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My 94 has the old style all metal radiator and since I got it and replaced the stuck wide open for years thermostat it's started scaling up on me. I was running prestone premixed in it for a couple years but about 6 months ago I switched to fleetguard with dca already added and distilled water. I also recently put on a full flow coolant filter in the line to the heater core trying to clean it out.
I was just adjusting the coolant and looked down in the top of the radiator and about half the tubes I can see are plugged with scale. It's getting a little warm according to the factory gauge when I pull long hills too and the camper is on. Should I just go have the radiator cleaned out at a radiator shop or is there any additive that can safely descale it these days? Flushing it isn't an option. we're on a farm and have really hard water and really soft water in the house. one will make it worse and one is a little on the salty side. That can't be good.
I'm surprised to hear with distilled water your getting scale! I don't know for sure but with the older style radiator I think that a radiator shop can boil it out.
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