I think I would check the fan first by putting 12 volts on the connector directly. Then work your way back to that relay with those fragile yellow/ gray wires- I’ve had trouble with those in one of my 1999s and I think it’s the same on the early p80s

Anyone nearby for moral support?

not sure if this is similar to early 855 na 94 but the coolant temp sensor sends signal to ecu which sends signal to fan relay and mine had same symptom also gauge reading normal but engine overheat and regurgatating i changed sensor and ran engine without cap on till thermo opens then squeeze the r...