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Discussion Starter #1
Hey guys!

Recently bought a 2010 Prius IV with 132k on the clock and it runs beautifully.
When I got in it I noticed the AC was nice and cold and didn't think too much on it.
Purchased it and drove away.

Shortly after, however, I noticed that whenever the engine ran the AC would no longer blow cold.
Checked it at idle with engine off, and AC gets down to ~40 degrees, but gets up to over 90 with the engine running and changes over to hot almost immediately once the engine runs.

I checked the codes on the AC itself and it has error code 23, but I don't believe the sensor is malfunctioning. The compressor is running when the engine is either on or off.

I was thinking maybe a blend door issue, but not too sure on that one.

As soon as the engine turns off the AC starts to get cold again.

I noticed that part 063800-1100 (Factory AC Heater Servo Regulator) does not move at all.
Like... Can't even move the gears attached to it by hand. Super stuck.
Would that cause this issue?

Thanks for the help in advance.
 

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The heater function works either by controlling the air flow through the heater core (blend door) or by controlling the hot water that goes into the core. I don't know which system that model uses.

If that servo does what it sounds like.......then it definitely could be the problem.

While I don't usually advocate replacing parts on a guess, if that part is easy to get to AND it isn't very expensive, it might be worth a shot.
Note: A "servo" is usually designed to "lock" in whatever position it was last left in.
 

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Discussion Starter #3
It is pretty easy to get to, fortunately.

I'm actually going to try just taking it off and see if I can manually move anything in there.

The part is only around $50 used. I'll report what I find.
 

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Discussion Starter #4
Figure I'll update this for whomever else has this issue.
Issue was that the part mentioned would not move the blend door.
The servo was completely seized. I have manually moved the blend door and it temporarily resolves the issue.
I am buying a new servo and will report back.
 

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Discussion Starter #5
Verified replacing the servo fixed the issue. It was caused by the servo seizing up and not moving the blend door.
 

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The price was about 300$. Is it ok? Would it be cheaper if he replaced it manually?
It is a bit late to be asking that question, isn't it ??

The price seems reasonable.
He probably could have saved about $150 in labor if he did it himself........IF he was able to properly diagnose the problem first.
 
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