how to bleed a radiator

Any tips on how I can reduce the engine noise inside the cab when motoring.

Managed to get the Bongo back on the road, valve and shaft broken inside the fuel injector pump, Gee deisels in Hucknall rebuilt the injector pump and the Bongo is now running better than ever.
Ges

Coming home from work yesterday I was coming down hill towards an Island went round the island when suddenly the revs shot up to 4,500 RPM luckily i managed to pull into a side road and switch off. Checked accelerator cable ok, tubo had not jammed, started engine again but still reving high. AA came ...

Thanks to everyone who gave me advise, Bongo now back on the road, I have fitted new Cam Belt, new seals in the fuel injection pump and managed to fit a new earth lead to the fuel tank, fuel guage now working.

i have replaced the two o rings on the left and right(looking forwards) not those, replace the seal behind the 3 sided bolt and its still leaking . without a pit is difficult to see exactly where the leak is but there are 2 large seals i havent replaced yet one is about 3 inches and the other is the ...