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By Outlaw56 - 16 Years Ago
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Y block in a 56 Ford F-100 with original heater. Does it make any difference which order the hearter hoses are installed between the heater and the water pump and intake? If so, when heater connection is the outlet and which is the inlet?
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By BFOOTER03 - 16 Years Ago
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Here is a picture of how mine was set up before pulling the motor. It looks like the intake goes to the top and the water pump goes to the bottom. It was not used much but when it was it worked fine. Bing 
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By Ted - 16 Years Ago
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The rule of thumb for heater hose connections is for the water flow to go into the heater core at the bottom connection and then out at the upper most hose connection. This helps to purge the air from the core. On the engine, the hose connection on the intake behind the thermostat is the pressure side which goes to the bottom of the core and the water pump is the suction side which in turn hooks to the top connection of the heater core.
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By BFOOTER03 - 16 Years Ago
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Ted it would apear mine was hooked up wrong. Thanks for the clearification. Bing
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By charliemccraney - 16 Years Ago
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Now I need to check mine.
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By Gordie T - 15 Years Ago
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Ted
Further to this post about water heater hoses. Is it feasible to hook the two heater hoses both to the water pump? My 58 Fairlane is being put back slowly together and my mechanic has hooked both hoses to the water pump. He says it looks better than the hose connecting to the outlet behind the thermostat on the intake manifold. I say he is wrong.
This is starting to become a nightmare and I wish I had the room to do the work myself.
Thanks again....
Gt
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By Ted - 15 Years Ago
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Gordie T (3/31/2010)
Is it feasible to hook the two heater hoses both to the water pump? My 58 Fairlane is being put back slowly together and my mechanic has hooked both hoses to the water pump. He says it looks better than the hose connecting to the outlet behind the thermostat on the intake manifold. I say he is wrong.And right you are. Both the 3/8” NPT connections at the water pump are the same in that they are suction or negative pressure. Hooking up both heater hoses to the water pump will not provide circulation of coolant through the heater core and effectively not supply any heat.
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By charliemccraney - 15 Years Ago
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Gordie T (3/31/2010)
This is starting to become a nightmare and I wish I had the room to do the work myself.
Thanks again....
Gt
Surely you have a driveway, or friends with a driveway, or better yet, friends with a garage. The few times I've had to let someone else work on my stuff, Ive regretted it. With all the flat rate bs, they just don't seem to share my attention to detail.
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By 55Birdman - 15 Years Ago
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Common sense would tell the mechanic how the hoses hook up . Your mechanic must be a VW mechanic.
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By texasmark1 - 15 Years Ago
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funny... mine (57 Fairlane) appears to be hooked up "backwards" (thermostat to top of core; H20 pump to bottom)... but I get warmed air when I run the heater... Mark
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By Ol'ford nut - 15 Years Ago
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Ted (4/1/2010)
Gordie T (3/31/2010)
Is it feasible to hook the two heater hoses both to the water pump? My 58 Fairlane is being put back slowly together and my mechanic has hooked both hoses to the water pump. He says it looks better than the hose connecting to the outlet behind the thermostat on the intake manifold. I say he is wrong.And right you are. Both the 3/8” NPT connections at the water pump are the same in that they are suction or negative pressure. Hooking up both heater hoses to the water pump will not provide circulation of coolant through the heater core and effectively not supply any heat. His mechanic is working by "looks", not how effective (or uneffective) it is.
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By Gordie T - 15 Years Ago
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Thank you all for you help. I am in a position where I have to let him finish putting the engine back in.
I will post again if I ever get it ready to roll instead of hijacking this post. Lets just say that he hit the side of the car with something really heavy and dented my fin, scratched the side, and flattened the stainless trim. Since my car was only built a short time before March 58..the trim is impossible to replace.
Gord
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By DANIEL TINDER - 15 Years Ago
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dinosaur (5/14/2009)
The heater will work with the hoses either way, but as was pointed out, the engine coolant outlet side, (pressure) goes to the bottom of the heater. Mostly to constantly purge air out of it, but also to help sediment from collecting at the bottom of the core.
Wouldn't periodic reversal of the hoses be advisable as a way to "back-flush" the core and extend the life of seldom used vintage car heaters that might sludge-up otherwise? Especially if air was purged from the core first, and car retrofitted with coolant recovery system?
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By Ted - 15 Years Ago
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DANIEL TINDER (4/2/2010)
....Wouldn't periodic reversal of the hoses be advisable as a way to "back-flush" the core and extend the life of seldom used vintage car heaters that might sludge-up otherwise? Especially if air was purged from the core first, and car retrofitted with coolant recovery system?Let's not make this overly complicated. Routing the hoses so that the coolant to always go in the bottom of the core first will keep the sediment issue at bay and by all rights allow any potential sediment to be stirred up enough to be carried back to the engine. Reversing the hoses so you’re filling the heater core from the top just makes for extra work and adds to an issue you’re trying to keep from happening. As ‘Dinosaur’ mentions, as long as coolant circulates through the core, from a heating standpoint it doesn’t care which way the hoses are routed. Sediment control and purging of air from the core are the main reasons for correct routing of the heater hoses. A secondary reason is increased heating efficiency of the heater itself if the air is purged.
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