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Installed a new blower motor and when I went to install the housing, there is this gap between the housing and the heater core, all the bolts line up correctly but when I turn the ac on, the air goes through the gap and not to the vents. Previous owner tried to cover this split by using tape and I know this is the pipe for coolant to go to the heater core. By how would I go about replacing this? What is this part called?