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Old 24-07-16, 02:40 PM   #1
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Default 307 1.4 hdi - Temperarure Gauge and Fan problems

Hi, looking for some advice/guidance. Mt father-in-laws 307 has started to show a temperature fault after having the engine out. When he starts the car it will tick over fine for approx. 5 mins then the fans come on, the temp gauge goes to max and warnings flash on the dash.

He has changed the temp sensor 3 times, changed the thermostat, changed the relay next to the fan and bled the coolant system but this problem still persists. Does anyone have any suggestions. Thanks
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Old 24-07-16, 03:58 PM   #2
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Hi mate, I had a similar problem a few weeks back - engine cold, turn it on, temp gauge goes all the way around, thermo fan runs flat out and the stop light flashes. I was able to fix mine by changing the coolant temp sensor though.

One difference with mine was that the problem started as soon as I started the engine, not after five minutes.

Given that the sensor is sending an electrical signal (a variable amount of resistance), it's fair to say that something could be preventing the correct signal (resistance) from getting from the sensor to the ECU and that could be a problem anywhere along the loom.

You could check that theory by starting the car up, and rather than wait five minutes for everything to get hot, get out a hair dryer and warm up the cable/connectors running from the sensor and see if you can get the error to happen. If you can, it could point to a wiring issue. It could be as simple as a poor connection that expands and looses contact when it gets hot.

The other thing you could do is get someone with a diagnostic tool to be looking at what the sensor is doing when the error occurs. If the actual coolant temperature and the sensor aren't in agreeance, at least it gives you the right direction to keep exploring, rather than changing parts (coolant, thermostats etc) chasing your tail...
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Old 24-07-16, 06:38 PM   #3
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It could be electrical, so it's worth checking the earths are in good order.

Also, it could be a sensor issue - yes, even though it has been changed multiple times - there could be an issue with the wiring supplying the sensor.
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