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General E46 Forum
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Old 06-07-2011, 10:59 PM   #1
DTRP03
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Join Date: Jun 2009
Location: Boston
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My Ride: 330i
a/c problem

i have a 2003 330i bmw and my ac worked perfectly fine in summer. went through the winter and then summer came and nothing it would not work. i took to a shop to recharge it and see if there is a leak or it is low. the test came up fine. plenty of pressure and no leaks. the pump is not turning on. so i checked the 3 fuses in the glove box and there all good. can the clutch be seized up from not being used or is this something that is just bad and i need a new pump.??? need help its 90 degrees here and i have black leather lol not good when your girl wheres a skirt. lol
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Old 06-07-2011, 11:12 PM   #2
jgold47
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Quote:
Originally Posted by DTRP03 View Post
i have a 2003 330i bmw and my ac worked perfectly fine in summer. went through the winter and then summer came and nothing it would not work. i took to a shop to recharge it and see if there is a leak or it is low. the test came up fine. plenty of pressure and no leaks. the pump is not turning on. so i checked the 3 fuses in the glove box and there all good. can the clutch be seized up from not being used or is this something that is just bad and i need a new pump.??? need help its 90 degrees here and i have black leather lol not good when your girl wheres a skirt. lol
if they pressure tested and said you had pressure, no leaks, full freon charge, but its still not turning on (I assume the snowflake is lit, the dial on the upper dash is set to blue, etc...) then your compressor may be shot. There is away you can supposedly tell if the clutch is gone, but I am not sure how easy this is to do, but basically with everything on and running you look at the front of the compressor and see if the center of the pulley is turning with the belt or if its just freewheeling.

good luck
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Old 06-07-2011, 11:49 PM   #3
rowdy lee
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normally

that would work but there is a bunch of electronics between the snowflake symbol being lit-up and
the voltage eventually sent to the electromagnetic clutch.

If it was me, I might try looking thru the electronic schematics
and see what ... there is the climate control computer, there is some inter-function with the electric engine cooling fan (if it's a manual), and whatever else.
In the manual, there may be a testing ladder; if this works, proceed to step... whatever, and so-on.

You might find the connector for Voltage to the clutch, attach secure jumpers to a VOM and see if you ever get V to the compressor clutch. Vacuum cleaner the sensing slots on the dash for the cabin temp. sensor, I think.

Could find out what fuse does what and check for voltage there when you switch different climate function buttons around...

Can take those wires to the clutch and use the ohmmeter function on the VOM to check if the coil has continuity... (maybe there is a tone function on the vom)... easy to do. If the electromagnetic coil wiring is broken or shorted, that would be something to find...

I think I remember some of this stuff...

Gee, I dunno. Keep at it & get some sauce for those thighs.

I assume that the cabin air distribution fan/blower is ok? Holds speed, no on-off by itself, etc. etc.
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Last edited by rowdy lee; 06-07-2011 at 11:59 PM. Reason: add
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