I couple of things to check are, don't fill it too full. It should an inch or so from the top of the neck. If you keep filling it to the top, it will keep overflowing. Make sure the radiator cap is good & of the correct lbs. A non A/C car should have an 8lb cap & an A/C car should have a 14lb cap. John Imperial59crown@xxxxxxx wrote: > I was wondering if anyone had tried to put a coolant > overflow canister on an older Imperial. Today was a pretty > hot day here in So. Cal., and I drove my '59 to work. I > had a few associates tell me my car was leaking coolant, > but I told them the older cars just have a tube running to > the street, which is why you had to check the water every > time you gassed up. Today I had quite a bit boiling out in > a river through the parking lot, since I just topped off > the radiator the last time I drove it. After seeing how > much went out, I will have to check it for coolant before > I drive to work tomorrow, and when we get some of the > really hot 100 degree days in summer, I'm afraid I will > have to carry around a jug of coolant in the trunk. It > would be easy to put in an overflow canister, and there is > plenty of room. I was just wondering if it would work? > Bill '59 Crown