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sticking coolant sensor mate is my guess. Do the pedal test to see if any codes are being stored.
 

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ill have to look at my hayne to confirm the location as im brill on the 16v (can tell you where every nut bolt wire goes etc) but limited experience on the 8v. you probably know more than I do about your engine so if where you have indicated is the sensor, try cleaning it up (coolant crust) or replacing it. What does your engine temp gauge do on the dash is it reading true? it should climb to around 90 and hold there. but the fact your getting a warning light does suggest sensor. also check for bad or frayed wiring to and from the sensor.

let us know how you get on as the info may help others in future.
 

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Lol. Ok well your sensor is on the top left corner at the front just follow the big coolant pipe up to the thermostat and you'll see it poking out the side with the wire running under your rocker cover along the side of the cam cover and back to the loom.
 

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You are right the coolant sensor is stuck on the side of the thermostat but it is removable from the unit.
 
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