Let my bro drive my car yesterday adn he drained the whole tank. When I got it back, I was cold so I hit the heater and a fine mist of coolant blasted me in the face. Then I noticed the low coolant light on, and felt something damp under my bare feet. The carpet and mats on both the drive side and passenger side were soaked in coolant. Took it into Carlsbd Volvo and it seems they have th replace the heater core. Luckily I still have a month of warranty left till I have to think about extending it. Anybody else here had this heater core problem? Sux to be away from the C70 for two days.