Owned my current 2001 S60 T5 since late last year, but the last month or so have noticed a damp passenger foot well carpet. The fluid is pink and slightly greasy feeling so I'm guessing engine coolant? Haven't had to top the expansion bottle up which I thought was a bit odd. No fogging up and the climate control still works fine with plenty of heat. Not done much mileage the last few weeks so haven't stuck my head under the dash for a look but I'm guessing it's most likely the heater matrix? If so how scary of a job is thing to change and anyone got any tips?

Thanks guys
Dave