Hey there Onion,
I have rubber tubing that interrupts the Trans cooler lines to insure that there is no electricity running down the trans lines.
I have also had every groundunder the hood and in the front end checked or replaced. The only thing that is touching the radiator is an AC Condensor bracket. I have had the fluid checked for electricty and there was none found. They checked the starter for a good ground and it was good. All the battery cables seem fine. The original battery positive connect was corroded badly and was switched to a top mount. All three cables that were connected tot he side mount are connected to the top mount now. I don't see how it could affect it but I would switch it out if you think it would help. I actually have an email in to someone about how much a whole new battery cable for a Caprice will cost.
-JB
Originally Posted By: onion
Here's an idea that has likely been thrown around before in the eight pages where we've discussed your problem... but I'll try it anyway. Where does the ground cable from your battery run? I assume it runs to someplace on the engine. BUT! Is there any sort of cable or ground strap running either from the engine to the frame, or from the negative battery terminal to the frame?
There needs to be some sort of ground connection between the engine and the frame. Lots of vehicles have an extra (thick) wire attached to the negative battery terminal that grounds the frame and/or body... some use a ground strap between the engine and the frame and/or body.
See, you mentioned that this leak always occurs on the same side as the transmission cooler lines- sometimes close to them, and sometimes actually AT those fittings. Could electrical circuits in the vehicle be grounding THROUGH the radiator, back through the trans cooler lines, then to the battery via the negative battery cable?