What is the easiest way to bleed air out of the coolant system? And is it ok to add green antifreeze to the red antifreeze?
99 monte carlo z34

 

some anti freezers are compatible others are not...id suggest stickin with the same antifreeze that ur already using unless u plan on completly drainin the system and flushing it...as for bleeding the system there should be some bleed vavles somewhere...i am not sure where they r on a 99 z34

 

Don't mix them. Not a good idea. Either flush and change or continue with the same.