15 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHTemp Gauge Blinking Red Low Coolant Level
Reported or suspected cause
good time
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that suspect a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suspected cause
OP - Probably a good time for you to check your coolant level sensor.
Leading evidence: 'good time' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'good time' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check connectors' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that suspect a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that suspect a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suspected cause
I suspect the wires are broken/cut or the sensor is bad.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Bentley manual has test values if you want to check the connectors.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
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.
15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T220748Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I read in the manual that the blinking red light on temp gauge and warning in the speedo display means low coolant level. I'll check tomorrow when the engine is cool if the coolant level is between the lines. In the meantime is your advice to simply add coolant or should I be looking elsewhere for a fault or problem? /X3
Have you physically checked the coolant level? That would lie my first suggestion. If it is down, add distilled water and pay attention to how much you add, then go hunting for leaks.
manual on the flashing coolant light.
"Four functions of the coolant warning light:
1. Engine coolant level too low -- light flashes slowly (0.5 Hz)
2. Engine compartment temperature too high -- light flashes slowly (0.5 Hz) (engine compartment blower might be faulty)
3. Engine coolant temperature too high -- light is lit; pointer on the right
4. Temperature sensor at water outlet faulty -- light flashes rapidly (1 Hz) ; pointer on the right
Note: The temperature warning in point three is indicated if the conditions "engine coolant temperature too high" and "engine coolant level too low" are present simultaneously."
OP - Probably a good time for you to check your coolant level sensor. On 98-00 model expansion tanks the sensor is underneath. On 01-04 the sensor is back behind tank and above the left wheel arch. Check the temp sensor behind the oil pump on lower right rear of engine. Wire or connector could be damaged. Sensor could be bad, depends on the blink frequency. Both parts are cheap and are easy enough to access. Bentley manual has test values if you want to check the connectors.
thank you, I�ll look into the sensor. I have a 99, should be on the bottom. Can I bypass the sensor to test? I suspect the wires are broken/cut or the sensor is bad.
You can just unplug the low coolant sensor, if the blinking stops. then you have either a bad sensor, or the magnetic float in the reservoir has sank..
So I followed the advice to add distilled water when the engine is cool, then hunt for leaks. Sure enough coolant leaking from in front of expansion tank near the back of the left-rear wheel. The expansion tank, cap and sensor were all replaced at Porsche dealer in 2018, about 8,000 miles ago, so hard to believe it's the tank again. What do you think? /X3
996.1s seem to be notorious for tank failures, but most seem to be aftermarket versions. Maybe try pulling some things away from the tank and confirm where it is...maybe a line, rather than the tanks too.
Just a note: my temp light was slow blinking. Looked in engine bay and found the engine temp gauge sending unit was sitting on block. The gauge is located in the engine bay on the front right side on top of the manifold and should be held in with a rubber gromet. My gromet was missing and the sending unit was sitting loose. Bought a new engine temp gauge and gromet from Pelican Parts for $30+ship.
Worked. No blinking light anymore. Found a tip to look for this issue after endless forum searching. Maybe this will help someone.
