2006 Saab 9-3 Owner's Manual - Page 223

Car care 223 Coolant expansion tank, 4-cyl engine 4-cyl engine: The expansion tank is transparent to facilitate checking the coolant level. When the engine is cold, the coolant must not lie above the KALT/COLD mark on the expansion tank (boundary between the upper and lower sections of the tank, see illustration). Top up with a mixture of equal parts of antifreeze and clean water. We recommend that you use a Saab-approved anti-freeze. If the expansion tank is empty when coolant is added, run the engine until warm so that the thermostat opens. Top up the tank again, as necessary. Coolant expansion tank, V6 engine Level markings, V6 engine 1 MAX 2 MIN V6 engine: The expansion tank is not transparent. The cap must be unscrewed so that the coolant level can be checked. When the cap is screwed off there are two level markings, MIN and MAX