Greetings,<p>I am the owner of a 1999 Volvo S70 and have recently been having problems with the coolant light coming on. I have checked the coolant reservoir many times and it is properly filled. <p>About four months ago I had my car's AC compressor replaced at the dealer. I never had trouble with the coolant light coming on until this repair was performed. Also, the coolant light does not stay lit constantly. It seems to light up when I am driving over bumpy side roads around town. Could this be a loose sensor?<p>Just looking for some initial feedback before I take the car back to the dealer. Hopefully this isn't something serious or costly!