when my engine is left to go cold like over night or for an hour or so, when i next start it i get a squeaking noise sounds like the fan belt but i thought if it was loose it would do it all the time. if i leave the engine run or drive for a few mins it stops. also it doesnt do it if i rev the engine. only when its left to tick over
	
		
			
		
		
	
				
			
				
		
 