Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Need help PD Air Condition behavior - 4-zone

Recommended Posts

Just finished refreshing suspension, and thought - awesome....good to go for a while. As soon as I thought that, the AC is acting up.

Couple months ago, the condenser developed a crack. Had that replaced by a shop. All seemed OK.
Over last week or so, started to hear squeaking noise coming from under the glove box. Seemed to come on whenever front zone AC was active and set to blow. Knowing about this from reading threads on here, I assumed it may be the blower. 

Get home yesterday, AC working just fine (except the annoying squeaking when blowing air).
Today, get in the car, start, and the rear zone is blowing air (although not cold), but front zone is not blowing any air at all.

Anyone can give input as to what could be the cause?
Few months ago I replaced the blower motor resistor/voltage regulator with a new one (knew from past my old VR was not providing all voltage it was supposed to (about 9 as opposed to about 12V).

Have not yet gotten in there - just got into work, but wanted to see if you fine folk on here can help provide possible places to check.

Thanks again.

Link to comment
Share on other sites

Yes, checked the fuse box.  The 40A fuse (large orange in location 56), is all intact...not blown.

Checked any other fused (location 23 too), and all is OK.



Did more diagnosis on this after work.

Have some codes:
Air Conditioning Section:
353 - Feedback from blower regulator front value below lower limit valu

2193 - Power Supply for blower regulator short circuited to ground


After I pulled the large fuses, checked and reseated them, I turned on the car and the front AC started cooling again. 

It sure points to the blower regulator IMO. 

Funny thing, I recently replaced the blower regulator with a new one. The part number was exactly what it was calling for (have to dig up now if needed).
Will have to get under glove box to looksie at the regulator now.
Guess will follow my blower regulator DIY to do this...lol.

Anyone have suggestions on this?

Edited by ciaka
Link to comment
Share on other sites

  • 4 weeks later...

I'm having the exact same symptoms and I have a new blower regulator (and motor, "as long as I'm in there") on order. 


Mine will run for about a minute, and then stop blowing.  The fan speed indicators show WFO, but the air from the vents wouldn't blow out a candle on a cupcake.


I don't have a Durametric or I'd pull codes and we could compare notes.

Link to comment
Share on other sites

  • 2 weeks later...

Following up....  I just finished replacing both the blower motor and the blower motor regulator in my '04 CTT.  Total time start to finish was maybe an hour.  Once I figured out that I needed to remove the glove box, things went a lot faster...


If I had to do the job again it'd probably be thirty minutes for the regulator; maybe ten minutes for the motor itself.


This has cured my problem of having the blower fans shutting down and a strong humming noise coming from the passenger footwell.


As I was buttoning up the job I thought, "Hey! I should have taken pictures for a DIY!" but... Sorry!

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.