Hissing noise from radiator it sounds like

[Frisco 415]

There is a hissing noise coming from my bike it seems like the left side of the radiator, but not the right. It also seems to get worse when I go faster, but is not always there. What is this and how do I fix it? Thanks in advance

[J.Ackel]

Visually, is there denting to the radiator fins? New dents you havent noticed before? Inspect hose coming off of left side radiator. Also inspect air release valve for tightness. You work on radiator lately? Also if ridden before problem is solved, inspect coolant level before each ride until you get it solved.

[J.Ackel]

Hey TT experts, would the old soapy solution of water in a water bottle help pinpoint air release?

[DRZ400Senior]

There is a hissing noise coming from my bike it seems like the left side of the radiator, but not the right. It also seems to get worse when I go faster, but is not always there. What is this and how do I fix it? Thanks in advance

If you have a hissing noise that's not always there, is louder as you go faster and you're not losing coolant, its a wind noise. Check your plastics see if anything ls loose. Check your radiator guards, the plastic fin pieces, is a piece of fin missing, or anything loose that will be letting air by that normally wouldn't be....

[Qqqqqqqqqqqq]

Check for Snakes under the seat ?

[Craigo]

If you had a leak from a radiator it would be fluid , not air