look under cover for the fuse boxes and you should see Fan 1, Fan 2, and Fan 3 called out. Those will tell you which relays are for the coolant fans.
A temp sensor
open your hood, locate the radiator, its on the left hand side at the bottom of the radiator, its pupose is to close the circuit when the coolant get above normal and turn on the cooling fans.
SHould be under the hood in a black box labeled FAN
What do you mean by ``switch``? Coolant temp sensor could be bad, Fan relay could be bad, or fans could be bad. Is radiator completely full? An air pocket could cause problems. By switch I mean the temp sensor located on the radiator itself. I have put direct voltage to the fans and they operate. The radiator is new and full of antifreeze. On this particular model there are two boxes with relays and fuses under the hood on the driver's side. Box that is closest to the headlight has one relay listed as fan no1 and the other box has relays listed as fan no2 and fan no3. Which one of these operates the radiator cooling fans? Is there a way to test these relays? Does engine have another sensor near thermostat housing? This is normally the one that controls the fans. Either way, if sensor has one wire to it , disconnect it and ground it to engine with ignition on. fans should run. If not, it is probably a relay. If you have air conditioning, the fans will both run when you turn on the air conditioner with the engine running. (At least the 1998 Camry is this way). Both fans run to keep airflow over the condenser coils. If both fans run this way, then wiring, relays, etc. can be assumed to be alright. Then more than likely, your problem is the radiator temperature switch (you will see wires going to a device that is screwed into the radiator near the bottom, by the lower radiator hose) This switch should turn on the fan when the radiator fluid gets hot. I am not sure this fan will run when the car is turned off but at least you know the wiring and the fans themselves are operational.
Most likely you have overheating, that's why the keeps running. You need to check the temperature control sensor and the thermostat.
some vehicles have 2 fans, one for when the air is kicked on and the other fan for normal driving so there is 2 switches.
It controls , example the regulator controls the fans speed.
I am not sure what a "fan sannor" is. If you are talking about the sensor that controls the cooling fans, I believe it is threads into the lower radiator tank. Look for the wires.
yes
Real easy if it's a 4-cyl. Drain the fluid, remove the hoses, take out the radiator fans, unbolt the little puppy and lift it out. Not sure - go to a junk yard and practice on one in the yard. It's a great place to learn how to do a lot of jobs...
The Sensor for the fans is located on the upper right side of the radiator, ( the Passenger side).
120$