Fan works ok blows cool air thermastat is ok

you changed the thermo switch and relays and it didnt fix it
did you test the fan motor itself

the fuse box cover should have a fuse layout diagram
engine cooling fan

look for a 30 amp fuse

they usually near the fan relays

is the air con cooling fan working with air con on
and engine running

The cooling fan motor is likely drawing to much current because it is worn out.

The very first thing you need to do is to check for fuses or say faulty fuse. Secondly check fan which starts along with air conditioner, it might be manually switched off or the fan may have been clogged. Also reason can be lack of refrigerant - charge your air conditioner with refrigerant. Last thing you need to check is cooling coil - the cooling coil may freeze if there is no refrigerant in the system.

Assuming the engine is ok, no leaking head gasket or exhaust problem, you need to know if the radiator fan comes on when the engine reaches 225 degrees. It should also come on when you turn the ac on if the ac works.
Its also possible you have air in the cooling system.

the system may be clogged up somewhere, flush out system good. then put anti-freeze back in and then change the coolant temperature sensor, also change the thermastat. good-luck!!

Check to see if your electric cooling fan is working when the vehicle is in park with the engine and a/c running. If the fan isn't running then the a/c won't be able to blow cool air as it can't get rid of the heat through the condensor which is located ahead of the radiator. When you are driving over about 35 mph there is enough air being forced through the condensor and radiator to get rid of the heat and the a/c will start cooling properly again. If the fan isn't running and you sit with the car idling long enough [such as in heavy traffic] then the engine may overheat as it also has no way of cooling if the fan isn't working. Usually this fan is powerd by a 30 amp Maxi fuse but each model is a bit different. Your owners manual should have an illistration of the fuses and what they power. Good luck, hope this helps a bit!

it sounds like the thermastat needs replacing .it might be worn .so it is not closing .check the heater hoses .if they both are hot the heater core is blocked

The fan may run with jumper wires but if it''s blowing the 30 Amp Maxifuse it's needs a new or used fan motor.It's pulling too many amps.I have almost never seen a fan relay concern.Only other thing you may check is the wiring down near the fan shoud I have seen the 2 wires get loose from the conduit & melt onto exhaust manifold.Hope tHis Helps

Check the fluid level in the radiator - after it cools down !

It sounds like you should replace the temperature sensor that controls the fan. This is usually located in the radiator and has electrical wires connected to it. Trace the wires from the radiator fan ( not the air conditioner fan!) to the sensor.

If the radiator is aluminum you may need special anti-freeze to prevent damage.

Have you Checked the Fan Clutch?