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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 06-15-2017, 08:35 PM
cesar13vazquez cesar13vazquez is offline
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Mein Auto: 325i Sedan
Ac issue.

Ok guys I'm new with cars in general. Last night my car AC stopped working all of a sudden. I can't say that he didn't give me any warnings because before you completely went out on me one side which was a passenger side will blow hot. The driver side would blow cold. Then like I said it just stopped I Mabel to move the fan controls up and down but nothing seem to be working. Then today about 15 minutes ago on my way home I test it out and give it a go and it turned on. I don't hear a humming noise coming from the dashboard which I assume is the blower however before I spend money trying to replace the blower or the resister I need to know you this is a resistor issue or a blower issue I did smell some kind of burnt smell coming out of the vents before he went out and just now that it came back on I do see however that the AC will fluctuate low and fast at first. Now is on full blast.


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  #2  
Old 06-16-2017, 04:34 AM
marcozandrini marcozandrini is offline
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It's likely that the AC system is low on refrigerant, R134a. The climate control won't engage the compressor clutch when the refrigerant charge is below a specific pressure.
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Old 06-16-2017, 08:14 AM
cesar13vazquez cesar13vazquez is offline
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I bought a canister with a gauge and the pressure is fine. It was weird it started up in the middle of the road after messing with the circulation option a few times.


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Old 06-16-2017, 08:22 AM
marcozandrini marcozandrini is offline
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Quote:
Originally Posted by cesar13vazquez View Post
I bought a canister with a gauge and the pressure is fine. It was weird it started up in the middle of the road after messing with the circulation option a few times.


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Those cans of refrigerant and a gauge are useless. Your system has all the signs of low refrigerant, including the cool/cold on the driver's side and warm/hot on the passenger's side. That's how the system is designed to work when it's low on refrigerant.
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Old 06-16-2017, 10:16 PM
Y2K_Bimmer Y2K_Bimmer is offline
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I had a similar issue. Cool on the driver side, not so cool for the passenger. I was virtually out of refrigerant. I had the system tested and refilled. Chilly here in Phoenix since having it done.
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Old 06-17-2017, 12:03 AM
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Fast Bob Fast Bob is offline
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Have an HVAC-savvy tech put some real gauges on your system to get a true picture of what`s needed.
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Old 06-18-2017, 03:52 PM
cesar13vazquez cesar13vazquez is offline
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Alright guys. Thanks. The only thing I was concerned with was with the humming noise coming after I put full blast. And the speed fluctuations.


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