Previa rear ac switch won't turn on. relay, resistor and all fuses ok.

Yes there are two fuses and there are relays in the blower motor resistor assembly ! One fuse is located in the under hood fuse / relay box marked RR HVAC Fuse #21 30A Rear Heater, Rear Blower Relays. The other is located in the left Instrument panel fuse block marked IGN 3 10 amp. Fuse # 2. The Blower Motor Resistor Assembly - Auxiliary is In the right rear side panel above the wheel well ! The Fuse Block -Left I/P is On the lower left side of the I/P.Fuse Block - Underhood At the left side of the engine compartment near the battery .

Power goes thru the rear blower relay, then the resistor and motor. The fan control switch provides the ground connection. I would check the rear blower relay if power is questioned at the blower motor.

I'm going to start from the beginning.
The blower motor gets power from the high blower relay and it is grounded thru the fan switch and the resistor. So you should have power on the pink white blower wire coming from the high relay to the blower motor. The orange black wire from the motor is ground going to the resistor and fan switch. The blue wires on the control panel are for the ac compressor.
The high blower relay gets power from fuse number 5 in the box. The blower motor is grounded thru the resistor and then thru the fan switch.
Photo courtesy of AutoZone.com

Could be the blower motor relay, the control panel on the dash, or the resistor.
You would need to check the blower motor for power and ground then work back to the fuse. I think the relay is in the box near the battery.

faulty connection ,or check all your fuses from box,check fog lights fuse 1st,

Could be a fuse, blower relay, resistor, control switch, or a wiring problem.
The resistor should be behind the glove box or on the firewall.

First check the 15 amp HVAC fuse located in the main fuse block inside the car on the passenger side of the center console, under a cover. If the fuse is good, then the problem may either be the HVAC blower switch (which is the fan blower selector switch), the fan blower motor resistor, or the fan blower motor. An auto repair manual will explain and illustrate for you the steps on how to check each of these components.

Even after pushing the ac light switch on, the fan blower selector switch has to be turned on as well (working) because it provides an electrical path to the positive side of the battery to complete the circuit and turn the ac light on. What the ac light switch does is provide the electrical path for the ac compressor clutch to come on through the ac control relay which is controlled by the car's PCM(computer) when you want ac, but the ac light switch still needs to run through the fan blower selector switch to receive its power. You can turn on the fan without the ac light switch because it gets its ground path(negative) from the blower motor. So the blower motor has to work in order to provide a ground path for the fan blower selector switch to be functional. You could have a faulty blower motor which is why no air blows through the vents. The fan blower motor is located inside the car on the passenger side underneath the dash at the bottom end of the glove compartment box. You'll see it. It's right above where a person rests their feet on the floor. Therefore, if your 15 amp HVAC fuse is good, check to see if you have voltage at the blower motor connector. Unclip the connector and with the ignition on and the fan blower switch moved to any one of the first 3 selections, check for voltage using a multimeter. The voltage will vary because there is a blower motor resistor. Voltage should be higher on setting 3 than 1. If you do have voltage at the blower motor connector, check for a faulty blower motor. The auto repair manual will tell you how to do it using jumper wires.

It's normal that your car is running hot because the radiator fan works in conjunction with your ac compressor. If the ac is on, the radiator fan will be on and therefore the engine coolant temperature will stay in it's normal operating range. If the ac is off, the radiator fan will stay off as well and the engine coolant temperature gauge will begin to rise and show pretty hot (especially at idle). It will do this up until a certain degree then the radiator fan should turn on thermostatically and stabilize the temperature. It's scary and I know what your saying because it does that to my car if my ac isn't on. Don't worry it won't overheat.

COULD BE FAULTY BLOWER MOTOR RELAY OR FUSE.THE BLOWER MOTOR COULD BE FAULTY.

Check the fuse again. You probably overlooked it.

blower motor bad or ac clutch bad,,check blower resister as well,it is in the blower box ,blower motor is the most comon to do this