997.2 GT3 Temp failure indicator
Discussion
I wonder if anyone here can help
997.2 GT3 today on a “planned” long trip out, got 3 miles or so, and Temp gauge went to 0 with red light on in top right corner. Temp failure indicator warning appeared. Stopped the car, re started still there, drove back home.
Had a good look around, no leaks, water level normal, water pipes in engine bay not too hot to touch nothing obvious untoward.
Plugged in OBD, quite a few fault codes, some not relevant to the GT3, makes me think battery not in great shape? albeit it starts no problem.
Cleared fault on temp sensor, re started car, gauge working, light out.
Set off again, this time got around 10 miles, noticed that at speed water temp dropped below 60 and oil temp around 50, where they normally sit around 80 and 90 all day long summer or winter. Same thing happened temp gauge to zero light on etc, so turn around slow drive home also noticing no warm air out of heater when set at 22, outside temp was 8. Car feels fine, engine runs perfect.
Another check over engine not hot, no signs of leaks, water level full etc. Cleared fault again, started up and left ticking over. After a while water temp up to 80, oil 60/70 fans working on/off, and turning the heater up warm air fills the cabin.
Went for a 10-mile drive 8 on a dual carriageway so up to speed, Car performs as expected. After a mile, at speed water temp dropped to just below 70, oil around 60/70, temps varied a little due to speed etc, but no warning light temp gauge to 0 etc
As mentioned, the temps are normally VERY consistent, so I am a bit perplexed. Could it be a sticky thermostat? I have my battery on a C-tek now as after the run it was only on 3 lights, 40 mins later its on 4. Could the battery be on its way out? Could that cause these weird symptoms?
Thanks in advance.
997.2 GT3 today on a “planned” long trip out, got 3 miles or so, and Temp gauge went to 0 with red light on in top right corner. Temp failure indicator warning appeared. Stopped the car, re started still there, drove back home.
Had a good look around, no leaks, water level normal, water pipes in engine bay not too hot to touch nothing obvious untoward.
Plugged in OBD, quite a few fault codes, some not relevant to the GT3, makes me think battery not in great shape? albeit it starts no problem.
Cleared fault on temp sensor, re started car, gauge working, light out.
Set off again, this time got around 10 miles, noticed that at speed water temp dropped below 60 and oil temp around 50, where they normally sit around 80 and 90 all day long summer or winter. Same thing happened temp gauge to zero light on etc, so turn around slow drive home also noticing no warm air out of heater when set at 22, outside temp was 8. Car feels fine, engine runs perfect.
Another check over engine not hot, no signs of leaks, water level full etc. Cleared fault again, started up and left ticking over. After a while water temp up to 80, oil 60/70 fans working on/off, and turning the heater up warm air fills the cabin.
Went for a 10-mile drive 8 on a dual carriageway so up to speed, Car performs as expected. After a mile, at speed water temp dropped to just below 70, oil around 60/70, temps varied a little due to speed etc, but no warning light temp gauge to 0 etc
As mentioned, the temps are normally VERY consistent, so I am a bit perplexed. Could it be a sticky thermostat? I have my battery on a C-tek now as after the run it was only on 3 lights, 40 mins later its on 4. Could the battery be on its way out? Could that cause these weird symptoms?
Thanks in advance.
Odd. It could be the battery - how old is it?
My C4S has just thrown a cooling fault - it's likely to be the changeover valve, although it could be a number of things.
Have you checked your coolant level (when the car's cold of course)?
Slightly flakey batteries play havoc with warnings - but who knows?
My C4S has just thrown a cooling fault - it's likely to be the changeover valve, although it could be a number of things.
Have you checked your coolant level (when the car's cold of course)?
Slightly flakey batteries play havoc with warnings - but who knows?
Not sure how old the battery is, just started it, starter after a hour or so on the C-tek deffo spun over quicker, battery read 14.7 when running so alternator good. 12.7 just after turning off. Back on charge now.
Up to 80 water, and 70 oil after 10 mins, all seems normal but not been out again.
I have a Temp sensor coming as wiser people than me suggest try that first, fingers crossed!
Up to 80 water, and 70 oil after 10 mins, all seems normal but not been out again.
I have a Temp sensor coming as wiser people than me suggest try that first, fingers crossed!
Google Change over valve Rennlist
This is a common issue with the 997. The change over valve for the gearbox cooling circuit remains open. With air flow and cool weather the coolant doesn't get to operating temperature and starts dropping in temp, resulting in the rudimentary ECU throwing a coolant sensor fault. Its not the thermostat, its the change over valve, and its a rather inexpensive part.
This is a common issue with the 997. The change over valve for the gearbox cooling circuit remains open. With air flow and cool weather the coolant doesn't get to operating temperature and starts dropping in temp, resulting in the rudimentary ECU throwing a coolant sensor fault. Its not the thermostat, its the change over valve, and its a rather inexpensive part.
LiquidRS said:
Google Change over valve Rennlist
This is a common issue with the 997. The change over valve for the gearbox cooling circuit remains open. With air flow and cool weather the coolant doesn't get to operating temperature and starts dropping in temp, resulting in the rudimentary ECU throwing a coolant sensor fault. Its not the thermostat, its the change over valve, and its a rather inexpensive part.
Thank you This is a common issue with the 997. The change over valve for the gearbox cooling circuit remains open. With air flow and cool weather the coolant doesn't get to operating temperature and starts dropping in temp, resulting in the rudimentary ECU throwing a coolant sensor fault. Its not the thermostat, its the change over valve, and its a rather inexpensive part.
Checked the 3 valves left side of engine bay near the header tank they all open close let air through and not etc, so they appear all good. Am i correct in thinking there is another next to the Gearbox??
LiquidRS said:
Yes, there s a valve in the vicinity of the gearbox oil cooler
Found it Removed, tested, not working!!! [ no clicking ]. Ordered another, but have fitted a good one from the engine bay onto the gearbox to save some time and get the car off my scissor lift.Hopefully that will sort the issue, i suspect i will owe you a beer or 3
LiquidRS said:
Happy to hear that it s resolved. Went through this ordeal many years ago when the dealer just threw the parts canon at the problem until I decided to do my own diagnosing. Would happily have that beer if I was in the UK?
New valve fitted, car behaving perfectly again Cant thank you enough.cheers
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