So I notice the other day the heat was just warm coming out the vents. So I figured I’d clean the duo valve and flush the heater core. On my quick inspection, I could not see were the hoses enter the fire wall. Plan to take a deeper look this weekend. Any advice would be appreciated!

look near the control box - there is a molded hose that clips into the false bulkhead and then into the valve, (right by the expansion tank)

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

On the passenger side the 2 hoses from the duo-valve connect to the heater core pipes underneath the water collector. It needs to be removed for access to the clamps - or remove the duo-valves and flush from the driver's side.

Recently had remarkable results with CRC Thermo Cure flush and it is supposed to be non-toxic.

Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer