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#1 (permalink) Old 07-17-2011, 03:41 PM
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The a/c is blowing warm air, I can't hear the compressor engage. I looked at it and it looks like it has a isolated ground off by the fly wheel to where the 12 volt power wire clamps down on the top of the compressor. If it is a isolated ground, i take it that it has to be reconnected right? also there is no power on the other wire (the one where it actually goes to the compressor).. I checked all fuses and the relays and they seem fine.. So question is, is it a isolated ground? is that a 12 volt line going to the compressor, and even if the ground is re-attached would that activate the power to the compressor? Sorry for long winded message. This is on a 2003 Kia Rio LS . 1.5 liter motor. ... Thank you in advance for some valid input.

rob
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#2 (permalink) Old 07-19-2011, 10:27 PM
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Register with Kiatechinfo.com (its free) and look through the service manual. I don't see a ground wire. I see only the power wire to the clutch. The ground is the body of the compressor and is bolted to the engine which is grounded to the battery/frame.
There is a dual pressure switch up on the fender (pass side) that will stop the compressor if charge is too high (too hot/fan not working/overcharged), and also if system is undercharged (too low a pressure will freeze the system and/or not return oil to compressor properly). If I recall correctly, there is a pretty good write up on the operation of the A/C system there in the service manuals.
My 2004 does NOT have an isolated ground. Only the one power wire to the clutch.
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#3 (permalink) Old 07-19-2011, 11:22 PM
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Thanks for the reply,
I checked the wire to the dual pressure switch up on the fender and there is 12 volt to it. Ok the power to the clutch there is none, there is nothing. So the wire that is bolted on top of the compressor/clutch is or could be a isolated ground on the unit itself(which is disconnected). So the question is then how come there is no power then to the clutch? From what i see/tested there is no blown fuses for the a/c and the what i can tell are relays for the a/c are operational too. I have tested the "relays" by switching out the fog light relay and the a/c relay. after doing that still having the fog lights operational. So that tells me its still good. I press the a/c switch in the car and the light goes on and I hear/see the fan kick in when switch on, with the a/c switched off the heat controls all work great.. Turn to hot and it blows hot and when to cold it blows luke warm/normal air. Any ideas are welcome. I am thinking a grounded out or broken wire some where. Maybe i can test the clutch by directly connecting it to a 12 volt line or battery and see if it kicks in. Sound ok?

rob
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#4 (permalink) Old 07-20-2011, 08:08 PM
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Yes, definitely. Apply power to the clutch wire and it should engage. Maybe you have an extra ground wire I don't have but the principal should still be the same.
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#5 (permalink) Old 07-20-2011, 08:25 PM
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You could have bad Thermistor. It interrupts power to compressor relay to prevent evaporator freezing. If it is bad it won't let compressor kick on. According to Kiatechinfo website remove glove box and check for power across terminals 2 and 3 of the thermistor harness. Above 35 degrees (as yours obviously is...) you should have 12V.
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#6 (permalink) Old 07-20-2011, 08:35 PM
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haha great! I will check it out.. I was just looking thur the manuals now as a matter of fact. (tring to track that wire).. Will get back to you with a update.. hope it could be as simple as a thermistor....

rob
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#7 (permalink) Old 07-20-2011, 08:37 PM
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Hey lost loven I know you checked the relays and fuses but did you check your condenser fan fuse in the engine compartment I had mine blown on my 02 rio years ago and compressor clutch would not engage just somthing else to check reguards, ronjohn
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#8 (permalink) Old 07-20-2011, 09:04 PM
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hey thanks ronjohn, I will check that out, so that is not in the fuse panel under the hood or is it? I checked all fuses and relays regardless in the fuse panel there. Where would the condenser fan fuse be? In the fuse box under the hood i probably checked it then.

rob
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#9 (permalink) Old 07-20-2011, 09:13 PM
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Global Service Way

looking here you can make out the isolated ground that goes by the fly wheel to the body of the clutch which in turn is obviously grounded out . " - " No time to check this out tonight bust first thing after work tomorrow.
1st thing is looking for the condenser fan fuse.
2nd if 1 doesn't pan out then hook a 12 volt up and see if clutch engages.
3rd is 1 and 2 does not work then look into the thermostat behind the glove box and test power across terminals 2 and 3 of the thermistor harness.

rob
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#10 (permalink) Old 07-20-2011, 09:23 PM
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Yep it is under the hood in that fuse box not the one in the car under the drivers side compartment give it a check this is just from experiance hope this is helpfull look at kia tech for schematics like kevster says for troubleshooting . Reguards ronjohn
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