I have a 1992 corvette and the coolings fans do not work. I have bought a manual and find no solution to this or way to test in the manual. Is there a relay for the fans and where do I find it to test.

which fans coolant or interior check fuses relays and connections then test fan which ever one is problem and to find out what is what read owners manual and covers of fuse boxes

1984 1992 Corvette Service Bulletin Intermittent Transmission Downshift...

mcdevito75 here, At the relays wiggle the wires to see for loose connection, also see if you can jump the fan direct to the battery to see if the fan works., Also the fan relay could be bad, or the temp. Between the relays and fan there is a temp sensor that puts the fan on, jump that and see if the fan works.

This IS a Cooling FAN RELAY Failure for sure , I Would Also NOW Replace the Thermostat as Overheating is NOT Good for them.

OK, what you just said is that you checked and/or replaced items in the control system. Now what you need to do is find where the main power that the relay gets power from to transfer to the fan.(and a/c.) Likely a 30amp fuse or fusible link. I don't have that diagram but if you check the circuit that goes to the relay, it will be the heaviest wire going to it. (control system is low draw, actual power needs heavier wire to carry actual load)
If I read correctly, the relay is operating but no power is going to fan or a/c. If relay is not operating, then it could be a problem with the wiring going to the computer, or the computer itself, but computer problem is not very common.

The cooling fan relays are located on the upper radiator support in front of the left front wheelhouse.

you have 2 relays for your fan, primary and secondary
their controled by the PCM according to the temperature

Better check to see if the nuts are still tight on your fan.

Check to ensure that all the bolts holding the fan to the water pump are equally tight.

Do the fans come on when you turn on the air conditioner. I do believe the temp switch for the fan is on the passenger side of the engine above the starter.

there is a fusable link attached to the battery and there is a AMT fuse in the box in the car, that says ac/heat. (I think) You may have to replace your relay or some other part of the cooling system.
Another thing is to check your fan and see if it works by direct connecting it to the battery. HINT- test the fan in an upright position, like it sits in the vehicle.