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Old 06-16-2007, 21:07   #1 (permalink)
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Question Heater hose confustion

There are two heater hoses - one connects to the water pump and the other to the block. My question is in which direction does the water flow?

1) Does it flow from the water pump through the heater core then back into the block, or
2) Does it flow from the block through the heater core back to the water pump?

Disconnected my heater core many years ago and bypassed the heater core. Now I have replaced the heater core, but can't remember which way the water flows!
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Old 06-17-2007, 03:57   #2 (permalink)
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Re: Heater hose confustion

One would assume that it leaves the waterpump, goes through the car and back into the block.
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Old 06-17-2007, 14:52   #3 (permalink)
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Re: Heater hose confustion

2)
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Old 06-17-2007, 18:28   #4 (permalink)
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Re: Heater hose confusion

OK, it appears there is confusion still. The first reply inidcates 1 while the second indicates 2. Which is it?
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Old 06-18-2007, 04:10   #5 (permalink)
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Re: Heater hose confustion

The block connection is the pressure side of the pump, the pump connection is the suction just like the bottom rad hose. water is pulled in by the pump and pushes through the block. The heater conrtol valve should be on the return to the pump.
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Old 06-18-2007, 16:25   #6 (permalink)
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Re: Heater hose confusion

That makes more sense as the hottest place would be the water coming out of the block, hence that water would be used in the heater core to heat the car and defrost. The part that seems odd to me (and why I was confused) is why the heater control vacuum valve would be AFTER the water goes into the heater core, but BEFORE it gets back to the pump. Seems like the water flow should be stopped before it ever gets to the heater core instead of the other way around. Guess there must be some really good reason it's that way that I'm not aware of. :-)
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Old 06-19-2007, 00:33   #7 (permalink)
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Re: Heater hose confustion

2 reasons,
The return line is cooler so the control valve should last longer.
Better to control on the return to leave the heater matrix coil pressureized so it doesnt air lock.
Also flow to heater should be at the top connection.
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Old 07-13-2007, 21:15   #8 (permalink)
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Re: Heater hose confustion

the way ford made it was,,, the water should go from the block to the heater valve, then into the heater core then straight back to the water pump. cheers
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Old 07-15-2007, 02:53   #9 (permalink)
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Re: Heater hose confustion

i hope that helps the confused masses!
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