Cooling fan turns on when car is in acc mode. I have a 2000 Toyota Camry. What is wrong?

Likely somebody didn't hook up the fan(s) properly when the radiator was replaced.. OR ... hopefully, this wasn't a case where the original problem with the car was the cooling fans not working.... and somebody diagnosed the problem as a clogged radiator????? I had the same problem recently with the fans not working, and the problem was a relay switch that turned on the fans when more cooling was needed.....

yes it can but it could also be other things.Make sure you have enough coolant in it.You can make sure your engine cooling fan is working.

Take the car to a repair shop
Don't throw more parts at it
if you don't understand the vehicle
& how to test it & have wiring diagrams
for all vehicle diagnostics

Check fans work [jump w/12volt] Check fan relay for power coming in from ecu. this is your computer

It's probably got a leaf or some type of debris in the fan housing.

my 2000 camry also shakes when idling. Looks like the radiator fan is culprit, but havent had time to change out yet. looks like old blades on fan broke off making it unbalanced when spinning to cool off causing excessive shaking. When driving its cool enough where that particular fan motor does not need to spin, therefore no shaking. possible solution is replace the fan that is wobbling.

For many of the 90's and 2000's Toyota various models - Camry, Tacoma, 4 Runners, Corolla, and some other models overheating is usually caused by temperature sensitive fan switch on the radiator not operating. Electric fan on the radiator should operate when temp above 200 degrees. Less often the control relay 90987-03003 is defective. Check if bubbling in the radiator smells like exhaust. That would indicate a blown head gasket. A jumper wire from your marker light positive to the lower contact in the fan control relay socket will operate your fan when parking lights are on. The larger vehicles with more powerful radiator fans will need a hefty jumper from a headlight positive to avoid overheating the lighting wiring. Make sure the engine is off and warmed up to check the radiator core with your hand to see if it is getting circulation. If it is all cold the thermostat might be stuck.

The cooling fan is controlled by a temp switch in the bottom of the radiator, try6 replacing this switch.

Here is how to test if you have a bad cooling fan. Start the car, turn the ac button on. both cooling fans should kick on, if one doesnt then the fan motor has gone out on you. easy fix, your local parts store will have replacement.

Is your AC on (AC compressor activated)? Try switching that off and see if it still runs.