Jump to content

92' Sc400 Blows Cold Air In My Heater


magat1

Recommended Posts


If you search the older section of the SC forum and look for "heater control valve" or "air mix servo motor" you should get some hits. These are the two causes I know of for cold air blowing. (This is from experience) The first thing (and easiest) to check is the heater control valve which is located in the engine bay, on the firewall, passenger side. It is near the top of the engine bay and very easy to access. There is two vacuum lines going into the valve. You can try swapping the vacumm lines and see if it works. If it does, you can leave it this way until you can get a new or used valve. If this does'nt work, you can perform a self diagnostic using the built in diagnostic of the climate control system. While turning the car key from off to the start position, simultaneously hold the Temperature control knob and the recirculate button. The system will go into self diagnostic. It will automatically index through the various system settings and flash a code if there is a problem. Mine came up with a code 41, which means there was a problem with the air mix servo motor. If you do the test in low light, you may get a code 21, this is the solar sensor circuit and is nothing to worry about. Try the tests and let us know.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



×
×
  • Create New...

Forums


News


Membership