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Has anyone installed a kats circulating tank heater on a w123 240d? It looks like you need the lower hose adapter. Where do the hoses from the "Y" fitting go? has anyone used a dip stick heater?
The thermostat design doesn't allow circulation when cold. Radiator hose heaters will just overheat itself. You should have a block heater under the intake, if not you can install one there.