I own a 1998 mustang GT manual with 136k miles. When I bought it, radiator is crack, so I replace it, ( my mechanic replace a automotive radiator, not a manual readiator . you guy think that cause the problem ? ) 2 week later I found coolant is leak out of my thermostat bolt, so I went and bought a new T-Stat and 0-ring. when I install it, I found out that my old t-stat dint have an 0-ring, is the 0-ring support on top of the t-stat or under the t-stat ? after install I add more coolant, runing to normal temperture, take it for a ride, then went home, I saw alot coolant leak out near the coolant cap, you guy think my cap is cause coolant to loose or any thing cause my coolant to loose ? my car temperture now is not point to the mid temperture any more, its point very closer to the middle, what happent ? thanks