I have a problem with my 53 reg Vauxhall Vectra petrol. My heater has stopped blowing warm air into the cabin. I have had my thermostat replaced and still no warm air in the cabin. Also my temp gauge ...

Have you checked the coolant level? When you say it has stopped, is that the fan motor (is it blowing cold air)? Check the heater pipes/hoses going into the bulkhead (to the heater matrix). See if ...