heater/ac question

The ICE has to warm up. The system will not turn the fan on until some heat can be delivered. You should notice the fan coming on after you drive a bit

 

Within a minute or so. I am sure outside temp have an effect. The system is monitoring the coolant temp. The fan will start slow and increase in speed as the ICE warms up.

 

Um this is the same in any car you drive. Anyone who has driven a car should've figured out turning on the heater right away on a cold morning will do nothing but blow cold air. The heater will only start blowing in hot air when the engine is warm enough to start heating the air. A cold engine won't heat the car, and the heated air has to come from somewhere.

In the summer, the A/C works by using the freon, which is available 24/7, regardless of engine temperature. That's what's confusing you. So its normal for the car to delay turning on the heater. It's just waiting for the heater block to warm up.

 

Some modern cars, mainly diesels, have a supplemental electric heater that starts warming the air from the vents within a minute or so.
I suspect that the Prius has one too because slightly warmed air comes through the vents on mine after only about a minute even if the ICE has not yet run and it's in EV mode.
Either that or the heat is from the inverter coolant.
Perhaps someone who knows more tech about the Prius workings could confirm ?

P.s. has anyone noticed that if you set the climate control to full heat (HI) and then turn it off then the heat still comes through, same with the Gen2 as well.

 

Have you tried adjusting the fan speed manually ?

 

try raising the temp more. If you got it set on 75 and it's 72 outside you wont notice much. If there is a bigger difference in the inside temp and what you have it set on it will turn the airflow to the footwells and blow hot air down there.