Intermittent Cooling Fan or AC Operation Due to Bad Ground on Plymouth Voyager

Problem Description and Possible Solution

A bad ground on the left frame rail can cause intermittent operation of the radiator cooling fans or AC compressor.

Problem Data
RepairPal Verified
Average mileage: 200,000 (200,000–200,000)
2 model years affected: 1996, 1999
2 people reported this problem
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Radiator fans run intermittently, at over-temp.

Result is frequent overheating.

Side issue MIGHT be a contributor: Instruments are intermittent, as well. Sometimes no instruments, including the panel overhead's fuel remaining works. Other times the fuel and overhead work but not engine temp, tach or speedo.

Radiator fans are a big issue as there's no cure other than to shut down and add coolant after it's cooled, and hope that enough air passes the radiator (new) when under way - but sitting idling once warm will overheat every time when the fans don't come on.

I have a Haynes but I can find no reference to a heat-transfer relay attached to the lower left of the radiator; he said he previously had the same car and same problem; he just pulled the connector off, and, he sez, that defaults to always on for the fan connection. 2 + 2 doesn't make 4 for me here, but not only is he very knowledgeable, it's the same car he previously owned.

As I can find no mention of a heat-transfer (attached directly to the radiator) relay/switch, I can't try that workaround until I get it to a garage. Where (if it's there) do I find that relay, and, indeed, does it default to 'on' when the ignition switch is on?