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AAz overheating, flow direction, water pump
by
jimfoo
on 04 Apr, 2007 19:30
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Ok, I have also had overheating problems in the past. With all the discussion about slipping impellers and such, I decided to take my water pump apart and check it. Something seems weird however. Which direction should the water pump turn and what is the flow direction through it? Are there different shaped impellers? Mine doesn't seem to be ideally shaped for the direction it turns as far as I am concerned. I am wondering if that is my problem.
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#1
by
addautomotive
on 04 Apr, 2007 19:36
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Same rotation as the crank.
FWIW, I find VWs are sensitive to air locks in the cooling system, especially down at the pump & thermostat. I find filling the block from the upper rad hose helps move the air out. (As opposed to filling from the rad)
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#2
by
jimfoo
on 04 Apr, 2007 19:43
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Were there any that turned in the opposite direction? If so, does anyone have a pic of the impeller?
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#3
by
burn_your_money
on 04 Apr, 2007 19:58
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I agree, it would seem to work better if it spun CCW
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#4
by
jimfoo
on 04 Apr, 2007 20:22
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Is that a new pump? My impeller has a 1/8" gap from the bottom, yours looks almost flush. Mine almost looks like it has wear on the sides. It makes me wonder if mine had been slipping, and moved towards the end of the shaft, allowing it to rub. Maybe a new pump is in my future.
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#5
by
burn_your_money
on 04 Apr, 2007 20:26
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yes that is a brand new pump, I just stole it off one of the websites I order from frequently
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#6
by
jimfoo
on 04 Apr, 2007 20:30
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Are the same pumps used on the gas engines? If so, maybe I could get one at the local auto parts store. I guess I have a 1.8 sitting around I could check if I can move enough stuff to get to it.
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#7
by
jimfoo
on 05 Apr, 2007 04:58
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I got to thinking about one more thing. Do VWs have a valve on the heater line? Since mine is non-VW, my heater doesn't have any valve. This means that some hot water is always being recirculated and never sees the radiator, which can't help my temps much.
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#8
by
burn_your_money
on 05 Apr, 2007 08:03
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The MK1s have a vavle that shuts off the supply to the heatercore but after 1984 VW used flaps in the heater box to control the heat, so there is unresticted flow to the heatercore at all times