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Tech Article

E34 5-Series Front Coolant Hoses

Last Updated: 11/21/2016
This article discusses the front coolant hoses for the E34 with the M20 engine. The main focus is on explaining the high-level location of the hoses, to help with reassembly. The information herein is based on an engine I worked on.



The above pictures shows the front of the engine after the three large large coolant hoses have been removed.



A metal pipe carries coolant across the front of the engine. At the top of the pipe, a short, wide L-shaped coolant hose runs to the driver-facing metal outlet on the outer thermostat housing (D in the accompanying picture). The L-shaped coolant hose has its sharpest bend and shortest leg nearest to the thermostat housing.

At the lower end of the pipe is the lower radiator hose.



A U-shaped coolant hose curves behind the distributor cap and high-tension leads. At the driver side, the hose carries coolant to the forward-facing metal outlet on the thermostat housing (C in the accompanying picture). At the passenger side, the hose guides coolant from the top of the water pump (A in the accompanying picture).



The water pump has only one outlet, and takes in water from behind, where it attaches to the engine.

A long L--shaped coolant hose guides coolant into (or out of, I don't know) the top of the metal outlet on the inner thermostat housing (B in the accompanying picture).
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