mmt 15 Posted June 17 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 Share this post Link to post Share on other sites
welshpug 1,644 Posted June 17 probably the cap, fit a TD cap as its higher pressure. unless the tank is split. Share this post Link to post Share on other sites
mmt 15 Posted June 17 Thanks G. The tank is fine. Volvo tank. It is probably the cap. Scrap yard is next. Share this post Link to post Share on other sites
