coolant leaking?
 

i have a 98 sts and have had problems with it for the past few weeks. Mainly suspension and braking problems but now my coolant is leaking or so to speak coming up thru the coolant reservoir cap. My car is running fine but i just hope that getting a new cap might fix the problem. I've read about similar problems but nothing seems to fit with my problem. I hope its not a head gasket problem. My car is not smoking or overheating. Although my cars temp seems to move slowly from the middle to the right but not much at all. Say this is the temp meter. C I I I M I I I H. It moves from the middle to in between the first line to the right. any ideas what might be causing the leak?