Reservoir coolant level suddenly went up

Information and questions on GL1100 Goldwings (1980-1983)
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Posts: 142
Joined: Thu Aug 22, 2019 9:09 pm
Location: Fort Scott, KS
Motorcycle: 1983 GL1100I

Reservoir coolant level suddenly went up

Post by bofler »

Normally my coolant reservoir level sits just below the maximum fill line. It's been that way since the last time I changed the coolant about a year ago. After a 300 mile trip last week, the reservoir level is now sitting about an inch above the maximum line. What would cause this? No signs of head gasket issues. No oil in the reservoir. Why would it suddenly rise?

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'80 GL1100 STD Vetter (2005-)
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Re: Reservoir coolant level suddenly went up

Post by DenverWinger »

Check the hose between the Radiator cap and the reservoir for cracks/leaks. Pay particular attention to the plastic elbow where the hose connects to the reservoir.

It's normal for the radiator to push some coolant into the reservoir on a ride, but what's supposed to happen is that gets sucked back into the radiator after your ride when the engine cools.

If there's any leaks in the line between the radiator and reservoir tank the radiator will only suck air while cooling down and the overflow coolant will stay in the reservoir.
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