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Old 07-10-2005, 04:41 PM   #1 (permalink)
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I'm not sure if this is a common problem or something unusual with this car. The car is a 92 525I.

The AC/Heater blower fan works fine on all speeds since i can hear it. But get very little air through any of the vents, no way for it to keep me cool in 80F+ weather.

Is this an easy fix? I read somewhere that the AC/Heater filter needs to be changed annualy for the air to pass through the vents correctly, that true?

If so, where is this filter and is it easy to get to?

The person i bought this from seemed highly unlikely to have changed this, but please let me know if there could be any other causes for this.
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Old 07-10-2005, 04:47 PM   #2 (permalink)
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I agree that you most likely have a clogged AC microfilter. Its located in the front of the heater case. You must remove the glovebox to access it. Its a medium skill level job. I did a quick google search and came up with this for you. It has instructions and a picture.

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e34 MICROFILTER replacement
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Old 07-10-2005, 07:33 PM   #3 (permalink)
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Yay, that was definately the problem for not having hardly any air coming through the vents.

That vent was caked upon caked of dirt/dust, i don't think it ever was changed. Now it blows really well.

Now another question. Does this car have a climate control where it slows how powerful the cold is of the ac when you slow down? Also it doesn't get that cold when i get moving on the road, are these cars known for weak ac strenght?
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Old 07-10-2005, 08:04 PM   #4 (permalink)
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they don't have the strongest ac out there, but they'll cool u off just fine after a couple of minutes.

as for the slowing down/speeding up -- i didnt notice any change when i stop/go.
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Old 07-10-2005, 08:07 PM   #5 (permalink)
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Hm, so is there anything else i can replace, expansive valve, ambiant temp. sensor ect. that may increase the coldness of it?
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Old 07-11-2005, 12:19 AM   #6 (permalink)
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before you replace anything have the system checked to see if it needs refridgerant. If it is full and still doesnt blow well then you would want to check the system pressure for clues as to what the failing component is rather than just guessing.

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