11 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 Turbo Tip running cool
Reported or suspected cause
thermostat
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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Leading evidence: 'thermostat' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'thermostat' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check coolant temperature sensor' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
You need to get them to check the vacuum tube (14) to where it connects to the throttle body.
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Suggestion · Original poster
The guys did the check with IR gun and then removed it.
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Suggestion · Original poster
Anyway - we'll try the car this morning and see if it's healed itself - and give Parr a ring on monday, they did a huge service and checked everything prior to the track day, so at least we know the rads have been changed, air con rads changed, evaporator, coolant, pipes etc.
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Suggestion · Original poster
Anyway - we'll try the car this morning and see if it's healed itself - and give Parr a ring on monday, they did a huge service and checked everything prior to the track day, so at least we know the rads have been changed, air con rads changed, evaporator, coolant, pipes etc.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
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Generation: 20261027T061840Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi all, the missus treated herself to a 996 Turbo Tiptronic and took it on it's first track day yesterday. She had a great day and the car didn't miss a beat.
On the way home she said that the temp was reading low, we pottered home and parked up - tried to check the oil level and the computer said the car was not warm enough. Odd, after a good thrashing and then a 30 mile run home.
Right up to the last session and leaving, the temp was around 80 - it then dropped to just over 40 (not sure when - only noticed on the drive back).
I've done a few google searches and looked through the 996 Companion and Richard H's new book (great book, thanks) and have seen the odd reference to the Tiptronic Coolant Change over valve.
Anyway - we'll try the car this morning and see if it's healed itself - and give Parr a ring on monday, they did a huge service and checked everything prior to the track day, so at least we know the rads have been changed, air con rads changed, evaporator, coolant, pipes etc. were all fine, and the car ran fine right up to parking up. The coolant level has not changed.
Does anyone have any ideas what could cause a 20-40 odd degree drop in temperature - anyone seen this behaviour before?
Sounds like your thermostat has stuck wide open. I don't suppose it is easy to check as everyhting is underneath the car. If the feedpipe to the radiators gets warm very quickly from the pipe that exits the thermostat housing shortly after startup, the thermostat is opening early. Can be checked easily with an IR heat gun.
Alasdair
Check the coolant temperature sensor? It could be faulty. Get someone with a PIWIS/PST2/Durametric and see if any faults are logged. If not have a look at the live data and see what temperature is showing. For the live data, a general OBD diagnostic reader with live data capability is sufficient.
Thanks guys, we didn't get chance to use or look at the car today.
I'll probably give Roger at Parr a ring just to let him know that the car ran well and give him Richard's info. on the hiccup.
I'll put it up on ramps on Wedenesday and have look. I'm hoping it'one of the pipes Richard has pointed out.
We put the car on the ramps, removed the cover under the gearbox and had a qucik look at the Tiptronic change over valve - the hoses all appeared fine and when the car was started the valve moved either open to closed or vice versa. We spoke to Roger and have it booked in for the 22nd - I'll let you know what happens.
Take a look at this post, and see if it sounds familiar: http://www.porscheclubgbforum.com/fb.asp?m=631543
Of course, I might be totally wrong, but I have heard this more than once before.
As Alasdair suggested it was the thermostat. The guys did the check with IR gun and then removed it.
It's not something I've heard of on 996's - but never mind all done now and the wife will be happy to have the car back.
Edited to say - Richard, I looked at that post before hence the Tiptronic guess - but, that is almost what Caroline's Turbo was doing. When I got under the car the vacuum valve was free to move by hand and moved when started (opened or closed) - my thinking was - the valve would be open if any of the pipes failed - so the transmission would be cooled - and have the valve close when starting the car, but didn't really have a clue. I passed the info onto Parr and let them decide (printed the thread off).
Anyway - thanks for your help guys, much appreciated. I'm sure there will be many more quesions as Caroline uses the car more. She wants to have a few more track days in it now!
Cheers
Ben
Well, that's another one for the memory bank. I've never heard of it on a 996 before, but there is always a first time for everything.
Thanks for updating us with the outcome.
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