Temp light flashes when I use the horn...?!

[Poddington]

Not really a problem this (I hope) just wondering what's going on with the beast...

When I press the horn, the temp/coolant level light on the dash flashes - what could be causing this?

The horn recently stopped working and then started working again, without me doing anything (the only thing I can think off was a particularly rutted car park I drove over might have jolted a connection), might this have anything to do with it?

[syncrosimon]

I think that the near short circuit and high load of the horn can effect the resistance based senders and wiring in the dash pod. I had the same thing happen when the battery + terminal was shorting intermittently on the battery box lid. Nothing to worry about.

Simon

[Mocki]

common syptom of a poor earth, most likely at battery earth strap or engine bay near electronics junction box, esp shows up on derv engined vans

[Poddington]

Cheers for that. Though it might have been something to do with the earth because the water pump buzzes for a few seconds when I switch the stereo on so there's clearly something not quite right!