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)

Under dash noise passenger side and AC blows hot


Recommended Posts

A clicking/tapping noise under the dash on the passengers side occurred this morning as I started my 1999 996. At the same time the A/C blew hot air. It sounds like the compressor is kicking in but hot air is all I get with the intermittent under dash noise. As always, you folks thoughts are very much appreciated.

Edited by Doug
Link to comment
Share on other sites

It seems that there may be a couple of things going on here. The compressor very possibly gave up the ghost but this under dash sound is perplexing. Hopefully someone here with a shop manual can post here whats down under the airbag that is a switch, a relay, or anything else that could cause a mechanical clicking noise as though something is trying to turn on and off. Thanks for your help.

Link to comment
Share on other sites

Thanks for responding Richard. It is difficult to pinpoint it that precisely but it's definitely a relay or actuator of some type that is located behind or very close to the passenger airbag. It almost sounds like a pump clicking as it pumps a line up to pressure and then stops after 10 or 15 seconds. A diagnostic would be nice but am just trying to figure out what I may have and whether it could be a DIY.

Is the noise coming from the passenger side dash vent? That's where the interior temperature sensor is located, and there is a small fan which blows air over it.

A diagnostic check should show up any faults in the control system.

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.