running straight anti-freeze isn't good. anti-freeze by itself isn't a good coolant. do a 50/50 mix. the higher the percentage of anti-freeze the worse the heat transfer. another thing i've found is water pumps do make a difference. flow kooler has been the best for me and the 440 source unit absolutely the worst.

Last edited by lewtot184; 05/18/21 07:44 PM.