Mazda 323,Mazda 626 & Mazda 929 Whether the compact 323, the mid sized 626, or the full sized 929, these vehicles remain very popular even though production has stopped.

1992 626 - cold air suddenly goes to hot (vent and AC both)

  #1  
Old 04-05-2015, 10:44 PM
Junior Member
Thread Starter
Join Date: Oct 2013
Posts: 6
Default 1996 626 - cold air suddenly goes to hot (vent and AC both)

My 1996 626 suddenly developed a new problem with the air, both with AC on and with just vent (no AC). There does not appear to be a pattern on when it happens, but it happens more frequently with the AC on than with it off.

With the temperature slider all the way left, on maximum cool, the air will periodically just switch to heat. Just suddenly it will be blowing hot air. Moving the slider to heat and back to cool fixes fixes it immediately. But it will go back to blowing hot air anywhere from a few seconds to a few minutes later. Moving the temp slider back and forth always fixed the problem for a bit.

Any ideas?

Edit: It's a 5 speed (if it matters!)
 

Last edited by little dutch; 04-06-2015 at 05:23 PM.
  #2  
Old 04-06-2015, 10:11 AM
Senior Member
Join Date: Aug 2007
Posts: 1,324
Default

You have a 1992 and a 1996 626 in your post. They are completely different cars so we need to know which one it is. Sorry, but there is a huge difference in the systems.
 
  #3  
Old 04-06-2015, 05:24 PM
Junior Member
Thread Starter
Join Date: Oct 2013
Posts: 6
Default

Oh dangit, I apologize. '96 626 LX
 

Last edited by little dutch; 04-06-2015 at 05:26 PM.
  #4  
Old 04-06-2015, 07:05 PM
Senior Member
Join Date: Aug 2007
Posts: 1,324
Default

It uses an electric actuator to open/close the temp door. It could be a stripped gear in the actuator or it could be the heater control unit telling it to change to heat. The actuators come apart easily to check for stripped gears.
 
  #5  
Old 04-11-2015, 01:04 PM
Junior Member
Thread Starter
Join Date: Oct 2013
Posts: 6
Default

Replacing the heater control unit appears to have fixed the problem. Thanks.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Ferret626
Mazda 323,Mazda 626 & Mazda 929
5
10-03-2013 02:22 PM
Phil from Loreauville
Mazda Tribute
2
07-02-2013 06:37 PM
cugene
Mazda Protege
0
06-23-2008 12:58 PM
dancamp
General Tech
0
03-28-2007 04:28 PM
can6drvr
Mazda6
0
09-15-2006 09:52 AM


Thread Tools
Search this Thread
Quick Reply: 1992 626 - cold air suddenly goes to hot (vent and AC both)


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.