Couple of Problems 04 Corolla S

I have an 04 Corolla S with 268,000 miles. I started loosing coolant with no viable leak. I have done compression tests and a block test and there is no issues there. The plugs look good as well. I recently replaced the radiator, hoses, and thermostat. I bled the system 3 times to make sure I had no air pockets. Any suggestions? Also, my cruise control is acting up. The light will blink and stay on but the cruise will disengage. I have replaced the module behind the gauges and it helped for a few days but it started doing it again. All fuses, connections, and other components test good. Any suggestions on this too? Thanks, any help is greatly appreciated