Join Date: Mar 2008
Location: Staffordshire Moorlands
Car: MG TF 135 Cool Blue (silver), 3 MGBGT's, Land Rover Defender 90
There have aso been several people over the years with similar hard to find leaks that have eventually found it to be a hose with a split that only leaks under pressure. Have you tried running the car until it is up to temperature and pressure and then having a close look at the hoses and pipes? Usually these slower leaks leave whitish marks on the side of the engine, as the coolant evaporates where it runs down the engine, leaving a residue. Don't forget that these small amounts of coolant may not run straight down the engine, but may result in the drip to the floor being some way from the leak. Look for damp or discoloured areas on the engine and if nothing is obvious think about putting dye in the coolant that shows up under UV light. UV torches are cheap on ebay.