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Old 10-05-2012, 10:53 AM   #84
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Join Date: Aug 2012
Location: Gulfport, MS
Posts: 510
My Ride: 2002 325i
Originally Posted by WDE46 View Post
The hose on our BMW may just be more stiff than other cars too. Also, I have no doubt that the output side of the pump (that hose) will be at a higher pressure than the rest of the system. This is where a flow sim would help, but I don't have enough data. Tapping a place for a pressure sensor/gauge is hard, because you will likely weaken the connection. You could cause a part to crack open.
No, the hose itself is not stiffer. It is the same resistance to squeezing when the engine is cold, as the hoses on my other cars when they are cold.
No, it is not due to the flow from the water pump, because I am squeezing after shutting the engine down, not while it is running.

I don't present this test as proof of pressure, just as reasonable doubt to it not being higher pressure. If you want proof, install a pressure gauge. If this discussion is not about actually finding out what is going on, then carry on as is.
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