Long fast highway drive at 90mph - then rough city driving - then I saw steam - haha - I also might have heard warning chime or two - sadly I have a trouble code light on for other simple issue with a tiny vacuum hose leak - but now I got 2 new codes and am low on coolant in reserve tank and top radiator hose only feels half full. The two new codes are 0303 & 0344. Here is a picture of steaming leaking cap before opening. Any advice?