The A/C light goes on when I turn it on (speed 1) and I can feel cool air comming but when I turn it to the speed to 2,3 or 4 the fan speed is higher but the A/C light turns off and only regular air comes
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Re: Air conditioner not working
You have a problem with your switch. the contact for the compressor is making only at speed 1 and goes off when you choose 2 to 4. trace the wires that went to your switch and if you have an ohmeter, you will find 6 wires comes out of the switch, one for the source, four for the speed if you have four speed and last for the compressor. check first if you can identify the common wire and chk continuity from the common wire to number 1 ,2,3 and 4. then chk the last wire which is the compressor that it should have continuity all the while from 1 to 4. if it has only at 1 and not to 2,3 and 4. then there is your problem, if you can open up the switch, then it may need contacts cleaning or contacts repair. i hope i was able to help.
anothere thing, try to wiggle the handle of the switch and observe if the copmressor would run as you wiggle it. this would even support my theory that you have a broken switch.
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Because the first three speeds are not going through the same power feed configuration. You can check the speed switch but I do not think that is it. Kind of hard to fathom three contacts all going bad at same time.
Rather you might want to check the schematic and you might discover that the first three speeds of the blower go through a special circuit powered by your car's ignition switch!!! If that part of the ignition switch goes it affects your ac blower - and don't be surprised if your rear lights and some other stuff is not working also!!!!!
On some vehicles the switch is called the blower motor resistor. There is some confusion about whether you are missing fan speed or the A/C chilling the air.
For the chilling part, this is controlled by 2 pressure sensors in the system called a low pressure switch and a high pressure switch. The rpm of the engine can affect when stuff begins to work and when it cuts out. There is a correct amount of Freon needed for every system. The engine rpm contributes to the available amount of pressure in the Freon system. This is why some things are different from start-up to when the car is moving.
You need to do a pressure check for the Freon in the system. This can help indicate if a pressure switch is cutting off cooling power. For the fan speed, it is the blower motor resistor, a troublesome switch that has lagged behind technical improvements.
So you have 2 answers-1 for fan speed and the other about cooling functions. You can fix either separately as half the system can be good and the bad half is stopping all of it from cooling the car. Hope this helps
when it's on 'auto', the fan adjusts according to the temp in the car and the temp setting you have it set at. try setting the auto temp control down to 65, then hit the "-" one more time to send it to "LO" - the fan should automatically jump up to max.
1. check your refrigerant pressure and if the reading is below 20 psi then ur gas is less
2. locate low pressure service port that reads L
3. start engine/ turn ac on
3. recharge gas to max pressure between 20 and 40 psi max.
4. feel the low pressure line if its cooling while ac is running...the job is done...
If there is air moving through the vents most likely the final stage transistor(blower resistor) has failed. It controls blower speed from a signal from the ihka (a/c control panel). the final stage receives the signal from the ihka of the drivers preference blower speed. the final stage pwm (pulse width modulates) the blower motor. which means it turns it off and on very quickly to speed up or slow down the blower motor speed. It isn't the easiest part to replace. Usually at a dealership i would expect to pay somewhere around $600 (including diagnosis)but don't hold me to it. bmw dealerships stand behind their repairs and usually include a warranty with the part of 2 years unlimited mileage.
it sounds like you have a blend door problem. This is located in the HVAC sysem it closes a door from cold side to hot side. sounds like a bad servo motor or a vacuum leake on that motor. Hope this helps you, please rank this solution