duovalve

Hi all, My duo valve has failed, it only blows hot. The umbrella things have broken and one is lost. I believe that the source of the problem though don't know for sure. I am taking the car abroad in a couple of days (yes I know it was silly to leave it until until now but I've been too...

Greetings. My Mercedes has a heater that is only giving out very 'tepid' heat. My mechanic has been looking at the problem. He has checked the thermostat - that is fine. He has checked the DuoValves (knackered and to be replaced - is it worth getting one from a breakers ? ) He states they...