Several of you had commented that the water filter was not an original part of the 1959 Imperial, and I wonder if it wasn't, why would anyone install such a thing, which I've never heard of on any car! The one on my car is mounted on the front support bulkhead just to the left of the radiator when facing the car. It certainly appears to be an original part, since it's aging corresponds with the rest of the engine. The filter is appears exactly like an oil filter hanging off the bottom, but says water filter on it. The device has a two hoses, an intake and out take, and is hooked up. As for my cooling problems, they have completely vanished since adding the overflow canister, and replacing the lower radiator hose. The car now runs at a cool 160 degrees on the freeway, climbing to 190 on surface streets in stop and go traffic. With the addition of the canister, and Felipe's clear hose tranny fluid return the streets under my Imperial are now high and dry, and I don't have to add tranny fluid all the time since it goes up the hose then back into the transmission. I'm sure my one neighbor is also happy, even though my Imperial often occupies her favorite parking spot! Bill '59 Crown