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A/C and Heater on 2003 Saturn L200
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dmartin402
Novice
Nov 23, 2015, 7:18 AM
Post #1 of 12
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A/C and Heater on 2003 Saturn L200
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A?c and heater will not work.
The letters "OC" appear on display. What does this indicate?
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kev2
Veteran
Nov 23, 2015, 7:46 AM
Post #2 of 12
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Re: A/C and Heater on 2003 Saturn L200
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OC display, OK from memory I believe this is "Open Circuit"....on of the sensors is open, shorted etc- look at the ambient first I remember reading something.
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Tom Greenleaf
Ultimate Carjunky
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Nov 23, 2015, 7:46 AM
Post #3 of 12
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Re: A/C and Heater on 2003 Saturn L200
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Can't give you tons of help with that one but think if climate controlled it can't read what the sensor says probably on side or rear view mirror. Thinks it's -40F or C. about the same doesn't deal with that for either.
Any recent work or events that might have disturbed anything?
Best I can offer for now,
T
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dmartin402
Novice
Nov 23, 2015, 8:11 AM
Post #4 of 12
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Re: A/C and Heater on 2003 Saturn L200
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Thank you for your help. I have found the two wires that go to the outside temperature sensor on the driver's side front bumper to be unconnected. Do you think it matters which wire goes where on the sensor? There are two wires. One yellow and one black
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Tom Greenleaf
Ultimate Carjunky
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Nov 23, 2015, 8:28 AM
Post #5 of 12
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Re: A/C and Heater on 2003 Saturn L200
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Automobile anything wiring usually CAN'T be put together wrong. Something like it doesn't fit, plug has a nub that doesn't allow it wrong. Look for that. If it was replaced with some generic connectors I hope the wires go to the same color.
This would explain the OC you are reading from anything I could find. No clue if putting that back wrong will cause harm or so default to don't until sure,
T
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dmartin402
Novice
Nov 23, 2015, 9:14 AM
Post #6 of 12
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Re: A/C and Heater on 2003 Saturn L200
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Thank u T
I switched the wires and unhooked battery hoping to reset. It worked for about 30 seconds and then went back to OC
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Tom Greenleaf
Ultimate Carjunky
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Nov 23, 2015, 9:35 AM
Post #7 of 12
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Re: A/C and Heater on 2003 Saturn L200
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I'm on a real guessing goose chase myself with this one. First - don't do TWO things at once then check as you don't know which did anything. Why erase memory by disconnecting the battery?
As long as I'm guessing try to get an OHM reading from the sensor itself unplugged - just the sensor.
Whatever temp it is note that. Your call to wait for another ambient temp or just easy with a blow dryer to warm it up some and see if it reads another # for an OHM reading.
That's just what temp sensing things usually do is change how much current can go thru it. If broken I don't think temp with change the sensor's OHM reading.
Still don't understand why you can hook this up two ways and may not matter but not sure of that. If located where you said it may be a replacement job now?
Any clues to help? Are connectors some hardware store stuff or look original? If NOT original I'd check if wires were smashed in some even minor accident and fixed or rubbing somewhere. Why do you think you found it disconnected to begin with?
Said out of the gate not real sure of this set up and how it has any control over heat and A/C but is listed.
OK - try this: Almost everything will work with a defrost request. I'm just groping for ideas.
You already disconnected battery once so I guess do that again and see if you get your 30 seconds grace period again if only for info on that.
Mostly I really don't know and if this was in front of my I'd be hunting down info about how it's supposed to work and why.
So far doesn't seem to make much sense it cares about the temp outside for the temp requested inside unless also info for another control at the same time?
T
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dmartin402
Novice
Nov 30, 2015, 1:47 PM
Post #8 of 12
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Re: A/C and Heater on 2003 Saturn L200
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Tom
I did what you suggested. I checked the outside temperature sensor with a ohm meter. Using a hairdryer, I did get a different reading so I assume the sensor is working.
I put the sensor back on, unconnected the battery and got the same results. The display shows that everything is working. After about 30 seconds, the display reads -40 and then goes almost immediately to OC ext F Don't know if I have said this before, but the blower works .
Any further ideas are greatly appreciated.
(This post was edited by dmartin402 on Nov 30, 2015, 2:29 PM)
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Tom Greenleaf
Ultimate Carjunky
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Nov 30, 2015, 2:20 PM
Post #9 of 12
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Re: A/C and Heater on 2003 Saturn L200
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Kinda wish it hadn't done anything as now that suggests sensor works but signal doesn't make it or the receiving end has the fault.
At this juncture I'd be lost to get a specific this exact vehicle only subscription to AllDataDIY.com for the most detailed diagrams you'll get, send it out to an A/C specialty shop or try to chase the two wires to a plug checking for continuity along any and each plug.
Is this sensor on inside mirror or outside by chance? Did mirror get broken or fall off that you know of? If so that would be an area to look first.
Maybe someone here has some more info or tests you could do and info. I don't. Know that this is a volunteer FREE site and I'm done with biz so not buying info if I don't already have it to do this.
Wait a bit and keep trying or pick plan "B" for the fix. Best I can do from here,
Tom
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Discretesignals
Ultimate Carjunky
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Nov 30, 2015, 5:20 PM
Post #10 of 12
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Re: A/C and Heater on 2003 Saturn L200
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If you unplug the outside temperature sensor with the ignition on, what is the voltage on the yellow wire terminal in the connector? Don't shove your meter lead down into the terminal or it will spread it open causing a poor connection.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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dmartin402
Novice
Dec 5, 2015, 8:16 PM
Post #11 of 12
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Re: A/C and Heater on 2003 Saturn L200
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I discovered today that the heater does work. I can even adjust the temperature even though the display still reads OC.
As far as I can tell, the a/c will not come on.
The voltage reading on the yellow wire is 5.11 with the ignition switch on.
Any more ideas would be greatly appreciated.
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Discretesignals
Ultimate Carjunky
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Dec 5, 2015, 8:49 PM
Post #12 of 12
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Re: A/C and Heater on 2003 Saturn L200
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That is good you have 5 volts on that circuit. That means the climate control panel 5 volt regulator is working. Have you tried resetting the panel by disconnecting the battery for several minutes since you got the outside temperature sensor functional again? OC might actually be 0c or zero degrees Celsius since the sensor was unplugged.
There are a couple of preliminary checks you should do such as making sure the ac system has enough static pressure to trigger the low pressure switch. You will also need to see if there are any codes stored in the HVAC module. That requires the use of the factory or enhanced scan tool. You may need to take it to a repair shop that has the equipment and knowledge to diagnose it.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Dec 5, 2015, 9:01 PM)
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