In a message dated 6/29/2002 5:15:19 PM Pacific Daylight Time, PogoBluesMouth@xxxxxxx writes: << The coolant recovery tank on my 74 440 takes in fluid but doesn't return it to the radiator, what could be the problem? >> You Probably have the wrong radiator cap. In order for a recovery tank to work, the cap must seal in both the bottom of the neck, like all radiator caps and also at the top edge of the neck above the recovery tube. This is so that the vacuum created once the engine cools down after it is shut off, can suck the excess coolent back into the system. Roy 67 Crown FDHT