hi guys! i have a 99 mustang and it has this ticking noise when the rpms go up. the more you step on the gas the louder the sound gets. the sound is coming from over by the header on passenger side. also it goes through antifreeze like crazy, i found out today that it is leaking antifeeeze out the header. also i never have heat but when i do i comes for about a minute then blows cold. and my temperature rarely ever comes up, it's always at cold. thanks guys for any help!