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Originally Posted by Yorkshire GOC
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Excellent advice. Press and hold odometer mileage reset for around 5 seconds until the dash readout says "test-1" then repeatedly press until it reaches 19. Release and let it say "log-1 off". Then hit repeatedly until it says 7. That gives you the true engine temperature.
There's a bit of a knack to it as it will trip back to the odometer if you wait too long (or press too quickly!). Tip - if you use your odometer reading for measuring trip distance or for calculating fuel consumption, either make a note of the reading before going into diagnostic mode in case it trips out, in which case it annoyingly resets mileage to 0, or use the indicator stalk button to measure your mileage.
The dashboard needle is purely ornamental - it reaches 9o'clock at 75oC, starts climbing at 115oC and the red warning comes on when it reaches 12 o clock which is 120oC.
The KV6 is a lovely engine that rarely causes problems, but if you are unlucky enough to have heating and/or coolant issues then it's a bit of a maze trying to figure out the cause (most often leaking pipe, leaking thermostat, air lock, failed fan resistor, and occasionally dropped liner or head gasket, even a faulty coolant filler cap). Persevere, use advice from this forum and if a garage tells you that because it's a Rover it must be head gasket so scrap the car - they are probably wrong so change garage. The KV6 rarely suffers HGF due to the design and materials used, unlike the four cylinder and if a garage can't tell the difference between a 4 cylinder and a V6 then they shouldn't be working on your car.