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#635416 - 01/15/05 09:39 PM What happens when a radiator cap goes bad?
Shaman Offline


Registered: 07/27/04
Posts: 2327
Loc: Frankfort, Kentucky
I was riding my bike, and I parked it and walked away for a while, and noticed that there was radiator fluid on the ground inline with my radiator/radiator cap. It's full fairing so i don't really know where it leaks out of. The bike had been highway for 15 minutes. When i got the bike, and checked the fluid, there was practically none in it. Does this sound like a radiator cap, radiator, or head gasket?

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#635417 - 01/15/05 10:09 PM Re: What happens when a radiator cap goes bad?
Chris142 Offline


Registered: 06/05/03
Posts: 13888
Loc: apple valley, ca
Caps fail 2 ways.

1. They quit sealing which won't allow pressure to build up. Water will be pushed out the overflow tube.

2.(Most common failure) The rubber expands so that it totally seals the radiator into a shut system. When this happens pressure can't be released. Plastic radiator tanks crack, solder joints pull apart. heater valves leak and hoses can blow.

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#635418 - 01/16/05 04:26 AM Re: What happens when a radiator cap goes bad?
drive it forever Offline


Registered: 09/03/04
Posts: 843
Loc: Grove City, OH
A bad cap lowers the boiling point. Usually, a bad head gasket will make the engine overheat, and it happens rather quickly even with a cold engine.

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