Upper Heater Hose

JimVG

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Gig Harbor, WA
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Jim
Truck Year
1978
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K20
Engine Size
350
Hello,

I just installed a new direct fit/replacement radiator with brass tanks on my 1978 K20. It’s a 350/auto with no air conditioning. The upper radiator hose connected to the radiator on the upper, passenger side.

I attempted to have the original rebuilt, but it was too far gone and they discarded it. I now have no example to look at.

This new radiator has a fitting to accept the heater hose. It is a brazed-on port with female threads.

My question is: is there a fitting that threads into this port to accept the hose, or does the hose simply clamp on like a typical hose connection?

I assume that it’s threaded to accept a plug if this port is not used?

Thanks for your tiime,

Jim
 
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DoubleDingo

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Carb'ed Vortec 350; 1972 L48 350
Need pics of the radiator in question. The threaded fitting is probably for the trans cooler line(s), usually two of them, with a smaller nipple for the heater hose above them. But need pics.
 

fast 99

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Picture would help but manufacturers have consolidated part numbers. Without seeing it some of those outlets are threaded inside. You can either get a pipe plug that fits or a neater hose rubber cap.

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JimVG

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K20
Engine Size
350
Thanks for the reply’s. It’s not the trans lines. They are below this port. I called the radiator shop that attempted to re-built it. The tech told me that this port is threaded for a plug when not in use. The 3/4” upper heater hose fits over the port and uses a standard clamp.
 

DoubleDingo

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81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
Engine Size
Carb'ed Vortec 350; 1972 L48 350
I just bought a new radiator today, I'll have to see if mine is threaded or just brazed.
 

WFO

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Engine Size
350
Hello,

I just installed a new direct fit/replacement radiator with brass tanks on my 1978 K20. It’s a 350/auto with no air conditioning. The upper radiator hose connected to the radiator on the upper, passenger side.

I attempted to have the original rebuilt, but it was too far gone and they discarded it. I now have no example to look at.

This new radiator has a fitting to accept the heater hose. It is a braised-on port with female threads.

My question is: is there a fitting that threads into this port to accept the hose, or does the hose simply clamp on like a typical hose connection?

I assume that it’s threaded to accept a plug if this port is not used?

Thanks for your tiime,

Jim
You need a brass male pipe thread to barbed fitting.
 

DoubleDingo

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Jul 3, 2012
Posts
8,076
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8,541
Location
Right where I am
First Name
Bagoomba
Truck Year
1981, 1965
Truck Model
81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
Engine Size
Carb'ed Vortec 350; 1972 L48 350
Yep, it has a threaded plug, but is brazed on to the tank.



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