Subject:1986 RX-7
Problem:System is running cool,but dumps collant into the overflow bottle,but doen't recover it,Thus,turning on my dummy lite and BUZZER.
I have cleaned out the recovery bottle,seemed to help a little.Changed the cap,dident do anything.Blead the system,cold,diden't help. anyone have any ideas?

 

make sure you get all the bubbles out of the big hose coming from the radiator.

 

need to pressure test cooling system,bet you have a leak somewhere or
might be the cap...

 

The hose from the fill port TO the overfill tank MUST be air tight. If not, when the engine cools, the radiator will suck air back into the radiator instead of the water in the overflow tank. Either that hose is not air tight OR you have a small leak elsewhere. The small leak elsewhere will also just suck air back into the radiator instead of the water in the overflow tank.

For extra measure...buy a new radiator cap, it could be mucking up , but my bet is on a leak in the hose b/t the overflow and the fill port.