Hi, I am having a new problem with my 2001 DHSE - on a run from the country, yesterday, the engine decided to overheat. I had done a run the previous day of around 100 miles with no problems, and yesterday I had been running around a bit, again with no problems.
When I left for the journey home I got about 20 miles into the journey when I suddely noticed that I had no power, and when I looked down I saw the gauge right up in the red, and the red warning lights was on. I pulled in, opened the bonnet and, even though the gauge was right over in the red the fan wasn't running.
The header tank was filled to the correct level, having been checked the day before. So I sat for an hour to let the engine cool somewhat, but it only drove for about another five miles before the gauge, and the red warning light, came back on.
I did notice that, wth the engine off, but the ignition on that I could hear what sounded like the fan running but it wasn't turning, so I presume that this was the viscous fan unit running but not connecting to the actual fan. I wonder whether this makes sense, is it time to fit a new viscous fan unit ?
I checked this morning, with the car having been left overnight, and cold, and when I started the engine the fan was running as normal at start-up. However, when I tried to stop the fan itself I couldn't. When I checked the fan yesterday, when the engine was hot, there was resistance in turning the fan, but not very much as it turned fairly freely. But this morning it is locked in, and it would probably chop my fingers off if I tried to stop it.
It is strange because my engine temperature always sits at the last blue line on the gauge, and usually only went up to the 12 0'clock position in heavy traffic, and I remember, about three months ago, someone on the forum said the viscous fan could be dodgy, because the temperature gauge should always sit at 12 o'clock. My car has always sat just on the last "cold" sector since I got it nearly tree years ago.
Everything is very clean around the radiator and the hoses, to the extent that they look quite new, but the large finned viscous unit looks a fair bit corroded.
Any advice would be appreciated before I start to order replacement parts, I don't want to splash out £500 on an alloy radiator if the problem turns out to be the thermostat.