radiator


Information and questions on GL1000 Goldwings (1975-1979)
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tommydog
Posts: 60
Joined: Sat Jul 23, 2011 7:24 pm
Location: Union City Tn.
Motorcycle: 1979 Gl 1

radiator

Postby tommydog » Thu May 31, 2012 1:34 pm



The bike has been running a little hotter than nomal. I opened the radiator cap and water came to the top just overflowed for about 5 min. with the bike just sitting there.The bike had not been running .I was just looking to make sure it had water. The overflow is empty. Any suggestions or ideals of what would cause this. Thank YOu



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WingAdmin
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Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
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2007 Aspen Sentry Trailer

Re: radiator

Postby WingAdmin » Thu May 31, 2012 4:06 pm

Wow. So it was cold, you undid the radiator cap, and it poured out? Was it water, or coolant? I would suspect the radiator cap, being that if there was pressure in there to push the coolant out when it was opened when cold, the cap should have been routing that to the reservoir. If it was letting coolant in from the reservoir when cool and not letting it out when hot, I suppose I could see this being the cause. If that is the case, then the radiator hoses must have been stretched to the breaking point with pressure, which could explain why the coolant flowed out when you opened the cap (as they contracted).

I would first try replacing the radiator cap, but I would strongly advise also replacing the radiator hoses - if they have been stretched like that, I wouldn't trust them anymore.

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scotterichmond
Posts: 613
Joined: Fri May 06, 2011 3:49 pm
Location: Marblemount,wa
Motorcycle: 1975 GL1000
[img]http://images.goldwingdocs.com/scotterichmond_32376/Modestly_restored_1975_GL1000_750/engine_repainted_even_new_embl_3919.jpg[/img]

Re: radiator

Postby scotterichmond » Thu May 31, 2012 4:30 pm

I think Wingadmin nailed it , and , a cap is cheap, plus if it is OEM and old........... well you get it .

tommydog
Posts: 60
Joined: Sat Jul 23, 2011 7:24 pm
Location: Union City Tn.
Motorcycle: 1979 Gl 1

Re: radiator

Postby tommydog » Thu May 31, 2012 8:22 pm

WingAdmin wrote:Wow. So it was cold, you undid the radiator cap, and it poured out? Was it water, or coolant? I would suspect the radiator cap, being that if there was pressure in there to push the coolant out when it was opened when cold, the cap should have been routing that to the reservoir. If it was letting coolant in from the reservoir when cool and not letting it out when hot, I suppose I could see this being the cause. If that is the case, then the radiator hoses must have been stretched to the breaking point with pressure, which could explain why the coolant flowed out when you opened the cap (as they contracted).

I would first try replacing the radiator cap, but I would strongly advise also replacing the radiator hoses - if they have been stretched like that, I wouldn't trust them anymore.


It looked like pure coolant,it didnt really pour out but it did startin runnig over as soon as I turned the cap 2 the click LOL When I took the cap off It started drippin out & dripped out i no for 3-5 mins when it did stop the coolant was at the top of the radiator u cld not put the cap back on without it overflowin a lil. The cap is routed to the reservoir which is empty. & <<<< I TY again 4 the help >>>>

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Fred Camper
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Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: radiator

Postby Fred Camper » Thu May 31, 2012 9:38 pm

With the cap off be sure coolant flows freely from the reservoir back to the rad. Coolant contracts as it cools, so the pressure must have been very high when running. Agree on the need for cap and rad hose replacement.

tommydog
Posts: 60
Joined: Sat Jul 23, 2011 7:24 pm
Location: Union City Tn.
Motorcycle: 1979 Gl 1

Re: radiator

Postby tommydog » Fri Jun 01, 2012 8:49 am

I read the How to replace your radiator hoses on a 1100 cldnt find it on a 1000 is there much differance ( 1979 ) & THE Radiator has 2 b took off the bike 2 do this ?

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Fred Camper
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Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: radiator

Postby Fred Camper » Fri Jun 01, 2012 9:09 pm

Just looking at it, I bet the hose is flexible enough to get on there without moving the radiator.

tommydog
Posts: 60
Joined: Sat Jul 23, 2011 7:24 pm
Location: Union City Tn.
Motorcycle: 1979 Gl 1

Re: radiator

Postby tommydog » Sat Jun 02, 2012 7:19 am

I sure hope so LOL TY

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eklimek
Posts: 307
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Location: St Catharines Ontario Canada
Motorcycle: 81 GL1100 (Widowmaker not in service), 83GL1100, CB350f x 6, CB400f x2, CB550f sold, CL350 (seized engine), plus enough donors to take me through retirement.

Re: radiator

Postby eklimek » Sat Jun 02, 2012 9:26 am

If the overflow is empty you have lost coolant but the system remains under pressure as described. If the description is continuous flow upon cap removal it suggests trapped air bubble(s). Running hotter means poor or inefficient heat transfer. Coolant has boiled.

When the thermostat opens does the rad "burp"?
Does the fan work?
Is the water pump weep hole dry?

tommydog
Posts: 60
Joined: Sat Jul 23, 2011 7:24 pm
Location: Union City Tn.
Motorcycle: 1979 Gl 1

Re: radiator

Postby tommydog » Sat Jun 02, 2012 9:41 pm

[quote="eklimek"]If the overflow is empty you have lost coolant but the system remains under pressure as described. If the description is continuous flow upon cap removal it suggests trapped air bubble(s). Running hotter means poor or inefficient heat transfer. Coolant has boiled.

When the thermostat opens does the rad "burp"? <<<<< Not sure what ya mean, how wld I no >>>>>
Does the fan work? <<<<< Yes >>>>>
Is the water pump weep hole dry? <<<<Ill check that sld i ride it a while 1st ?>>>>

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eklimek
Posts: 307
Joined: Tue Feb 15, 2011 1:55 pm
Location: St Catharines Ontario Canada
Motorcycle: 81 GL1100 (Widowmaker not in service), 83GL1100, CB350f x 6, CB400f x2, CB550f sold, CL350 (seized engine), plus enough donors to take me through retirement.

Re: radiator

Postby eklimek » Sun Jun 03, 2012 6:49 am

As the coolant circulates trapped air is displaced. This gives the appearance and sound at the rad of a belch and the coolant level drops.




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