Which fan motor relay ? Cooling (radiator) fan or the heater / A/C blower motor relay ? If talking about heater / A/C blower motor it doesn't have a relay . It's computer controlled .
Late 90 Cadillac No HVAC Blower Output
Might be the Resistor pack located close to the blower. It has a flat connector with 4 or 5 wires, and two small screws holding in the duct. It may be a crispy critter. It happens... The blower moves air across it to keep it cool. The blower motor may be bad as well, or possibly the fan speed switch. May very well be the fuse for the blower as well. The blower connector may be loose. Let me know what you find.
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