ZD30 Using coolant

[trb012]

Hey guys Ive noticed over the last 20,000km or so my nav is loosing approx half a liter of coolant between services? Still runs perfect and have pressure tested system without any signs of a leak could it be the start of a dreaded cracked head? It's an 05 with 210,000km on the clock.

 

[tweak'e]

any bubbles into the reservoir ?
check for any minor leaks, often they dry up really fast so can be hard to find.

 

[trb012]

No bubbles and cant find any leaks there's some light staining around the bottom of the return hose into overflow so maybe its slightly leaking from there? Will replace hose and radiator cap for good measure then go from there.

 

[trb012]

Still not sure where my missing coolant is going have replaced rad hoses and cap still doing the same thing. Starting to think the head has a slight crack or the gasket is leaking still drives fine and has never over heated.

 

[Rumpig]

Coolant also goes to the egr valve, check the plumbing to that and the valve itself.