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M103 Cooling system flow direction
So I was looking at my cooling system and put my aux water pump back on after I had it off for some years, but after looking at how it is supposed to be installed, it doesn't make sense. The hose connecting the aux wp to the coolant pipe going to the belt driven water pump shows that the coolant flows from the aux wp to the pipe. However, the other hose from the aux wp goes to the hose leading to the heater valve and heater core. So shouldn't the aux wp be pumping the coolant towards the heater core? I assume it should flow that way because the heater valve is there to block the flow of coolant when no heat is needed. I bench tested the aux wp and the water flow is indeed going in the direction of the belt driven wp and there is even a small arrow stamped on it that shows which direction it flows. Anyone have any intellect on this or am I missing something? This isn't the first I've noticed that there seems to be a mistake or fault with the MB design. The EGR valve with the check valve is another that has always baffled me, but no one seems to be able to explain that either. Hmmmm
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1990 190E 3.0L |
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If your rad is metal,you can have a shop add extra rows for better cooling.
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
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The water pump has both an intake and a discharge. Just because it goes "to the pump" doesn't mean it's on the discharge side.
Does the heat work? If so, it isn't wrong.
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Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) |
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Coolant leaves the engine by the oil filter, goes through the heater core then goes through the monovalve for flow control. Yes, the heater core can get hot when you don't want it to, such as when parked after a drive on a hot day. That's how MB made it.
Where is this EGR check valve? AFAIK there's a simple vacuum actuated valve on the forward exhaust manifold connector then a pipe to the intake manifold. Sixto 98 E320s sedan and wagon |
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Quote:
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1990 190E 3.0L |
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That’s how I’d design it but not how MB made it.
Sixto 98 E320s sedan and wagon 02 C320 wagon |
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help
This might help its for the M103 .
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Quote:
Duke |
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You would want the valve and aux pump on the outlet of the heater core so they see lower temperatures. After all they are plastic with rubber components and higher temps would lower their life.
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