Why does my fuse for the radiator fan keep blowing

check what fuse is blowing
I suspect that it is a fuse for the fan relay that switches on the radiator fan
if that is the case , replace that relay
the reasoning is this
there is a fuse for the coolant temp sensor
that sensor reads the coolant temp and reports to the ECM so that the air/fuel mixture can be adjusted correctly
there is a second fuse for the control for the fan relay
when the coolant temp reaches a set temp , the ECM through that second fuse energizes the fan relay which starts the fan to cool the radiator
from your description , the short is in that system and so I suspect the relay is faulty
take it to an accredited auto electrical specialist for a diagnosis of the fault

If you had a 5 amp fuse and fan draws 3 amps all is good.
BUT, if there is a short circuit before the fan, it will blow the fuse.
Check the wiring is not chaffed or worn between fuse box and fan, or switch to fan.

Unplug the radiator fan, replace the fuse and see if it blows again. If not, then its likely the radiator fan is shorted. Use an ohm meter and see what the resistance is. It should be greater than 5 ohms.

Most likely fan motor over load. Recommend replace and recheck.

It's difficult to say exactly, but I would check the wiring harness(es) around the area of components you removed during the radiator and fan replacements. It sounds as though a wire or wires were pinched during reassembly.

Disconnect the fan motor and see if the fuse still blows, if it doesn't you may have found the problem and the fan needs to be rep[laced a 30 minute job just a few bolts..

The radiator fan has a short in it,and it is going out,replace the fan motor.

the relays will not cause fuses to blow. you have a problem with the fan motor itself. replace that it should take care of your problem.

You either have a short in the wiring, or the fans are bad. If you unplug the fans, does the fuse still blow? If not, you need the fans replaced. If so, you have a short in the wiring somewhere.

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