Radiator Cap or something else....


Information and questions on GL1100 Goldwings (1980-1983)
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Psycheonabike
Posts: 200
Joined: Sun Feb 10, 2019 5:00 am
Location: England UK
Motorcycle: 1985 Aspencade

Radiator Cap or something else....

Post by Psycheonabike »



Honestly though I'd managed to get myself a runner after all this work. Apparently not.

Replaced coolant after replacing timing belts. All good until I took her out. After about 15miles she starts overheating then coolant starts gushing out of the radiator cap. Fan comes on but not until this happens. Then when she cools down she is ok for another 10 miles before it starts again.

Any ideas?

1982 GL1100


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Maz
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Motorcycle: 1975 GL1000K1
1976 CB500T
1979 CB750L
1990 Yamaha FJ1200
1993 Suzuki GS500E

Re: Radiator Cap or something else....

Post by Maz »

If it's coming out of the radiator cap, the cap or seal may be suspect. If pressure is getting past the cap as the coolant heats up , the coolant will boil.
Maz
Ironically, Common Sense is the LEAST common of all senses!
Psycheonabike
Posts: 200
Joined: Sun Feb 10, 2019 5:00 am
Location: England UK
Motorcycle: 1985 Aspencade

Re: Radiator Cap or something else....

Post by Psycheonabike »

Is the cap repairable or just replace?
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DenverWinger
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1980 GL1100 STD Vetter (2005-)
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1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
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Re: Radiator Cap or something else....

Post by DenverWinger »

Just replace it. A standard automotive cap fits perfect.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
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Psycheonabike
Posts: 200
Joined: Sun Feb 10, 2019 5:00 am
Location: England UK
Motorcycle: 1985 Aspencade

Re: Radiator Cap or something else....

Post by Psycheonabike »

Thanks. So that hot water overflows into the expansion tank?
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Maz
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Joined: Tue May 19, 2015 4:43 am
Location: Kent, UK
Motorcycle: 1975 GL1000K1
1976 CB500T
1979 CB750L
1990 Yamaha FJ1200
1993 Suzuki GS500E

Re: Radiator Cap or something else....

Post by Maz »

As the water heats up and expands, it should go into the expansion tank and then as it cools, it gets drawn back out again. It's the system pressure that prevents boiling (13psi approx) so if the radiator cap is leaking, the pressure is low so the water boils and comes out where the leak is. It's a good starting point.
Maz
Ironically, Common Sense is the LEAST common of all senses!
Psycheonabike
Posts: 200
Joined: Sun Feb 10, 2019 5:00 am
Location: England UK
Motorcycle: 1985 Aspencade

Re: Radiator Cap or something else....

Post by Psycheonabike »

Thanks @maz ....I'll get a new cap and report back!


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