Servomotor from hell

Surprise!! found this place by google B1441 and B1448!
I have the exact same issue with my Prime 2019, precisely the same situation! The dealership Tustin Toyota asked for $3,000! Sucks! Prime suddenly started to blow high temp hot air 2 weeks ago! nothing wrong with the compressor and 134a！


I love this topic!
Servomotor from hell

 

And now me, too. 2019 Prius, B1441 and B1448, dealer wants $5000 to disassemble the entire dashboard and cooling system, including draining the refrigerant from the system...

JacobPrime, did you ever get yours fixed yet?

My wife wants me to just bypass the engine coolant around the heater core so it can't blow hot air anymore...

 

I managed to replace the #2 radiator damper servo without removing the dash and the entire heat/cool unit. A YouTube video pointed the way with a tool recommendation for a long, tight space, right angle screw driver. Still a tedious, difficult remove and replace. Not for easily discouraged folks. The good news is that my total cost, tool and part was about $150.

I took the old unit apart. The servo motors were easy to test and both seemed to be fine. There is a third component that seems to simply follow the motion of a large gear and connected linkage external to the servo unit. My best guess is it’s a position sensor of some kind? Does anyone know? It’s the wheel with 2 connecting pins that spins freely in the servo housing when not installed. The servo motors seeming to work fine in the old unit was a surprise and I’m wondering what the fault was as the system works perfectly after the replacement.

thanks! Love this forum.

 

We are also trying to replace this part and found the YouTube video. We bought the long tool (usually for motorcycle carburetors!) Have the correct replacement part from a Toyota dealership. Definitely not for the faint of heart! The screws are in so tight. And the torque on the tool is minimal. Any pointers on how to get them out? Thank you and thanks for this fantastic forum!

 

I'm having this problem now with my 2017 Prius, they want to replace all 4 servo pieces.
I don't understand what I have to do now, I don't want to pay them 960$ for this.
I just want my Prius to blow cold air man, English isn't my first language so the thread was a bit hard to understand but should I bring the car to car shops (not Toyota's specialist) to resolve my problem.

I really need some help here.

 

Thank you so much! My dealer quoted me $7400 for this, so this saved me a lot of money. I'm going to write up my experience.

Symptoms: My car is a 2022 Prius Prime. The air blows HOT even when temperature is set to the lowest (LO). It doesn't matter if AC is on or not, still blows hot. The HVAC controls are frozen for about 1 minute after you turn on the car.

Dealership says the error codes are B1441, B1442, B1448. Dealer wanted to replace "Receiver dryer and charge system, heater box assembly" with over $4000 in parts. Google pointed me to this video "4th Gen Toyota Prius AC blowing hot air". That same dealer sold me the servo part for $180. The long carburetor screwdriver is expensive but you need it for the back screw. For the front and bottom screws get a smaller one: "Right Angle Screwdriver Set - 20pc 1/4 Ultra Low Profile Mini Ratchet Wrench".

Remove the glove box and the panel under it. Unplug the cable from the servo (press the white tab down and it'll come off easily. Put a towel under it so the screws don't fall into the cracks. Unscrew the 3 screws (front, bottom, and back) and the servo should slide out. You'll have to get on your back and stick your head into the footrest to see the back screw.

To line up the T shape gear, plug the cable into the new servo (don't need to install it yet). Then turn the car on and wait. Don't change any settings. After 1 minute or so you will see the T shaped gear move into the same position as on the old servo. Turn the car off and unplug. The white spinning piece should fit easily, and with the T gear in the right position the servo should slide back into place and line up with the screw holes. Then just put the screws back and you're done!