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davidjf7
Imola


Joined: 21 Oct 2010
Posts: 756
Location: Hertfordshire


PostPosted: Tue Oct 23, 2018 8:23 am    Post subject: Water temp Reply with quote

Hi all,

On my 997.2 my water temp gauge has always been straight up as soon as it's warm (80 degrees).

Last couple of days I've noticed it's been dropping lower (and then recovering again).

Does that mean I have a thermostat issue?

Thanks
 
  
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The return of Marty Wild
Suzuka


Joined: 04 Nov 2016
Posts: 1088



PostPosted: Tue Oct 23, 2018 12:31 pm    Post subject: Reply with quote

Demort will be along this evening after he has finished work.

The guage isn’t accurate, just gives you an indication that you’re in the desired range. So weird if it is dropping off.
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5341
Location: Brighton


PostPosted: Tue Oct 23, 2018 6:32 pm    Post subject: Reply with quote

Are we talking a big drop or a small one ?

Once driveing does it tend to stay at 80 degrees ?

There may well be no fault as its colder now but it could be electrical as well .. with out an eml on then i think for now just keep an eye on it as the car will trigger this if it thinks there is a problem.

Other than that you are left with a fault code read out and perhaps a look at the actual temps with the tester and not the gauge ... so probably a garage job.

There are no set problems i can think of for this fault .. thermo faults tend to be a big cool off and a struggle to reach temp as they fail open.

The same for a box heat exchanger fault .. which ive not sen on a PDK .. only a Tip .


I think for now i would just keep an eye on it .
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davidjf7
Imola


Joined: 21 Oct 2010
Posts: 756
Location: Hertfordshire


PostPosted: Thu Oct 25, 2018 8:40 am    Post subject: Reply with quote

deMort wrote:
Are we talking a big drop or a small one ?

Once driveing does it tend to stay at 80 degrees ?

There may well be no fault as its colder now but it could be electrical as well .. with out an eml on then i think for now just keep an eye on it as the car will trigger this if it thinks there is a problem.

Other than that you are left with a fault code read out and perhaps a look at the actual temps with the tester and not the gauge ... so probably a garage job.

There are no set problems i can think of for this fault .. thermo faults tend to be a big cool off and a struggle to reach temp as they fail open.

The same for a box heat exchanger fault .. which ive not sen on a PDK .. only a Tip .


I think for now i would just keep an eye on it .


Thanks demort Thumb

Driving round the m25 yesterday. 14 degrees outside, 70mph or so. Was dropping off to as low as 65 degrees and then recovering again to 80. Oil temp seems ok.

Seems weird as it's never done this before Question
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5341
Location: Brighton


PostPosted: Thu Oct 25, 2018 6:49 pm    Post subject: Reply with quote

Ok thats not right ..

the closest ive seen is on a gen 1 Tip , an electric valve fails and allows coolant to cool the heat exchanger when it shouldnt .. temp is around 65 degrees so very similar.

PDK and im pretty sure there is a similar heat exchanger .

You dont say if its a PDK or a manual so im guessing at a PDK.

Sooo you need to get it looked at just in case ..

Only thing i think you can check is just make sure both fans are working .. if one jams the other runs flat out to compensate ( over cooling ) .. pretty easy as you just start it up and listen .. one will be very loud .. or just put a/c on and your hand in front of each side to confirm.
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davidjf7
Imola


Joined: 21 Oct 2010
Posts: 756
Location: Hertfordshire


PostPosted: Fri Oct 26, 2018 8:30 am    Post subject: Reply with quote

deMort wrote:
Ok thats not right ..

the closest ive seen is on a gen 1 Tip , an electric valve fails and allows coolant to cool the heat exchanger when it shouldnt .. temp is around 65 degrees so very similar.

PDK and im pretty sure there is a similar heat exchanger .

You dont say if its a PDK or a manual so im guessing at a PDK.

Sooo you need to get it looked at just in case ..

Only thing i think you can check is just make sure both fans are working .. if one jams the other runs flat out to compensate ( over cooling ) .. pretty easy as you just start it up and listen .. one will be very loud .. or just put a/c on and your hand in front of each side to confirm.


Yep, PDK.

Had a fan jam before when a bit of 'surface dressing' got stuck in one of the fans. Haven't noticed that noise again, so don't think it's that, but will check.

Thanks again for your advice deMort - will get it checked out
 
  
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davidjf7
Imola


Joined: 21 Oct 2010
Posts: 756
Location: Hertfordshire


PostPosted: Fri Oct 26, 2018 3:04 pm    Post subject: Reply with quote

So OPC says it sounds like a thermostat issue and want £170 + VAT to do a diagnostic test...
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5341
Location: Brighton


PostPosted: Fri Oct 26, 2018 4:10 pm    Post subject: Reply with quote

If the car is under warrenty then you have little choice .. if not then perhaps a local indy.

Usual base diagnostic check is 1 hours labour .

Whilst a thermostate is a possible cause im not totally convinced its that ,, the symptoms seem a bit off but at the end of the day im just guessing .

Either way its a bit of a large drop off in temp as 65 degrees is pretty low and shoulnt be able to happen on a fault free car .
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