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Originally Posted by bilsan330
The temp gauge drops to zero when the fan comes on
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That's a pretty good indicator that the sensor signal is lost. This causes the ECU to trip on the emergency cooling - hence the fan roaring when the engine's not in overheat. I suspect the 128C diagnostics reading is part of that response.
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...I then wait 5 mins start the car and every thing is back to normal the gauge always returns to half way.
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I'd suggest that's either a meachanical effect on a weak connection due to the engine vibrations at startup. Or, the sensor itself is failing. Though that's pretty rare, I guess it can happen.
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would you suggest I start by changing this.
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Why not - it won't dent your wallet and may cut a long story short.
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Regarding the water level I always check the water level every morning before i drive...sometimes it needs topping up but I cant see any visible leaks..its had a compression test and new inlet manifold gasket.
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There's definitely a small leak somewhere. Internal or external, they're pretty common in this engine.
EDIT: You'll need to run the Demist Test for low speed fan operation once you get the signal issue fixed. We haven't confirmed that the low speed resistor is OK.
TC