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Hiiiiiiiiiiii i have a nissan tida2007 model car.frequently AC not working , ac switch not working no light on the switch . blower fan is working but compressot not working . i just change pressure switch and check all fuses , relays and gas . so please find A Solution
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blower motors have nothing to do with ac systems
the controllers of the ac are
high pressure switch
low pressure switch
thermostat
fan switch
compressor relay
wires and connections
ac clutch coil
If it is not working , then there is every possibility that there is no gas in the system
have a professional ac fitter properly diagnose the fault
If the blower worked, but couldn't get cold air, there may be a leak of refrigerant in the A/C system. If you're complaint is about the lack fan-forced air; that could be a problem with the fan speed switch or a bunch of other places. Most often however, it is the speed control resistor. Have a look at this thread to learn more about it:
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.
Yes I would highl suspect is the blower resistor. Try the fan without the AC and see if it blows only on high or on other settings. If it is similar to the when you have the AC on, then it is the blower resistor that needs to installed.
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