PlasticMac
Admin Team
Not sure what's going on. Failed G83 shouldn't cause the engine to overheat. A failed G83 should trigger the fan to run at low speed. If that doesn't get the engine temperature under control, the fan will runs at high speed.Keen to see if it would make any difference I got a new G83 sensor and fitted it. After a shortish drive the temp soared over 90 and the fan didn't seem to kick in.. bit frustrating. Taken a step back. It was at least usable before. If I unplug the replacement sensor would it in theory just put the fan on all the time?
But, (important But), this will only happen if the thermostat is opening, otherwise there is no flow through the radiator. Under light to medium load, the engine will run at around 110C, and the mechanical element of the thermostat will be in control of temperature.
We're guessing, which doesn't work. We don't even know if the engine is actually overheating.
The only accurate measure of engine temperature is via the OBD port. The engine temperature sensor is actually two sensor in one moulding. One sensor feeds the ECU, (and is in control), the other only feeds the dash cluster, which, in turn, drives the gauge.
You need a registered copy of VCDS Lite, and log some temperature data measuring blocks, to see what is really going on. Before, (engine outlet), and after, (radiator outlet), the radiator. Plus engine speed and load.
Are you fitting genuine VAG sensors? Aftermarket sensors can be less than perfect.
Even an engine scan with the free VCDS Lite would help. It will tell you if the G62 or G83 are dodgy
Mac.
Edit: A scan will flag a failed sensor, but not one that's inaccurate.
Mac.
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