I have a M998 with a 6.5 GEP motor. Is it normal for the hydronic fan clutch engage fairly often. Example. 80 degree day. Fan will engage 5 times for 30 seconds or so in a 10 mile drive. (Normal or not?). I replaced hoses. Flushed out twice. Replaced cap and thermostat. No debris and fins straightened. I do have a armored grill in hood.