Jump to content

Server Lease Renewal/Software Licenses

Our yearly server lease, software licenses, as well as hardware operating costs, ARE due Dec 6th, 2021. 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)

2011 Cayenne S - P0599 Thermostat Heater Control Circuit High


Recommended Posts

Hoping that someone can provide some insight on this one. I replaced the water pump and the thermostat (cleaned the intake valves at the time as well) on my wife's Cayenne in April 2020. I had the coolant system pressure/vacuum bled by a shop that I trust, and the car has been running without issue for the past year. Recently, the CEL came on, the code of P0599 is showing up, and the car is overheating when pushed on the highway. Temp stays at 201F when idling and when driving around normally, but I can get it to climb to the 220+ range, if I accelerate hard on the highway. 

 

I checked, and it doesn't look like this car has the solenoid actuated shutters for the radiator. I don't believe that it has the solenoid actuated water pump, either. There's nothing clearly blocking the radiator in the front. No coolant loss, and no milky oil. I'm honestly at a loss on this one, and hoping someone has some advice, before I just throw a thermostat at it and hope for the best.

Link to comment
Share on other sites

  • Moderators

Welcome to RennTech :welcomeani:

 

Thermostat may have failed; I would check the hose running from the engine to the radiator when the car is running and warmed up; if it is cold, either the thermostat is stuck, or radiator is blocked.  You can check the radiator for blockage by using a non-contact pyrometer to see if some of it runs cold or cooler when other sections are hot.

Link to comment
Share on other sites

26 minutes ago, JFP in PA said:

Welcome to RennTech :welcomeani:

 

Thermostat may have failed; I would check the hose running from the engine to the radiator when the car is running and warmed up; if it is cold, either the thermostat is stuck, or radiator is blocked.  You can check the radiator for blockage by using a non-contact pyrometer to see if some of it runs cold or cooler when other sections are hot.

Appreciate it. I actually had to look back at my profile, as I saw this was my first post, but I've been lurking on here for over 10 years. Been a great resource, I should really contribute. 😉

 

I'll check temps across the radiator, but I'm fairly confident that the thermostat is opening at least some of the time, as it doesn't overheat when idling, and temps were in the low 90's, last time I let it sit. Really annoying, as it's one of those intermittent issues.

Link to comment
Share on other sites

  • 3 weeks later...

Did you use a Porsche water pump?  It sounds like a loose impeller or otherwise failed water pump.  Able to circulate enough coolant when idling, but not enough when under load.  Thermostats generally (not aways but usually) fail open.  And how are you reading the coolant temperature?   Hopefully not by the heavily buffered coolant temperature gauge - that's about as useful as an overheat-idiot light. If it reads hot something is really wrong.

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.