This is Nuts. I am on my 3rd Heater Core

[maxwedge]

I'd be looking for stray voltage getting into the cooling system, this can eat up heater cores but usually takes longer, put a voltmeter on low scale, one end in the coolant/radiator, ground the other lead, if the voltage is more than .25v there is a problem.

[Rolm]

Originally Posted by maxwedge

I'd be looking for stray voltage getting into the cooling system, this can eat up heater cores but usually takes longer, put a voltmeter on low scale, one end in the coolant/radiator, ground the other lead, if the voltage is more than .25v there is a problem.

I will give it a try. thanks

[Rolm]

An Update I drained the rad and found a lot of white scale. I filled it with water and added around 6 ounces of Muriatic acid to neutralize the scale and lime build up and let me tell you the rad boiled like crazy. I drained the rad again filled with water and ran the engine for a few minutes to get all the acid out. Next I removed one of the heater core hoses and used it to force water and flush the system out, a bit more lime flakes came out and the water that came out of the cooling system was as clean as the water going in. Now this is what I call a flush. I also replaced the upper Rad Hose and filled the Rad with the long life Preston Coolant and I hope all will be well until I decide to sell the car.