now a diesel head..
AO Silver Member
Join Date: Sep 2014
Location: United Kingdom
more info please..
why did you have a sniff test in the first place...? what were the original symptoms that led to a head gasket diagnosis and really importantly did you get to the bottom of why it happened?
who did the headgasket..?
was it skimmed as well, I'm asking because a coolant leak straight after a head gasket replacment is not a good sign, especially as it overheated as well...overheats are what generally cause a head gasket failure
best case scenario is the system was not bled properly and still had air in it, physics 101, air expands at temperature and water does not.
if there was still air in the system then it wouldn't be sufficiently pressurised to reach operating temperature without leaking somwhere.
this is because the boiling point of water is higher when pressurised..roughly one degree per PSI.
worst case scenario is the head repair has not been done properly, with an ali head and cast iron block you MUST SKIM!..the head is most likely warped and will not seal against the block causing combustion gases to get into the coolant system which then leads to leaks, blown hoses and even expansion tanks and radiators.
it could also be a failing water pump or a faulty thermostat, although they are more likely to fail open than closed , the only thing you would notice then is the car would take much longer to get to operating temp.
hope for best, and give the system a flush to clean out all the crap and refill with a mix of coolant and water..50/50 is sufficient for the UK and its the pink stuff.
thoroughly bleed the system it helps to have the car on an incline as air will go to the highest point.
p.s worst worst case scenario is the head has a crack in it...but don't even begin to think about this until you have refilled the coolant and run the car.
I really hope it was just an improperly bled system or a pump or stat, these are cheap parts to replace and easy to DIY..
Last edited by joeymannero; 20-12-14 at 07:28.