Save your money trying to fix your van, I'ts a Renault, which anyone knows, are rubbish. Just type in Renault in the search box and you will see what I mean. £730 is just the start, if that doesn't work you will fork out more and more cash trying to fix it, until you've spent enough money to have replaced it. Just take it to the scrappy and put the money towards a decent van.
DB, July 2011