citreon ds4 heater not working
i have a 13 plate citreon ds4 2ltr hdi sport and recently the cabin heater has stopped working. I have read on a number forums that this is a common fault with citreon cars. When selecting the dual climate control and changing the temp the car is blowing cold air rather than hot air. Once the car is up to temp the engine heat kicks in and temp starts to rise. As the blowers are working the fan is working just not blowing hot air immediately. I have been advised that it could be the heater matrix that is knackerd but wanted to see if there were alternatives. I was also looking for hayes manual but cant seem to find one on the market please help.