[Richard]

Ok before you install a new coolant filter with SCA additives. What coolant are you using. Are you using the old school, normally green, with SCAs. OR are you using the new school. Red or pink with OAT additives? If using the oat coolant do not use a filter with SCA additives. You use a plain filter with the red or pink coolant. All coolant is ethylene glycol based. It does not go bad. It does lose its additive package which protects the wet liners a d it does get grit in it which murders your water pump. Both the green and the pink styles have readily a amiable chemical additives to restore it to new. The green can be tested with the strips but the pink is not so easy