|| Hello everyone, || || I would like to submit the following problem : I have a Discovery || series 2 with a minor (?) problem. After driving for 30 min, a red || warning light appears on the dashboard. It's the light for the oil || temperature of the (automatic) gearbox. Strangely enough the light || goes off when I drive on the highway. The car was checked in the || garage but the computer checkup didn't reveal anything wrong. The || car drives fine, no specific noise, no oil stains on the garage || floor, no nothing. The mechanics think it's a wiring problem, || nothing to worry about. But I do worry : why does the light go off || when on the highway ? Due to better ventilation, or because the || gearbox doesn't have to change gears often ? || || thanks for any input. || || Pierre || Belgium
Do you mean that the light comes on when driving off-road, but goes out when you return to normal road driving? The autobox will be working harder off-road, so that would explain the difference in temperature. However, your Disco should be easily capable of driving off-road without cooking the autobox. I doubt if it's a wiring fault, unless the light flashes, when it could be a faulty connection. If the light stays on all the time, a wiring fault is unlikely.
Which leaves the question, why is it overheating? I would check the transmission oil cooler first. If this was blocked with mud, it could give the symptoms you describe. I had the same problem on a Disco 1 - got the oil cooler caked in mud, and overheated the autobox when towing a caravan on the way home, which had never happened before. The oil cooler is located below and in front of the radiator. I would check this first.