2010 Prius IV - Hot AC when Engine Runs - Toyota Prius Forum : Toyota Prius Forums
 
LinkBack Thread Tools
post #1 of 7 Old 03-15-2020, 06:52 PM Thread Starter
Junior Member
 
Join Date: Mar 2020
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Default 2010 Prius IV - Hot AC when Engine Runs

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.
JoeMartin is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 03-15-2020, 07:02 PM
Super Moderator
 
Join Date: May 2014
Location: N. Central Florida
Posts: 477
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 50 Post(s)
Default

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.

'17 Prius C-4
Easy Rider is offline  
post #3 of 7 Old 03-15-2020, 07:04 PM Thread Starter
Junior Member
 
Join Date: Mar 2020
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Default

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.
JoeMartin is offline  
 
post #4 of 7 Old 03-15-2020, 09:42 PM Thread Starter
Junior Member
 
Join Date: Mar 2020
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Default

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.
JoeMartin is offline  
post #5 of 7 Old 03-23-2020, 09:23 AM Thread Starter
Junior Member
 
Join Date: Mar 2020
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Default

Verified replacing the servo fixed the issue. It was caused by the servo seizing up and not moving the blend door.
JoeMartin is offline  
post #6 of 7 Old 10-02-2020, 12:55 PM
Junior Member
 
AmeliaHornsby's Avatar
 
Join Date: Aug 2020
Location: New South Wales Hornsby
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Default

Hi everyone
AmeliaHornsby is offline  
post #7 of 7 Old 10-05-2020, 10:55 AM
Junior Member
 
Join Date: Oct 2020
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Default

hello!
robertdyerkms34 is offline  
Reply

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome