Drop by a good parts store and get a bottle of antifreeze compatible UV dye; add to a cold cooling system at the tank on the firewall; before starting the engine rinse with clean water (no heavy spray - rain show like so you don't force water into fittings); drive for say 100 miles; park in shade or ideally garage; look for leak with UV light (can get a UV light cheap from Amazon). Pay careful attention to the vicinity of a) EGR valve and cooler (driver side rear of block on US vehicle), b) oil cooler (opposite side in front of turbo), c) radiator fins, d) heater core (check drip tube from heater core which should exit firewall a bit below coolant tank), e) all the other usual spots. Might want to put on new radiator/coolant tank cap as sometimes a bad cap can cause excess overflow the seems like coolant loss.
FYI coolant smell in the engine bay suggests coolant dripping on hot surface. Losing 2-3 cups of coolant per tank (say 500 miles) is a pretty slow leak which if it drips on a warm surface will evaporate with no steam and no drips. I lost that much on a early model Plymouth Voyager due to a weak spring clamp on the lower radiator hose which produced an almost invisible leak that we never would have found but for dye
_________________ Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs
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