First point of call is to get your car scanned and see what codes come up if any. Also find the relay for the fans and see if it is faulty. They are mostly all the same and can often be interchanged. Find a non critical one like the Horn or headlight relay and swap it out with the fan relay. If that works it is your relay and then you just buy one that is the same.
With your engine running and you have your interior fan lever/switch on does it blow air on all positions? As sometimes that switch can fail.
Assuming it is working. Interior fan all the way on, AC on. Engine on, in neutral or park handbrake/Ebrake on.
Engine at operating temperature. Where is the temp gauge sitting, in the middle way under or way over the middle position? Lift bonnet/hood then check and see if fans are running, both should be. Do not assume because they aren't that your fans are bad. It could be a temp sensor failure.
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