2010 Prius Climate Control temp not changing

Would those be the console buttons, the steering wheel buttons, or both?

(No, I have no experience with this issue.)

 

What happens when you lower setpoint all the way down to LO? What does your fan speed do if you have everything in automatic?

 

That actually sounds normal.

 

it's a variable speed compressor. i don't know, but it sounds like the edu or the compressor itself, the switch and interface seem fine.

 

ECU?? Which I'd guess is Electronic Control Unit. Man: misspelled acronyms can bring a discussion to a stop. Well, unless no one fesses up they don't know what it is.

 

On a warm day, if you leave it on AUTO and 84 degrees for a while until things stabilize, then lower the temperature setting by 10 degrees or so, does anything change?

It's normal to have some cooling at 84 or 85 degrees, but no cooling (heating, in fact, bizarrely!) if you try to set a higher temperature, even if the inside temperature is well above 85.

 

sorry, ecu, missed the spellcheck. i'm just thinking the button goes to the electronic control unit, which then tells the compressor what speed to run at. yes, you are getting some cold air, so the compressor is working, but possibly not changing speeds. you're probably going to need a tech stream diagnosis.

 

Two tests:
1. If you turn the temperature all the way down (MAX LO, I think?), do you get cold air?
2. If you turn the temperature all the way up (MAX HOT, I believe), do you get heated air?

If the answer to both of those is yes, I would expect that your system is behaving normally. The temperature setting is a target for the cabin, not the temperature of the air that is being blown. It is meant to be run in full Auto mode most of the time, and you should set the temperature to whatever makes you comfortable. The car will adjust the amount of cooling and use an appropriate fan speed to get the cabin to that temperature as quickly as possible.

My guess is that you had the fan speed set to manual, and the cabin temperature was something around 85 (or hotter, if you had to go all the way to MAX HOT to get the air to warm up). As long as the set temperature is lower than the cabin temperature, it will blow cold air to try and get it to your set temperature. Once you max the temperature out, it will blow hot air. Adjusting the temperature to anything lower than MAX HOT will have a negligible effect on the temperature coming out of the vents as long as the cabin is hotter than the set point. If the set point is close to the current temperature, it will reduce the fan speed and the power to the A/C compressor, though.

That's my guess, anyway. If you've owned your car for a while and you've noticed a definite change in its behavior, then I'm probably wrong. But my guess is that you're perhaps new-ish to the Prius climate control system?

 

I’ve got a similar issue. My ac is either full cold or hot. The fan speed used to change automatically as I changed the temp but it does not change anymore. Is there a setting to reset?

 

That can come in two forms:

• You get cold when you set the temp all the way down to LO (below 65), but for any other setting you get hot.
• You get hot when you set the temp all the way up to HI (above 85), but for any other setting you get cold.

Which one ya got?