I forgot to mention the antifreeze. In the manual, I believe- if I remember correctly, to use a 50/50 mix . Distilled water is a good idea- that will help keep deposits down. Sometimes folks have a hard time getting all the air out. I ran mine with the cap off and let it burp a few times - till it quit- topped it off , replaced cap. Mine did ok with that, some folks elevate the front to aid the process. Does it check ok as far as the quality of the antifreeze? Mine checked # of the colored balls ) down to -20 . I changed it once in the 5 years so I went over the suggested maintenance time a bit or two.. . collie