coolant smell in the car

hello people am here again in the forum–lang ists ago… to my problem:have at times cool liquid smell in the carinnern.d.h.with every ride.and that is,I think when thermostat opens starts.not penetrant but it smells.I have determined when speeding up,brakes+curve ride comes such a swell of coolant. during normal cruising actually not….comic.. to exclude some things:have no drops under the car, more often control in the expansion vessel(water tan). d)always equal..no loss noticeable.. carpet front dry.. hm?what could that be? so you saabians, now you’re up;-) many thanks in advance gruss thomas from the ch…….