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08 Boxster ac compressor

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Hi All, Ac wasn't working few months back clutch wasn't engaging...I thought because of a leak and low refrigerant. Replaced an ac pipe, receiver dryer and expansion valve. Pulled vacuum and charged, was working...could have been cooler. That was during the winter in the garage ( northeast). Now suddenly its blowing a B10 25A fuse. Disconnected the compressor wire figuring it was the compressor but it's still blowing fuses. Thoughts? Thanks V

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B10 is the fuse for the AC clutch, amongst other circuits (InstrumenCluster Diagnosis Mirror Adjustment (to 1997)Headlight Vertical Aim Control (from 1999)ALWR (from 2001)Parking Assistant (from 2001)

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Posted (edited)

Ok what do I do?😁

I already disconnected the compressor wire but it still blew. The hvac controller goes out as well w the blown fuse. 

Edited by vza
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Posted (edited)

Umm.....not too sure where to start. Tested the ohms on the compressor clutch it was 3.5ish which i think is in the good range.

The AC relay I think is in the back trunk, slot #1? What next? V

Edited by Vincent Venezia
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You need to be testing total amperage draw on the circuits; for that, I use what is called a DC "clamp" meter that senses the draw on an active circuit, it simply clamps around the wire under test and shows you how much current (amps) is being pulled:



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  • 2 weeks later...

I figured I would disconnect associated components to find which is the bad one...since I'm not too inclined to find wires to test amps. I swapped the ac relay w new one thats located in left rear trunk, disconnected cooling fan control module, disconnected ac low press switch and ac compressor. Head unit remained on and was able to activate all switches.  Fuse began blowing when I plugged the low pressure switch in. Not sure what that means...don't think it's the switch I think it just supplies 12v to the compressor and the compressor does go on(clutch engages) when it's plugged in but then immediately blows a fuse which makes me think it's the compressor. After that I checked resistance on ac clutch coil by putting a meter between wire coming off compressor and ground I got over 8 ohms which is out of spec. Thoughts? V

Edited by vza
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