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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Heater hose

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Old Jun 18, 2019 | 03:04 PM
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Heater hose


Anyone know the function of this "T" and interconnect hose? Appears to tie the two heater hoses together....leaves one heater hose and goes directly to the other one back near the rear of the front fender. This is the only 302 I've had that has had it. This is on a 71 F100, and neither my 72 or 76 had this setup.
 
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Old Jun 18, 2019 | 03:14 PM
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RichS2659
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Obviously you have never pulled your air cleaner off. That is the hot water supply to warm the automatic choke, so the choke pulls off quicker as the engine warms up. It still uses the original Ford hoseclamp.
 
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Old Jun 18, 2019 | 03:29 PM
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Originally Posted by RichS2659
Obviously you have never pulled your air cleaner off. That is the hot water supply to warm the automatic choke, so the choke pulls off quicker as the engine warms up. It still uses the original Ford hoseclamp.
I've had the carb and air cleaner off, but nothing with coolant running through it provides heat to my choke. On mine, it has a small metal hose going from the passenger side exhaust manifold to heat the automatic choke.

This hose literally goes from one heater hose over to the other heater hose.
 
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Old Jun 18, 2019 | 03:52 PM
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I'm still learning, but on the engines that I've seen, that hose would connect to a plate under the carb. There would be a Y fitting on top of the water pump with a line going around the passenger side back to the heater and the other branch would go to an inlet on that plate just under the fuel line connection. The picture is dark, but yours doesn't seem to have that hose. Then the hose you are asking about connects to the back of that plate to bring the coolant back to the system and heater. As noted, this is for better operation of the carb in cold weather. From what you describe, that hose is doing nothing.
Someone more experienced my know a different function.
 
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Old Jun 18, 2019 | 06:19 PM
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On my 71 all original 302 it runs next to the choke thermostat and is held with a clamp or bracket, then tees into the heater system.
 
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Old Jun 18, 2019 | 06:30 PM
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Originally Posted by mrpotatohead
On my 71 all original 302 it runs next to the choke thermostat and is held with a clamp or bracket, then tees into the heater system.
Mine runs through the same carb bracket. But just to clarify, yours also only connects one heater hose to the other, correct? It's not carrying coolant to the carb as suggested above?
 
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Old Jun 18, 2019 | 08:02 PM
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Found this on the Fordification site and apparently my setup is factory correct....just unsure why the heater hose crossover pipe is needed? The FE engine looks to have different routing.
 
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Old Jun 19, 2019 | 12:15 AM
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Correct, some of the FE's use a heated carb spacer.
 
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Old Jun 19, 2019 | 12:27 AM
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Here's a picture. If you look closely you can see both ends of the heater hose loop you're talking about.
 
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Old Jun 19, 2019 | 03:53 AM
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Here is a picture of the heated carb base plate that was on my F350. Since it doesn't stay that cold here I replace it, and did away with the extra hoses.

I put caps on the hose pipes, and used the old heated spacer for a short time.
 
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Old Jun 19, 2019 | 08:56 AM
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Yeah, I'm not a fan of this design. I'd at least want a small 1/4 turn valve inline to shut the thing off in the warmer months. These trucks don't need another reason to experience a hot soak fuel percolation condition.
 
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Old Jun 19, 2019 | 09:17 AM
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Well I guess I'll leave it in place since it's correct and original. Still not sure why it's there on the 302 though. Seems like it's doing nothing!
 
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