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Black art of keeping the Bird cool


Tom

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Also watch to see if the thermostat is working properly. On the 99, the gauge will almost reach H before the fan kicks in and keeps the needle in the top 1/3 of the gauge.  My 99 had a bad one, and air kept getting into the system.  No issue when going at speed, but I kept getting boil overs when still.  It’s a cheap enough replacement if you’re going to take the tank off anyhow.

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7 hours ago, Karl said:

Will do I’ve read it can also be the rad cap which can fail over time worth replacing at the same time I think 👍

 

I did have one that was weeping, so I assume that meant either the seal had failed or the spring was soft.

 

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If the cap isn't holding pressure the coolant can boil at a hot spot without changing the indicated temp so it'll burp some out of the reservoir.

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