George,

Most people put the trans temp sender in the oil pan, which line did you put it in; the one that goes to the cooler or the one that
comes from the cooler?

I note that you've said; " I gave a twist on a clamp at the auxiliary cooler" are you aware that the radiator gets it's ground
through the steel lines to the trans cooler in the radiator. If you have installed an auxiliary cooler in those lines with rubber
connections you have broken that ground.

Regards,
Rob M.
The Pedantic Mechanic

Different materials placed in a conductive medium will result in a difference in voltage potential as charge carriers are stripped from one material and build up on the other. This is electrolysis from nobility of materials. The removal or deposition results changes the atomic structure of the materials. This is what causes internal corrosion in radiators and heater cores. A return path of very little resistance (ground wire) prevents the voltage difference and subsequent electrolysis.

Aluminum radiators and heater cores are more noble than the cast iron engine block, and they will degrade fairly quickly after the coolant changes composition in about 3-4 years because the materials are very thin. If the coolant is Dexcool, the change will occur rather suddenly, the heater core will fill up with orange/brown mud, and the coolant will be very destructive to plastic fittings and plastic radiator tanks. The oil in the plastic gets bleached out and then it shrinks in size and turns very brittle, finally degrading to dust.

wrote on Thu, 25 September 2014 09:59]Terry,
If all this is a big enough concern, why are most modern vehicles not equipped with grounding features on the rads and heater cores?

I am starting to develop the opinion that the grounding isn't all that necessary provided we perform the recommended cooling system maintenance, specifically coolant replacement.

Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress



On Sep 25, 2014, at 1:21 AM, Terry wrote:

Different materials placed in a conductive medium will result in a difference in voltage potential as charge carriers are stripped from one material
and build up on the other. This is electrolysis from nobility of materials. The removal or deposition results changes the atomic structure of the
materials. This is what causes internal corrosion in radiators and heater cores. A return path of very little resistance (ground wire) prevents the
voltage difference and subsequent electrolysis.

Aluminum radiators and heater cores are more noble than the cast iron engine block, and they will degrade fairly quickly after the coolant changes
composition in about 3-4 years because the materials are very thin. If the coolant is Dexcool, the change will occur rather suddenly, the heater core
will fill up with orange/brown mud, and the coolant will be very destructive to plastic fittings and plastic radiator tanks. The oil in the plastic
gets bleached out and then it shrinks in size and turns very brittle, finally degrading to dust.
--
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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