GL1000 Radiator Replacement


Information and questions on GL1000 Goldwings (1975-1979)
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Bojac
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Joined: Mon Sep 18, 2017 6:41 pm
Location: Washington, D.C., U.S.A.
Motorcycle: 1977 GL1000

GL1000 Radiator Replacement

Post by Bojac »



My 1977 GL1000 developed a pinhole leak in the radiator block behind the fins near to the filler cap. I've implemented the "black pepper" fix as a temporary solution but for the longevity of the bike I'd like to get an off-the-shelf radiator to replace it with. All the GL1000 radiators I can find for sale are ~40 years old but I did find two companies that make aftermarket GL1100 radiators. Are GL1100 radiators interchangeable with GL1000 radiators?
Here are their Honda part #'s:
GL1000 - 19010-371-003
GL1100 - 19010-463-003
And here are the options for new radiators I found:
GPI - http://www.gpiautoparts.com/goods.php?id=1040
Worley - https://worleyautoparts.com.au/product/ ... 80-1987-2/


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SnoBrdr
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Location: Providence, Rhode Island
Motorcycle: 1978 GL 1000

131K Original Owner

Re: GL1000 Radiator Replacement

Post by SnoBrdr »

Bojac wrote: Thu Apr 04, 2019 9:00 am My 1977 GL1000 developed a pinhole leak in the radiator block behind the fins near to the filler cap. I've implemented the "black pepper" fix as a temporary solution but for the longevity of the bike I'd like to get an off-the-shelf radiator to replace it with. All the GL1000 radiators I can find for sale are ~40 years old but I did find two companies that make aftermarket GL1100 radiators. Are GL1100 radiators interchangeable with GL1000 radiators?
Here are their Honda part #'s:
GL1000 - 19010-371-003
GL1100 - 19010-463-003
And here are the options for new radiators I found:
GPI - http://www.gpiautoparts.com/goods.php?id=1040
Worley - https://worleyautoparts.com.au/product/ ... 80-1987-2/
Have you taken the radiator to a decent radiator shop?

The radiators are brass and are easy to repair.

The radiators are not interchangeable.
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offcenter
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Motorcycle: 99 Gl-1500 SE
76 GL-1000
77 Honda Trail 90

Re: GL1000 Radiator Replacement

Post by offcenter »

I second a good radiator repair shop.
They should be able to fix it easily.
And they'll boil it in their cleaning tank too which
will clean it out inside.
George in Jersey.
99 Goldwing GL-1500 SE
76 Goldwing Gl-1000
77 Honda CT-90 "Trail 90"
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Bojac
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Joined: Mon Sep 18, 2017 6:41 pm
Location: Washington, D.C., U.S.A.
Motorcycle: 1977 GL1000

Re: GL1000 Radiator Replacement

Post by Bojac »

Fair enough! Thanks for the feedback, I’ll find a local shop to take it to. I was also told doing a citric acid flush might be a good idea just to make sure there’s nothing weird in my cooling system.
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redbug
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Location: Broken Arrow,Ok
Motorcycle: 1983 Gl1100I
1986 Harley FLHT

Re: GL1000 Radiator Replacement

Post by redbug »

Just a note: The bottom tank can be reinstalled turned around or backwards however you say it. Now this is on the 1100's. Not sure about your 1000, but...
" Riding on Tulsa Time "
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landisr
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Location: Gilbert, AZ
Motorcycle: 1976 GL1000
1976 GL1000LTD
1994 GL1500A

Re: GL1000 Radiator Replacement

Post by landisr »

A radiator shop will also pressure test it and probably give it an overall professional inspection/evaluation.

Ron in AZ
I'm not so sure about an inner child, but I have an inner idiot that surfaces every now and then.. :mrgreen:
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Bojac
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Joined: Mon Sep 18, 2017 6:41 pm
Location: Washington, D.C., U.S.A.
Motorcycle: 1977 GL1000

Re: GL1000 Radiator Replacement

Post by Bojac »

Took it to a radiator shop and they tested it au gratis. The factory weld or connection from the filler to the block is where the leak was happening. The shop would re-core it for $330 which seemed a lot. I’m just buying another used one off eBay for the intermediate and then getting a new Chinese aluminum one. GPI racing said they’ll make me one for $100 which is great. They’re pretty fragile comparatively I’ve heard, so I’ll fashion a grill to go in front of it. We’ll see how long it lasts...
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Bojac
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Location: Washington, D.C., U.S.A.
Motorcycle: 1977 GL1000

Re: GL1000 Radiator Replacement

Post by Bojac »

Thanks for all the recommendations!

I found a thread on naked gold wing club where someone bought one from GPI and had pretty good luck with it.
froche
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Motorcycle: 1985 Goldwing Aspencade (GL1200A)
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Former bikes;
2000 R1100RT
2005 Suzuki Bandit
1979 Yamaha XS1100
1978 Yamaha XS1100 Special
1990 Yamaha XV250
1980 Yamaha XV750
1979 Honda CB750
1968 Triumph Bonneville T120
1973 Honda CB450
1968 Harley Davidson Sportster
1974 Honda CB750
1968 Honda CL72

Re: GL1000 Radiator Replacement

Post by froche »

You can resolder the connection with a propane torch and solder.


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