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I bought a Kat's block heater for the Focus. I started looking at the engine to see where it's mounted. Lo and behold there already is one in the block. YAY No cord was attached to it. But the cord that came with the Kat's heater fit it. However, it appears the heater element in the engine doesn't work. I get no heat after plugging it in, and a continuity test shows an open circuit. So now I either remove the one in the block completely and replace it with the Kat's. Or replace the element of the one in the block which appears to be held in place in the fitting with a snap ring and O ring seal. Any opinions on which would be best?