how to test fuel burning heater working?
I have found an 'exhaust' pipe in front of the passenger side front wheel, suggesting I have a fbh on my 2004 td4. Recent weather starting temperatures have been 3-4 below zero, however i have seen no sign of the fbh working( blower on 1st or 2nd setting, temperature setting on hot.....said exhaust pipe cold at the beginning and end of a run). I have checked the fuses as stated in user manual and all okay. I am aware of the air sensor being restrictive between 0-5 degrees, however at minus 4 I thought it would have cut in?? Is there an easy way to check the thing works without taking the front bumper section off????
My heated windscreen element has given up so a working fbh would 'help' speed up the inner defrosting.