Car is running hot, fan not working,how can i fix the fan?

You may not be getting enough coolant to flow through you heater core. I worked on a car once where the core was badly calcified due to the owned using tap water as opposed to distilled water.

is the fuse and relay for the fan ok !! make sure the fans are ok, by jumping fan connector from positive on fan to positive on battery. negative on battery to negative on fan. if fan works it could be a bad coolant sensor, or a themostat thats stuck open, not allowing coolant to get hot and thats why the electric fans do not work. the coolant will not get hot enough if thermostat sticks open. it will by pass the thermostat and never get hot. have a good day !!

I had a similar problem. Is your temperature gauge pegged to the right as very hot? Or reads always cold, even when hot. If it is a 3100 motor their is a coolant temperature gauge sending unit under the air breather intake that is right next to where you replace the thermostat.

Get a haynes repair manual at a parts dealer, Amazon, or your public library.
On the Chevrolet Lumina, Monte Carlo, & Impala FWD 1995 to 2005 it's under section 3-8 on page 3-6. It goes into great detail, and it's too complicated to explain here. If your sensor is bad, but the wires and fuses are good then the fans won't run.

Your second fan only runs when the air compressor is turning, If your ac compressor is not running then the sensor will not have the passenger fan run.
You have to see if the fan motors are good and then the wiring is good, and no fuses blown. You might blow fuses so have extra blue ones if I remember right. Recheck fuses after testing.

replace the relay for it if the fan motors work hot wired direct

Never hot wire a cooling fan on a computer run car. Check the relays fuses and resistor connector in between the two fans. They usually melt the connector. I fixed mine with two female spade connectors

This is a front wheel drive car. The only way to fix this is to bring it into the shop or replace the fan. For a temporary fix if you turn the AC on it should automatically kick the fan on. Hope this helps

Fix the secondary fan.

Is the fan running or do you have an electric fan? If fan isnt running or never comes on no matter what you do it will never run much cooler. If fan is good then you could flush the radiator a couple of times and that will help but if fan isnt working it wont last long

Replace the sensor that controls the cooling fans.I recently had that same problem my fans were not working properly due to a bad sensor had it replace and have not had problems with car over heating are running hot.

check the coolant temp sensor