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Old 05-14-2012, 04:06 PM   #1
kakashi169
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ac problem

ac blows warm air out...went to RMP and refilled it with freon...still warm air

i suspect a leak some where??

any ideas?

thanks!
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Old 05-14-2012, 09:01 PM   #2
Jon325i
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My E46 is doing the same thing.

I've got to get it looked at. Didn't RMP diagnose the problem before filling it with refrigerant?
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Old 05-14-2012, 11:03 PM   #3
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RMP didn't diagnose the problem because they aren't licensed a/c technicians. Your system is now contaminated with RED TEK and no shop will touch it. You should've brought it to a licensed technician and had it done properly.
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Old 05-15-2012, 02:14 PM   #4
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okay so is there a solution to this?
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Old 05-15-2012, 04:24 PM   #5
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Originally Posted by kakashi169 View Post
okay so is there a solution to this?
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Old 05-15-2012, 05:18 PM   #6
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Probably your Front Stage Resistor, or your outside air temperature sensor.

If the FSR is defective, the AC and fan might work sometimes or generally in "waves".
If the OAT is faulty and the car thinks it is -40 outside, the AC will never engage because it thinks the outside air is cool enough.

Buy the BMW Scanner 1.4 from xcar360.com and scan your modules. Best $32 you will ever spend.
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Old 05-15-2012, 05:23 PM   #7
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Originally Posted by ac_2007 View Post
Probably your Front Stage Resistor, or your outside air temperature sensor.

If the FSR is defective, the AC and fan might work sometimes or generally in "waves".
If the OAT is faulty and the car thinks it is -40 outside, the AC will never engage because it thinks the outside air is cool enough.

Buy the BMW Scanner 1.4 from xcar360.com and scan your modules. Best $32 you will ever spend.
sup ac2007..met u at the meet..

do u happen to have one on hand that u can check for me?

i replaced my outside temp sensor last week at RMP alrdy..so it aint that
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Old 05-16-2012, 06:10 PM   #8
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sup ac2007..met u at the meet..

do u happen to have one on hand that u can check for me?

i replaced my outside temp sensor last week at RMP alrdy..so it aint that
Did you? Remind me again who you are lol.

It is true that the AC won't engage if the refrigerant level is too high or low. What I can do is scan the AC and HVAC modules and you can see the errors for yourself.
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Old 05-24-2012, 12:34 PM   #9
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update*

ac problem fixed.

it was over charged with freon.

i had to go to a specialized shop and had it drained, vaccum pumped and refilled.
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Old 05-24-2012, 07:04 PM   #10
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I'm glad to hear it worked out.

I've got an appointment with the dealer on Monday to get mine looked at.

I can't wait for the bend over price.
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Old 07-15-2012, 03:28 PM   #11
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Which shop did you use, and what did they charge for the service? I need to take mine in and prefer to not use the dealership, and it sounds like RMP is not the right place to go (specifically for A/C service - they do great work otherwise).

Quote:
Originally Posted by kakashi169 View Post
update*

ac problem fixed.

it was over charged with freon.

i had to go to a specialized shop and had it drained, vaccum pumped and refilled.
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Old 07-15-2012, 05:37 PM   #12
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Originally Posted by kakashi169 View Post
update*

ac problem fixed.

it was over charged with freon.

i had to go to a specialized shop and had it drained, vaccum pumped and refilled.
EXACTLY what happened to me 'kept it wasn't RMP but a friend who overcharged the system.

Glad to hear you got it worked out!
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Old 05-16-2012, 12:46 AM   #13
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Originally Posted by kakashi169 View Post
ac blows warm air out...went to RMP and refilled it with freon...still warm air

i suspect a leak some where??

any ideas?

thanks!
1) Once RMP "topped up" the refrigerant, did the cold air start to come out from the vents?

2) If 1) is yes, and now hot air is blowing again then any leak big enough to empty the charge in a 24 hour period is typically visible/audible right away. You most likely have a hole in a condenser or one of the o-rings is busted. The best way would be to empty the system and pressure test it to figure out where the leak is.

3) If 1) is no then you probably have a different issue at hand. The first thing would be to hook up the gauges and see what the low/high pressures are. Assuming that low pressure is ok, you may have an issue with the pressure switch or the compressor clutch. If low pressure is low then it's back to step 2).

See if you can tell if the compressor kicks in when you turn A/C on. It is usually quite simple to see as the RPM might dip and you will hear the A/C clutch and relay engage as you press the A/C button. Also the electric fan should start around the same time. If the compressor starts working but the hot air still blowing from the vents, it is possible that the expansion valve is gone.

Ultimately, at this point in time you are probably better off taking the car to an A/C specialized shop who would be able to properly diagnose the problem.

BTW

The FSU (First Stage Unit aka Blower resistor) has nothing to do with your A/C. To my knowledge the outside temp sensor also has no effect on the operation of the A/C unit - the pressure switch is typically the only component that determines if the compressor is safe to run.
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Old 05-26-2012, 03:19 PM   #14
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man, ac problems are a B*&%#

Cant overcharge or undercharge the 134a, or the clutch on the compressor wont engage. The outside temperature sensor must be functioning or the wires jumped for the computer to register a temp high enough for clutch engagement also. Even with all that working, warm air still might come through if the water valve(located below and behind airbox) is stuck open, which is common on the e46.

It took me like a month to diagnose each individual component before I was able to fix mine....

A piece advice about recharging the AC yourself, bad idea. Those 12a / 134a kits with the gauge suck. They are not effective if you have existing air and moisture in the system.... I tried using it once and got quite a bit of the refrigerant into my system, however still was warm. Then went to a shop, vacuumed the whole system, and then filled properly with 134a to spec, air is freezing cold now. Also dont mix 12a and 134a as it can act like acid and damage your ac system

Last edited by Vinoth; 05-26-2012 at 03:23 PM.
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