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996 Turbo Tip running cool

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BodgerBen

PCGB Member
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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.
 
Quite often it is one of the small vacuum tubes to the Tiptronic cooler changeover valve which has come off, or broken. 12, 14 or 15 in the diagram.

317D2F383EBF4367B18DD82141B3B7D9.jpg
 
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.
 
You need to get them to check the vacuum tube (14) to where it connects to the throttle body. I'm sure they know what they are doing though.
 
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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