A colleague at work has a Renault Laguna 2.2 turbo diesel from 1997 which is passing bubbles into the radiator. He assumes it is the start of head gasket failure.
After he has lifted the head and checked the extent of the damage, how much should it cost to skim the head? Does the block ever need attention? Do these heads have a tendency to warp? Is it possible to build up the damaged area so it doesn't need as much skimming off?
Also he asked if anyone has ever tried adding a vent from the top hose to vent the gas pressure so it doesn't depress the water level in the engine?
Bill Derby Bill H Derby