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It sound like the heat and AC dash switch control unit has developed a short and effectively fused some contacts together.
The danger is that electrical shorts have the possibility of starting a fire.
The electrical circuit can be disconnected by removing the heater and AC fuses from the fuse box.
the ac fan starts as soon as the ac is switched on
the fan is provide cooling of the condenser before the radiator to prevent high head pressures in the ac compressor
it is the fan at the front of the car mand does not affect engine temp
there is a radiator fan between the engine and the radiator that will not start until the coolant temperature reaches a set temp at which point the ECM switches that fan on
if that fan is not working when the engine is hot , check for fan, coolant temperature sensor switch , fan relay, fuses or problem ECM
if your engine is overheating could be the problem of the ac not working , check the temperature sending unit located by thermostat housing , if it is bad will not let the radiator fan come on when ac is on and will cause your high side pressure ac line to get to hot causing the high side switch to disable the fan , also check the blower motor resistor it controls speed of blower motor
Not sure what fuse or fuses you have replaced. I know there is a fuse marked BLWR in the fuse panel under the hood but the is also another fuse that is a vital part dealing with the blower motor working. Above in the second picture is the fuse layout in the fuse panel inside the truck. I marked the fuse you need to check (HTR A/C). If that fuse is good then you need to check where your power loss is. In the first picture above, that is one of the connectors on the control panel (power control switch &if you have a manual control not auto). The terminal marked with an arrow you need to chaeck for power at that terminal (Should be a brown wire. If no power, find the open wire from there to the HTR A/C fuse. If your good there you can make sure your getting power to the blower motor. Not sure of the wire color but it's the one that's not black. Make sure you have power there with the switch on. remember to use a seperate ground and not the other wire (the black one) on the connector at the blower motor. If no power the find the open wire from there to the replay. If all is good then there's much more tracing but I would start here. Hope it's just that other fuse. Hope this helps....
Go to the fuse block and check 15A fuse D which feeds power to the blower motor. Then check 10A fuse K which feeds power to the blower relay and the fan (blower) speed select relays. If the fuses check OK, the blower relay, the fan switch or the speed control relays may be defective. also, the fan speed resistor may be defective
if engine at long stand still,the engine temperature will rise about 190 degrees the cooling fan suppose to automaticaly turn on when coolant temperature sensor get hot it cause its resistance decrease causing pcm to send power to coolant fan relays and cooling fans, when you turn on AC the cooling fans suppose to turn on to cool down AC CONDENSOR, IF NOT AC WONT WORK COOLING FAN COOLS DOWN REFRIGERANT SO IT CAN RECYCLE THROUGH THE SYSTEM AGAIN.your cooling is suppose to turn on when engine at a sit still if vechicle not moving as coolant temperature rises at a set point the cooling fans will turn on cool down engine.cooling fans dont turn on when you first cold stsrt vechicle unless you have AC SWITCH ON.if cooling fans dont turn on when vechicle at a long stand still or moving along slow traffic.if coolant temperature sensor been replaced and fuses and relays okay have dealership check see if pcm driver circuit working faulty pcm will cause cooling fans not to turn on.
WELL TURN ON AC MAX COLD HIGH TO SEE IF COOLANT FANS TURN ON.IF NOT YOUR REFRIGERANT SO LOW THAT THE AC REFRIGERANT PRESSURE SENSOR WONT CLOSE CIRCUIT TO TURN ON COOLING FANS.MEANING YOU NEED HAVE AC CHECKED AND CHARGED.ALSO CHECK COMPRESSOR FOR POWER IF NOT YOU HAVE BLOWED FUSE OR BAD RELAY.IF FUSE AND RELAY GOOD YOUR AC COMPRESSOR CLUTCH COIL OPEN OR THE AC CONTROL SWITCH IS BAD.IF COMPRESSOR IS RUNNING WHEN YOU TURN ON AC YOUR AIR TEMPERATURE ACTUATOR NOT WORKING.
that seems to be the problem. If the fan does not turn on when the a/c is turned on it could be a fuse, relay, control box, or just a bad fan. Try connecting the fan directly to see if it works. Does this car have 2 fans? normally all the small cars have 2 fans one for the engine cooling and one to assist the first when the a/c is turned on. Without the fan pulling air through the a/c condensor the had pressure goes up high enough to shut off the a/c compressor. It also causes some cars to run warmer than usual when stopped. Check the a/c condensor for blockage also which doesn't have anything to do with your fan not working.