Hi would appreciate any advice anyone can offer please. My voyager has been losing coolant for about 6 weeks now and recently every time i use it the levels gone right down. The garage have said theres no visible leaks but that i have oil in my coolant tank and apparently i need a new oil cooler. They still cant explain why im losing so much coolant and i dont want to shell out money if its not going to fix the problem i took it in for in first place. Im a tad sceptical of the garage as my problems only started after they capped off my pre heater pipe which was leaking (though that was on left side when facing car) it was after this that i noticed all the rust coloured gunk in my coolant tank which at time they said was nothing now they are saying its oil! Any ideas?