The bug thing is a major cause for a lot of overheating and often gets overlooked. DO NOT use High Pressure washer to clean them out.. The high pressure can and will most likely bend the fins of the radiator and if you do it from the front, you will just push the bugs farther into the radiator..
Use a gentle stream of water from the front to soak and soften the carcasses of the bugs.. A little soap will help too. Then from the engine side of the radiator, flush with a gentle stream towards the front. Use only the amount of water pressure needed to flush the crap out without bending the fragile fins.
Billy, even if the water temp goes down by 30 degrees, the enngine still needs to operate at a certain temp for proper combustion, If it never reaches that temp, it can cause problems. But, on the other hand, if it can operate at proper temp and the additive helps from going over that temp.. Then that's good. Mainly a try it a see thing.
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