Jump to content

Server Lease Renewal/Software Licenses

Our yearly server lease, software licenses, as well as hardware operating costs, WERE due Dec 4th, 2022. Our current donations have fallen far short of the funds we need to renew. Please remember the RennTech.org community is Member supported so please consider a donation to help...  THANK YOU!

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

  • Admin

From the Cayenne Tech Book

"Coolant temperature sensor

The coolant temperature sensor measures the engine outlet temperature on the cylinder head at the rear left in the coolant distribution pipe. It sends its signal to the Motronic control unit, which passes this information on via CAN. The temperature is displayed by the coolant temperature indicator on the instrument cluster. At a coolant temperature of > 124 °C, the coolant temperature warning light also switches on and switches off again at < 119 °C. The air-conditioning compressor is set to zero demand from a coolant temperature > 117 °C.

Electric fan 1 and 2 for cooling system

Electric fan 1 has a max. power output of 450 watts (when towing a trailer in hot climates 650 watts), electric fan 2 has 300 watts. For infinitely variable control, the duty factor to the end stages of electric fans 1 and 2 is changed from the Motronic control unit, which can be controlled via the actual values. Control of the fan speed depends on:

• The coolant and ambient temperature.

The coolant thermostat starts to open at approx. 80 °C coolant temperature and is fully open at approx. 92 °C. the two infinitely variable fans 1 and 2 are activated at approx. 93 °C and reach their full power output at approx. 105 °C.

• The state of the air conditioning.

If the air conditioning is switched on, the fans are also activated. The max. fan demand is reached from a pressure of approx. 20 bar in the air conditioning. The air-conditioning compressor is set to zero demand from a coolant temperature > 117 °C.

• Above 125 km/h, the speed of both blowers is reduced and is shut down completely at 140 km/h, however, if the coolant temperature exceeds 116 °C it switches back on and back off again below 105 °C.

Fan post-run

To cool the engine compartment when the ignition is switched off, the blowers are switched on depending on the coolant temperature and the last driving cycle (fuel consumption map). The activation threshold is >93 °C or very high specific consumption even on a cold engine. The post-run time lies between 0 and max. 13 minutes, the power consumption is appox. 100 watts. Once the fan post-run has ended, the fans will not re-start with “Engine OFF”. On the Cayenne, the electric coolant post-run pump is also activated via this function. The post-run pump has a power consumption of approx. 10 watts and is located on the cylinder head at the rear and it can be activated by the air conditioning control unit to utilize the residual engine heat."

  • Upvote 1
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...

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.