Jump to content

The RennTech.org community is Member supported!  Please consider an ANNUAL donation to help keep this site operating.
Click here to Donate

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)

Recommended Posts

Loren (and all),

after completing the coolant tank R&R this weekend, i let the car idle up to temperature.

I never heard the low speed fans come on at all, but when the gauge got just into the 0 in 180, the high speed ones kicked in. I put the AC on and Off to see if there was a speed change, but it felt and sounded the same (AC runs fast seepd right ?)

Q: I read there was a fuse for the low speed that blows after getting wet by driving thru puddle sometimes. Where can i find that fuse (and do you have a Part number ?)

Anything else to check ?

Thanks

Share this post


Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.

The radiator fan fuses are C8 and C10.

I doubt they would run at all with the fuse blown.

I wonder if you have a bad fan ballast?

Where are you located?

Share this post


Link to post
Share on other sites

The fans do not go into high speed just beause the A/C is on. It must also meet the engine temperature requirement. So get the engine hotter and try it.

You might also switch the low and high speed fan relays to see if there is a problem with one of them. Relays 19 and 21(low) and 20 and 22(high).

Edited by 1999Porsche911

Share this post


Link to post
Share on other sites
The radiator fan fuses are C8 and C10.

I doubt they would run at all with the fuse blown.

I wonder if you have a bad fan ballast?

Where are you located?

I work in Santa Clara and Live in Mtn View.

I thought the AC kicked the fans into high speed no matter what the engine temp ??

I dont think ive ever had them run at low speed...

In stop and go the engine temp will creep up and if i hit the AC it stabilizes again.

After the coolant tank change i got the chance to just let the car get all the way to temperature and the fast speed kicked in, but never saw the low speed.

Where is the fan ballast and how can i test this. Im an engineer so have access to some tools and im quite handy :-)

Thanks

Share this post


Link to post
Share on other sites
The fans do not go into high speed just beause the A/C is on. It must also meet the engine temperature requirement. So get the engine hotter and try it.

You might also switch the low and high speed fan relays to see if there is a problem with one of them. Relays 19 and 21(low) and 20 and 22(high).

Just ran to the parking lot and tried this.

Car hasnt been driven for 7 hours so is cold.

No fans if i just run the engine. Hit the AC and the fans come on fast in a feew seconds.

There are relays for each side ? Neither low speed works and both hi speeds work.

Is there a layout for the relays ?

Thanks

Share this post


Link to post
Share on other sites

When your coolant temperature is below around 200F (don't have the exact temp at my finger tips) turning the A/C on will only turn on the LOW SPEED FANS. If your high speed fans come on, something is wrong. If you have never heard the high speed fans, you might mistaken the low speed for high speed. However, when the high speed is on, you will definately know.

Test the high speed fan by grounding the appropriate fan relay and you'll hear what high speed sounds like.

Edited by 1999Porsche911

Share this post


Link to post
Share on other sites

The fan ballast is your problem I just replaced mine last weekend each radiator fan takes an individual fan ballast and they cost about $120.00 Ea.

I had the same problem the fans would only turn on high speed.

Share this post


Link to post
Share on other sites

Are the fans ever supposed to stay on for a certain amount of time after you shut the car off?

Edited by eurotrashed

Share this post


Link to post
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...

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.