iceberg phase 2 172
								
							
						
						
	
						
							
	
						
					
					
						
	
					
				
				hi how can you tell if the rear demister is working on a ph2 172 ? mine doesnt have any bulb etc to illuminate to show when its on ..
			
			 
	             
						
					 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		