostic.........because you might not be able to "hold their feet to the fire" if it is cold and cloudy when they look at it.