l found some oil-like substance on the driver side floor. l checked the brake fluid. It is OK. l think it might be coolant because l poured some coolant twice in one year as my onboard computer ''advised me'' and now its low again. So what might that be and does anyone have a clue how much it will cost me to fix it. Thank you very much...

If its leaking inside its probably the heater matrix, it will be expensive and quite a big job. What l did with my girlfriends Volvo that had the same problem was to put a tin of Holts Radweld in the radiator and it cured it, that was over a year ago and its been fine.

sounds like the heater matrix has gone dude you need to take it to the garage and get a new one especially if your heaters are like all cold. you want to get it priced at a local garage as it may cost a hefty bit depending on how much of a job it is on that car l know on a pug 106 its hell of a job and l wouldnt entertain it for less tha 250 buks, hope this helps :)

If you've got the stomach for it,taste it,coolant is sweet,like two sugars sweet,hydraulic oil tastes like something you never want to taste again