My zed is overheating when you flooring hard mainly when you get over 70 mph.....it looses coolant from the bottle as well....

I have reciently flushed the cooling system as there was brown sludge in the water and no antifreeze as the previous owner couldnt be bothered to use it!!!.

Refilled with 40% antifreeze / coolant still overheating......Radiator cap seems to be hissing and letting coolant back into bottle when very hot.....Auxillery fan on all the time after driving down motorway even while stationary.....

Viscous fan locked on also after driving down motorway...

No air bubbles in radiator while cap off and engine idleing.....No while smoke or drops of water coming from tailpipes....No leaking pipes.....

I have only two conclusions 1>faulty radiator cap,2>clogged radiator?????

 

Any other common ideas that these zeds suffer from.....Zed is fine when sat in traffic or driving lightly..... :shock: :shock: :shock:

CHecked heater matrix hoses all fine .....still cant see where leak is coming from although from patch under car looks like rear of engine nearer passenger footwell????

i went trough the same problem/still am. there are a lot of water hoses round the back of the plenum and a bucket load that run through the plenum itself! could be the hose that goes through the turbos so it could be the one on that side.... but let me guess u can't really see where it's coming from by looking down through the engine bay? :confused: i had this too. bybassed all most of the hoses now it's leaking from somewhere else but only when she is up to full running temp and has been driven...

 

still hope that sheds a bit of light on it for u

Check the hoses circled in red ;)

 

what ever hose has gone its leaking through a drain hole in my gear box bell housing so ive started to pull my plenum as it seems strange and i cant see any visible leaks from behind the plenum......

i was just thinking today for one minute i may have popped a core plug?????

Anyone ever popped one????and this is my first plenum removal which i got halfway through untill it rained heavy today.....

Any ;)

I once popped one in an old Sunbeam sports car - at the back of the engine inside the bell housing area. 20p parts and engine out to fit. All because of not enough antifreeze in winter. Obviously you cant have popped one in summer maybe corroded thru tho but that would be highly unlikely. Still more likely its running down the back of the engine from a hose leak somewhere and dripping off the bottom of the bell housing

or maybe previous owner froze it and it popped out only slightly and now ive bought it ,it poped right out under pressure