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A/C system diagnostics- Need codes.

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Old 06-28-14, 06:35 PM   #46
t2d2
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I've had a minor issue where my cold air (without A/C running) is a fair bit warmer than outside air temperature. I was starting to look into heater control valve stuff and the possibility that it's remaining open and allowing coolant to circulate, making the cooling fight the heating. While researching that, I ran across the diagnostic tests for the HVAC system ... didn't realize that process existed.

I've got one current (beeping) code: #21 - Solar Sensor Circuit

I haven't been able to find much about it, other than it often is triggered by testing in the dark. However, I tested while it was fairly bright outside, although at 6pm and not in direct sunlight. I did re-run the test with a flashlight pointed at the sensor, and that didn't change anything. (It is the clear plastic, flat sensor on the left side of the dash, right? Not the reddish dome sensor on the right side?)

Anyone know what the next step(s) would be in diagnosing the Solar Sensor Circuit? I didn't get any Code 22 with the engine running, as suggested earlier in the thread.

Edit: Just remembered one of the things I did find; a faulty coolant temp sensor could create the problem. I have faulty plugs/wires on both of my sensors waiting to be replaced, so there could be a easy explanation there.

Last edited by t2d2; 06-28-14 at 07:08 PM.
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Old 06-29-14, 01:04 PM   #47
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False alarm. I re-checked today in semi-direct sunlight (overcast, but a bit brighter than yesterday's testing conditions) and there are no codes. The Solar Sensor must be quite finicky as far as what it considers sufficient sunlight. So, back to the original thinking of it being heater control valve related...
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Old 09-21-14, 07:35 PM   #48
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bumping this thread guys....
95 sc400 pulling a code 42... servo inlet door. the air blows nothing but hot and all controls work just fine. ive cleaned up the ground on the ac comp to make sure it wasnt that. the ac comp does not engage ever. anyboy have exp with this code?
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Old 09-23-14, 08:06 PM   #49
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bumpin for a any info......
i dunno if its been said or not but once you get your codes pulled up, you can push the "fresh" air button and the system will began a check. it'll run through different settings and test different aspects of the ac components. you can pause it on any phase of the test by pushing the "recirculation" button and resume the tests by pushing the "fresh" air button. i found it helpful to pull the glove box out so i could watch the difference in the system as it tested the stuff.
on another note: i think i have discovered my ac comp to be inop. im going to replace it and hope that it fixes my problem since nobody wants to chime in.
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Old 10-03-14, 07:51 AM   #50
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bump for those guys that were concerned and those having similar problems.
code 41,42,43 FIX
basic problems: a/c light flashing with the ac never actually cutting on. the blower would work and all functions of the ac worked very well with the exception of the compressor never cutting on. system was charged and all wires were chased and proven to have good connections. the compressor wheel would spin only if provoked but would not maintain a constant spin. i bought a used compressor from a friend and swapped it out. i pulled the vacuum and charge the system up.
no codes. no problems. everything works great.
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Old 10-06-15, 05:05 PM   #51
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I know this thread is old but, I have in my car now code 41 and 43 but the A/C light is not flashing at all and my A/C work fine. I found this thread because I try to found also a sound that come from behind the radio. The car can be turned off but the key in the switch, swith only, not acc or on positio and the sound is there. But if I take out the key from the switch the sound disappears. Insert the key again on the switch and I active sw the A / C system and the sound returns. The sound is like this, clap, clap, clap, clap all the time. Someone had this problem before?
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Old 10-26-15, 09:26 AM   #52
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Quote:
Originally Posted by Mooney6959 View Post
I'm going to revive this thread.

I'm almost positive that I have a seized compressor, but it still works in a blue moon.
I ran the diagnostic on the A/C system, and it shows code 00, which I know isn't true. I've even had it run through the system check (by pressing fresh), but it still shows all is well.
I just called PepBoys (I know...) and they quoted my $1,050 to install the new one (NOT including parts) and basically get it going again.
Any thoughts on this?
I have a mechanic friend that told me if the compressor works sometimes then your problem is not the compressor. It's likely something electronic like a pressure sensor valve or???
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Old 10-26-15, 07:37 PM   #53
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Problem solved.
The A/C filter was broken and I do not know how that happened because it was only six months old. They spent leaves from a tree where I parked the car on work and that was the noise in the blades on the fan of the A/C system. Also, the screen show now 00. Everything is normal as it should be. Also, I forget to mention, that the A/C filter was OEM and I go to the Dealer because the filter was only 6 month old and the guy on part dept. change it immediately. Also, he told me that a full lot of that filter came difective from factory and that's why changed to me immediately. Plus, the full year warranty in all OEM parts. So, if you have the OEM cabinete A/C filter and no past a year yet, go and change it. Maybe you get the same issue that I have with my a/c filter later on.
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ac, button, circuit, codes, control, ecu, heater, invehicle, jump, lexus, pressure, problems, recirculate, recirculation, sc300, sensor, switch, temperature

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