1996 Mercury Cougar Owner's Manual - Page 246

3.8L engine only u Open the vent plug. u Remove coolant recovery reservoir cap. u Remove radiator pressure cap. u With the engine off and cool, add a 50/50 mixture of recommended cooling system fluid and water to the radiator until full, then add to the reservoir until the reservoir is at the FULL-HOT level. u Close the vent plug. u Reinstall the coolant recovery reservoir cap by installing the cap to the fully installed position. u Reinstall the pressure cap to the pressure relief position by installing the cap to the fully installed position, and then backing off to the first stop. hose is warm (this indicates the thermostat is open and coolant is flowing through the entire system). completely with a thick cloth and cautiously remove radiator pressure cap and add a 50/50 mixture of recommended coolant and water until system is full. u Start and idle engine until the radiator upper u Immediately shut off engine. Cover cap u Reinstall the radiator cap securely. u Remove the cap from the engine coolant recovery reservoir and add a 50/50 mixture of recommended cooling system fluid and water to the FULL-HOT mark on the engine coolant recovery reservoir. Check that reservoir hose is not kinked. u Reinstall the reservoir cap. 249