A/C 02 Saturn L 300

Tiny
YUKON JOE
  • MEMBER
  • 2002 SATURN L300
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 93,000 MILES
I have an 02 saturn L 300 and the a/c wont work, the charge is about 110 psi so it should work. The a/c fuse in the box under the hood keeps blowing real quick as soon as you turn it on or plug in the pressure switch in the line. I checked the power at the a/c fuse location and its 12 v or a lil more and the other side reads -0.02?
Saturday, June 4th, 2011 AT 5:43 PM

41 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
If the fuse is blown those are the reading you will get. Try unplugging the a/c compressor and turning the a/c on with everything else plugged in and see if the fuse blow's/Let me know what you find.
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Sunday, June 5th, 2011 AT 12:54 AM
Tiny
YUKON JOE
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Yes it still blows the fuse even with the compressor unpluged. If you unplug the pressure switch on the line it doesnt blow until you plug that in, but when you do like I said the fuse blows but the idle kicks up a little like it should even if the fuse is blown. I tried unplugging the fan in front of the air compressor thinking there was a short there but no difference either.
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Sunday, June 5th, 2011 AT 4:25 AM
Tiny
SATURNTECH9
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The fan for the a/c condensor is on a different fuse then the a/c fuse the a/c fuse is for the a/c compressor circuit only. When you plug the high pressure switch in it just sends power to the a/c compressor. You most likely have a wire going to the a/c compressor shorted to ground somewhere.
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Sunday, June 5th, 2011 AT 5:29 AM
Tiny
YUKON JOE
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Could that be a wire from the compressor to the fuse box and or a wire from the pressure switch to the fuse box and or the compressor since the switch sends power to the compressor? Sounds confusing I no but thats the only way I could think of asking that. Cause it dont blow till I plug the switch in remember?
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Sunday, June 5th, 2011 AT 6:50 AM
Tiny
SATURNTECH9
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Do you have auto climate control or manual a/c?
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Monday, June 6th, 2011 AT 3:05 AM
Tiny
YUKON JOE
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It is manual a/c.
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Monday, June 6th, 2011 AT 3:09 AM
Tiny
SATURNTECH9
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Alright remove the a/c fuse even unplug the pressure switch if it makes you feel better. Then get your ohm meter put it on 200 ohm scale put the black test lead to ground then unplug the a/c compressor and put the red lead to the green wire that goes to the a/c compressor. Let me know what the reading are?
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Monday, June 6th, 2011 AT 3:41 AM
Tiny
YUKON JOE
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Ok I will in the morning cause its midnight here now.
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Monday, June 6th, 2011 AT 4:02 AM
Tiny
YUKON JOE
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With the ohm meter set at 200 not 200k right? The reading is.8
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Monday, June 6th, 2011 AT 4:36 PM
Tiny
YUKON JOE
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I just also checked it with the key on and it read 13.7 and thats not volts its 200 ohm just like you said?
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Monday, June 6th, 2011 AT 4:46 PM
Tiny
SATURNTECH9
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Yes 200 ohm not 200K if you have.8 that is less then 1 ohm to ground on a power circuit to the a/c clutch there is your problem short to ground on that circuit like I was saying.
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Monday, June 6th, 2011 AT 8:26 PM
Tiny
YUKON JOE
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So your saying there is a short in that green wire that runs from the compressor? The black one is ok?Does that mean its the same wire that is in the fusebox that keeps blowing the fuse? And if I follow that green wire from the compressor I should find it grounded out shorted somewhere? Thanks for the help also what should the ohm reading be on that wire if all is ok?
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Monday, June 6th, 2011 AT 8:49 PM
Tiny
SATURNTECH9
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Yes that green wire supplies power to the a/c clutch if it's ground then when power passes thru the fuse and down that wire the fuse will pop because of a dead short to ground. There should be no path to ground on the wire. Look at the diagram I posted it show's the fuse sending power thru the switch contact side of the relay so when the relay is closed the fuse sends power thru the relay thru the fuse box and down that green wire to the a/c clutch. Most likely between the a/c clutch and the fuse box you will find a short to ground somewhere. The black wire is grounded as you can see.
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Tuesday, June 7th, 2011 AT 1:00 AM
Tiny
YUKON JOE
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Ok i'll keep working at it in the morning, so far I almost made it from the clutch to the fuse box stripping the tape an conduit I only got a little farther to go. If I dont find it before the fuse block then i'll have to take that apart to check the wire totaly right? Thanks I hope I find it soon.
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Tuesday, June 7th, 2011 AT 1:43 AM
Tiny
SATURNTECH9
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Yes there has to be a short somewhere causing the fuse to blow. Keep checking for that short to ground with the ohms meter also.
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Tuesday, June 7th, 2011 AT 2:45 AM
Tiny
YUKON JOE
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What should the reading be when the wire is not shorted? Would it be 1.0 or 0.00
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Tuesday, June 7th, 2011 AT 3:13 AM
Tiny
SATURNTECH9
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No it should read like the leads were never hooked up.
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Tuesday, June 7th, 2011 AT 3:37 AM
Tiny
YUKON JOE
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My meter starts out at 1. So is that what it should look like? Also the black lead from the air compressor reads.8 like the green one did does that mean anything?
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Tuesday, June 7th, 2011 AT 7:00 PM
Tiny
YUKON JOE
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I just got done stripping the wire harness from one side of the car to the other and found nothing? I cut the wire right were it goes into the fuse box and the reading was the same.8. The fuse box is hard to get apart to look at the underside but thats what I got to do now right?
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Tuesday, June 7th, 2011 AT 7:03 PM
Tiny
YUKON JOE
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I found no short at all where I looked. Could it be somewhere else? Its hot and I got 2 little kids thats why im trying to fix it any other help would be appreciated.
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Tuesday, June 7th, 2011 AT 9:42 PM

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