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Re: power to a/c unit
If theres power to all the sensors and to the compressor and it has been re-gased with the correct amount of gas then provide a 12v suply to the compressor to see if the clutch works if this fails the coil in the compressor is proberly faulty
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the belt driven aircondisioning unit is located under the hood. there are usualy metal lines coming off of it and one should have a valve in it ...looks like a tire,air valve. when car is running, turn the AC on. the unit has a two part clutch that the belt will turn. when the AC is off...the pump or compressor will engage and the hole belt driven piece will rotate when the AC button is on. , when it is off....or not getting power to the clutch , the pully will spinn but the inside clutch will not.
iff the unit engages and turns when the AC is turned on, and still blows hot air, then you may have a leak in your refrigerant line. iff it dosnt engage, then check your fuses .if everything is good to go..then it is mostlikly a vacume issue located in the dash behind the AC switch and display that moves the vent from hot to cold....
could be a problem with the heater controls ,or you do not have the right machine to recharge the vehicle properly with R134 ,the vehicle needs to have the system reclaimed then oil recovery and then a vacumn before the oil is added and the gas by weight.For this you need a special machine
I would check the following possibilities: 1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.
2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.
Could be other issues, but I would start with these.
start car.turn on air conditioner high cool .raise hood look to see if the compressor clutch is engaged and running.if yes your ac air door could be stuck closed or the air door vacuum actutator not receiving vacuum.a vacuum line is broken or off. or the control switch bad.that control the AC and heater mode. if compressor clutch is not engagged.check for power at compressor clutch.if yes compressor clutch coil open. or the air conditioner refrigerant R 134 is low take car to a private garage with a good reputation. they wont be expensive as the dealership.have them hook car air conditioner to a manifold gauge set to check your refrigerant low side and high side pressure.