Hissing

[mmt 15]

Hi Guys

Ran my engine varm last night in the garage. I could hear a vissing noise from the expansion tank cap. Tightening it did not help. Is hissing bad or ok? 
 

Use it for track only - water temp usually fine.  
 

do I change the tank or is it ok as it is? 
 

thanks 

/M

[welshpug 1,657]

probably the cap, fit  a TD cap as its higher pressure.

 

unless the tank is split.

[mmt 15]

Thanks G. 
 

The tank is fine. Volvo tank. It is probably the cap. 
 

Scrap yard is next.