Hi all,
I apologise for the incredibly stupid question, cars aren't my forte unfortunately so this might be obvious.
I'm looking at getting a Mazda Demio (based in New Zealand), I notice that some engines have this tube (circled in red) which runs over the manifold and towards the firewall, what is this?

Whereas some, of the same make/model/year/transmission(MT), don't?
Thanks in advance
(Picture without drawing on it in case its hard to see http://iforce.co.nz/i/2wfap5jr.gql.jpg)
	
		
			
		
		
	
				
			I apologise for the incredibly stupid question, cars aren't my forte unfortunately so this might be obvious.
I'm looking at getting a Mazda Demio (based in New Zealand), I notice that some engines have this tube (circled in red) which runs over the manifold and towards the firewall, what is this?

Whereas some, of the same make/model/year/transmission(MT), don't?
Thanks in advance
(Picture without drawing on it in case its hard to see http://iforce.co.nz/i/2wfap5jr.gql.jpg)
 
	
 
	 
	 
 
		 
 
		 
 
		