Hi everyone, I recently had a problem where the radiator leaked a small amount of coolant into the transmission fluid, the transmission began to slip so I immediately took it to a gearbox specialist about 2 miles away who told me about the leak. The garage changed the fluid and I drove away without any problems, the gears shifted perfectly so I took it to a radiator specialist straight away for a new radiator before any more coolant could leak into the transmission. The radiator garage is only ten minutes from my house so it wasn’t a long drive. When I picked up the car from the radiator garage the car was still driving perfectly until it got hot, then the transmission began to slip again and it was unusable until it cooled down. When the transmission gets hot and slips it makes a whining noise and the gear selector cannot be used to select gears manually, it will let you choose R or D but not 1, 2 or 3 etc.

I guess the gearbox is broken now so I need a new one, a friend with a workshop said he will do it if I can get the instructions so can anyone help me out here?

Many Thanks