If you are getting air in your water system after it sets overnight, then check the tubing from the overflow tank and make sure it is not leaking air back in the system when the antifreeze cools and contracts. Other than that, it will be the cap seal or radiator is bad, and that requires a pressure test while looking for a slow air leak.
If it is the radiator, try Barr's Leak (no other brand will really work) and then working the Mule long enough for it to really warm up. Sometimes the glue that sticks the tanks to the radiator core begins to leak a bit of air and this will most often correct the problem and keeps it from progressing.
If it is the radiator, try Barr's Leak (no other brand will really work) and then working the Mule long enough for it to really warm up. Sometimes the glue that sticks the tanks to the radiator core begins to leak a bit of air and this will most often correct the problem and keeps it from progressing.
