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Hot!Cooling System Fault on 2015 991 C4 - Advise.

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PJ63
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PJ63 PCGB Member
2016/06/20 10:41:02 (permalink)

Cooling System Fault on 2015 991 C4 - Advise.

Hi Guys
 
Driving back from the Southern Regional Concours event at Avington Park last weekend I had the following message come up: 'Cooling System Fault'. Hence I spoke to Porsche Guildford & they had it relayed in straight away to sort out. That was last Monday & it's now been with them for a week & they seem to have changes loads valves/seals as well as the vacuum pump itself twice & are still getting the error message & are now saying that the Diaphragm in the Airbox is not working which they think is causing all the problem.
The car is less than a year old with only 3000 miles on the clock, so not exactly highly used. Any advise or knowledge on the above would be appreciated.

Current: 991-GT3
Previous: 991-C4GTS, 991-C4, 991-C2, 997-C4S, 997-C2S, 996-C2

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Pieman7
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Re: Cooling System Fault on 2015 991 C4 - Advise. 2016/06/20 11:28:46 (permalink)
Hi there I'd be fuming that they have had it that long and still can't find the problem. Lucky it's still in warrenty hope they given you something super to drive round in. I wouldn't be to pleased they say that the diaphragm might be causing the problem I want to here a bit more of a positive answer seeing how much the car costs. The problem if the computers they plug don't tell them exactly what's wrong there thinking is replace most things till we find it. Good luck feeling the frustration 

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MickHudson
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Re: Cooling System Fault on 2015 991 C4 - Advise. 2016/06/25 22:26:58 (permalink)
I had a similar problem on my 991 'Cooling system fault contact dealer'
 
before I booked it in I had a cursory look under the rear of the car and noticed a small rubber pipe had disconnected from the exhaust valve on the OSR. I popped it back on but still booked the car in. The fault code was reset at the dealer and the tech told me I had resolved the problem !
 
Im sure the OPC will have checked these so can only assume if its the problem I had, is a vacuum issue that can set off the coolant system fault code. All to do with thermo settings on the engine
post edited by Krieghoffman - 2016/06/25 22:27:59
PJ63
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PJ63 PCGB Member
Re: Cooling System Fault on 2015 991 C4 - Advise. 2016/07/05 11:56:28 (permalink)
Sorry as I meant to reply when I got the car back to let you know what the issue was, for anyone else with a similar problem.
 
So after a week of Guildford having the car & having replaced various things that the computer was telling them, the technician then used old fashioned mechanical diagnostic testing to confirm that it was the diaphragm in the airbox was not working & as that is mechanical with no electronic wizardery the computer couldn't find the root cause of the warning message. When I asked why the diaphragm on 2015 3000 mile car would stop working there only reply was maybe a manufacture issue. So a good example of the computer not knowing everything & good old fashioned mechanical expertise might be more useful. Anyway all fixed now & working fine.
 
Just as a sub-note to say that although annoying this is the first problem I've had with any of my 911,s & this is my 5th one I've had from 996's, 997's & a previous 991, so not all doom & gloom.

Current: 991-GT3
Previous: 991-C4GTS, 991-C4, 991-C2, 997-C4S, 997-C2S, 996-C2
carlperrin
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Re: Cooling System Fault on 2015 991 C4 - Advise. 2020/02/02 06:54:57 (permalink)
Hi, I got the message (cooling system fault visit workshop) yesterday on my 981 Boxster.
Where exactly is the pipe you mentioned, can you see it from under the car or do you need to access from above?
any help appreciated.
tscaptain
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tscaptain PCGB Member
Re: Cooling System Fault on 2015 991 C4 - Advise. 2020/02/02 08:07:57 (permalink)
carlperrin
Hi, I got the message (cooling system fault visit workshop) yesterday on my 981 Boxster.
Where exactly is the pipe you mentioned, can you see it from under the car or do you need to access from above?
any help appreciated.


This is a 4 year old thread so you may well not get a response.  I would suggest starting a new one on the Boxster forum.

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AndrewCS
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Re: Cooling System Fault on 2015 991 C4 - Advise. 2020/02/02 08:11:54 (permalink)
carlperrin
Hi, I got the message (cooling system fault visit workshop) yesterday on my 981 Boxster.
Where exactly is the pipe you mentioned, can you see it from under the car or do you need to access from above?
any help appreciated.

 
If it is the vacuum line / pipe / hose to either of the PSE valve actuators ... just look under the car behind each rear wheel.
 
The lines are crimped on to a `nipple` on the actuator ... one of my `nipples` sheared leaving the hose hanging loose ... new actuator fitted under warranty.
 
NB ... the vacuum system operates several items / valves in the cooling system hence other issues may be present (thanks to this forum for highlighting this when I had my issue). 
 

Andrew
981 Cayman S PDK : Focus ST Mk4 : Audi B5 S4 Avant : Mk1 Golf GTI
Aberdeenshire (R2)
Previously - Cayman R Manual


keneccles
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keneccles PCGB Member
Re: Cooling System Fault on 2015 991 C4 - Advise. 2020/04/01 20:30:39 (permalink)
Had a similar problem a while back on my 991 - yellow warning message re coolant system. Porsche dealer took it in under warranty and confirmed that one of the vacuum driven change over valves was not operating, so they swapped it out telling me it is a fairly common fault. They also replaced another change over valve a few weeks later when I got another yellow warning telling me that the 4WD drive system had shut down - again they said they had come across this before. Oh and they also swapped out nylon bushings on the brake pedal - car is manual - on hot days, this was causing the pedal to stay partially depressed. Apparently this was also a well known fault though no recalls?
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