Engine Coolant Hose, Genuine BMW - E21 320i (1980-1983)

This part is listed by BMW as BMW part number 11531266453 (11 53 1 266 453) and is described as Engine Water for 1980, 1981, 1982 and 1983 model year E21 320i. This coolant hose runs from the thermostat to what's known as the "Switch housing", which is the coolant manifold / housing that the temp sensors thread and mount into. 

Only for the 1980 and later 4 cylinder 320i. (Not for Euro 6 cylinders or cars before the 1980 model year). 

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BMW Fitments:

3 Series
E21 (75-83) > 320i