Overheating

[2463lee]

Hi can anyone help ...Just bought a largo ...drove ok yesterday ..but today started to overheat...no signs of head gask gone

[cemmy074]

is it petrol or diesel/ maybe air lock on your system/not always shows sign from headgasket you wish it was coz it goes head ..need more info about your car to give more info.

[scoobydo]

Seems like you say you have a petrol. First port of call check water levels. I would then block the expansion outlet from the cap under the driver seat. Just get a bit of pipe and screw a bolt in with PTFE on the thread and put a jubilee clip on it. Now on the radiator on the expansion cap there take the tube that goes from the expansion cap to the expansion bottle off and connect bike pump with gauge on it. Now pressurize the system to say 1.2bar via bike pump. The pressure should stay where it is (no leaks) for a couple of days. If you loose pressure you have either a leaky pipe or connector (easily seen if you get some UV dye for your coolant) or a headgasket/ crack in the head or block. You may find water on top of the piston(s) after a period of time this will tell you what cylinder has the issue. You can then position valves open or closed to establish if just a waterway issue on the headgasket or cracked water jacket on inlet or exhaust side.