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Discussion Starter · #1 ·
The upper radiator hose on my 89 RC keeps sucking down flat. I put a new hose on and it still sucks it flat. The coolant is full,the thermostat is functioning and everything is fine as far as operating temp. and all. It creates a vacuum in the radiator and when you release the cap the hose opens up.
Any ideas would be appreciated. Thanks in advance.
 

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I concur with thaxton!
 

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And make sure your breather line that goes to the overflow container isn't plugged up.
 

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I concur with Vegeta; too much over-pressure -> radiator cap. Too much under pressure -> expansion tank line.
 
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