Elena, those heater control valves are a regular fault, you've probably already been told this trick but the first thing is to give them a tap as they often stick and a few taps with a spanner will often free them without actually removing or undoing anything.
Hi Ken and PCT
Thanks I like the sound of cheap fixes, I will let you know if it's a success. But just to make sure I am hitting the right bit the valves are two silver cylinders close to each other and there isn't anything else that looks like them under the bonnet?
Kind regards
Elena
Last edited by ElenaB; Oct 16, 2013 at 12:38 AM.