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if you are losing that much coolant i'd suspect (1) a leak in in your freshwater antifreeze coolant lines, pinhole leak or crack ? (2) a leaky seal in your freshwater a/f coolant pump (look for d rips under the pup by fitting a cloth 'diaper' under the pump or (3) a leak where your engine a/f hoses circulate thru a hot water heater . common for those hw htr hoses to chafe or abrade on a bulkhead and blow coolant into the engine compartment or h w htr compartment , which leaks can be a devil to find.
get ahold of a stant pressure tester , you'll need a cap to fit the volvo radiator cap- take the cap with you and see if your local autoparts store will rent you a stant. then you can pressurize your a/f system using the stant installed in the radiator cap, pressure the stant to about 7 psi and you should see a stream of a/f shooting out some where. then you have to fix it... if you dont find this coolant leak you run the risk of an engine overheat and that wont be pretty.
let us know what you find. if you're anywhere near erie pa i'll lend you my stant.