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engine temp going up when headlights on


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Hi. I hope someone can help- ive got a

200tdi 90. It goes great apart from when

I put the headlights on. When the headlights are on the temp. Gauge goes up ro red. When the lights are put off the gauge goes back to normal. (Straight up) ive

also noticed when the headlights are on the wipers slow right down.any help would be apreciated. Cheers.

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I agree with Mo, it's most likely an earthing issue. Pay particular attention to the instrument earthing wires - they're often secured to the instrument clamp bracket, which in my experience can come loose over time.

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I bought a 110 once and driving it home I was concerned that the temperature gauge was reading a bit high, even pulled over a few times to let it "cool down" to no avail. Then sitting at a junction indicating I realised that the gauge was bouncing in time with the indicators! I could alter the temperature by adding or removing various electrical loads - lights, heater etc.

I looked underneath when I got home and there was a small-ish lead from the battery negative hanging down near the sump with a ring terminal on it, and one of the sump bolts had a witness mark around it so I put it on there and from then on no problems. Never seen such a lead on any other Land Rover but it did the job here, I can only presume that there had been a problem with the main earth strap at some point and a previous owner had put this earth lead on as a fix, and then forgotten to re-attach it after having the sump off for some reason.

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