03-07-2019, 02:01 PM
I'm no expert (far from that my lads) but overheating usually is not as much caused by blocked water passages in the engine block itself but by blocked up radiator passages. So I would first of all drain that system, remove and check the radiator.....maybe have a new cooling / radiator block fitted. Actually I'm quite surprised to read about. your Seven overheating as most people claim they run quite cool.. but perhaps southern -France temperatures are at work here.....
IF you do feel the need to do something to water passages in the block and / or head... I'd try blowing it through with high air pressure first; if you think rinsing with water would work than high pressure air would work as well and there's less risk of that water seeping into your sump.
Furthermore IF the block and / or head really need some decrusting then I'd rather rtake the. whole thing apart and have it properly / professionally cleaned; rinsing with water and probing with lengths of wire may then not really be effective....
IF you do feel the need to do something to water passages in the block and / or head... I'd try blowing it through with high air pressure first; if you think rinsing with water would work than high pressure air would work as well and there's less risk of that water seeping into your sump.
Furthermore IF the block and / or head really need some decrusting then I'd rather rtake the. whole thing apart and have it properly / professionally cleaned; rinsing with water and probing with lengths of wire may then not really be effective....