Hi, I had this one in my C5, in my case the PWM fan transistor was dead. When I opened the plastic cover of the PWM module I saw the transistor didn't touch the radiator anymore. It just fried. I could turn it on and after a couple of seconds the fan controls would stop reacting and the fan lcd would go off, sometimes leaving the fan fully on, sometimes fully off. So the transistor was still trying to work when it was cold. I replaced the transistor and used some thermo glue and It's been fine for 2 yrs now.pabloalfa76 wrote:The Heater fan has packed up! made for a scary drive to work with a frozen-up screen. ( I had a dry soldered joint on the resister pack about a year ago, I re-soldered it and it's been fine since ) I'll do some testing over the weekend.
Ps, Have a nice weekend.
I hope your starting problems are fixed for good.