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Either KDS or Narton TSU work with either mfg S3…does not make a difference. Stay away from anything from MME,FMP or ES, buy only from MAC or HPG to guarantee you get an OEM part backed by a good return policy. No idea who says not to use auto store sourced green coolant, it’s made specifically...

install a new TSU and go from there

What start box Do you have? I’ve had hundreds of trucks….yes, I’ve seen this issue, but generally from the early EESS boxes, not so on the S3… The issue is not common…