Rusty Coolant water and High Frequency Start

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The HF (high frequency) start on my old Lincoln 300/300 welder had stopped working and after a lot of trouble shooting, I’m thinking that the problem is in my dirty rusty colored cooling water.   I flushed it out and put distilled water in it, ran it for a while and there is still a tint of orange rust color to it.   I tried the welder and the HF did work and for a few tries it didn’t .  I’ll flush the system out again this evening.   Is it possible that the HF is getting grounded through the dirty coolant?  Thanks
Reply:Is it possible that the HF is getting grounded through the dirty coolant?
Reply:Well, I didn't smell it before I flushed it once.   I found a metal part, which I think was part of an insert thing that held on the cover on the cooler.   It had been sitting in the water for years rusting, so I think the color of the water is from rust.