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02 Honda Civic Lx AC not blowing cold air
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co.22323
New User
Apr 1, 2012, 1:16 PM
Post #1 of 10
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02 Honda Civic Lx AC not blowing cold air
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2002 Honda Civic Lx 1.7, 140000miles
A couple months back my ac stopped blowing cold air, so i checked pressure and it was reading low, I filled it up with r134a and it started working fine. A couple weeks back it stopped blowing cold air again, so I checked low side pressure and it was reading about 45 with temperature at 80. According to my gauge this reading meant it was over pressurized, so I vented so of the refrigerant and checked it again a day later but the pressure was still reading about 45.
Both of my fans come on, but the compressor clutch does not. I checked the fuses and it was not blown but i replaced it any way and it stil did not help, so I swapped it with the fan fuse and the fan was still working but not the compressor clutch.
Then i jumped a wire from the battery to the connector on the compressor, and when i did that it worked, but it was still blowing hot air. So i check the signal wire and it is receiving battery voltage. After that i checked the connector on the receiver drier and it was also getting batter voltage but when I tried to jump with circuit with a wire from the batter nothing happened.
I tried to check reference voltage at the compressor connector but could not figure out where the put the leads from the multimeter tried a couple combinations and got no readings.
I also checked voltage and dc current at the fuse and i got 5.1v and dc current was above 13.
I have not yet checked high side pressure, nor have i been able to locate the high/low pressure side switches on the ac lines. The only connectors i have found are the one the compressor and the one on the receiver drier.
I don't know what step to take next, I am thinking it may be the switch on the receiver drier but I am not 100% any and all help will be greatly appreciated.
I am familiar with car parts but not ac too much so I apologize if I used the wrong terms or my descriptions are off.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 1, 2012, 1:22 PM
Post #2 of 10
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Re: 02 Honda Civic Lx AC not blowing cold air
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?? If compressor won't engage than tell me how you "filled it up" with refrigerant and knew it was right? Too little will stop cooling and too much can croak a compressor.
Could be another reason but know the 2/3 or more of not cooling is from a leak and subsequent low charge.........
T
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 1, 2012, 2:41 PM
Post #4 of 10
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Re: 02 Honda Civic Lx AC not blowing cold air
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So true Hammer. Just primal understanding of how temp sensitive refrigerant is would choke a horse never mind the other zillion things involved!
Tom
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 1, 2012, 4:18 PM
Post #6 of 10
(14787 views)
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Re: 02 Honda Civic Lx AC not blowing cold air
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co.22323 - You found pressure after just venting it out - duh. Plain air with some heat would have pressure. Send this job out before you get hurt.
*************************
DS - back when we thought about not discussing A/C here never mind air bags. One tech didn't want to discuss brakes after noting most of the DIY skills of folks who found this joint.
Truth is I thought site would just crash and burn long ago now but got popular instead.
Glad to see that all regulars push safety and not afraid to suggest folks get help based on what a problem is...........
Tom
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co.22323
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Apr 1, 2012, 5:48 PM
Post #7 of 10
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Re: 02 Honda Civic Lx AC not blowing cold air
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Well i never checked it after i filled it up but i assume the clutch was engaging after i filled it up because it was blowing cold air. I thought there might be a leak also but now it is reading overcharged, i know that can be caused by to much fluid or a clog but i am not 100% sure.
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co.22323
New User
Apr 1, 2012, 5:51 PM
Post #8 of 10
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Re: 02 Honda Civic Lx AC not blowing cold air
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Excuse me for seeking help i didnt know there was a problem with that, i have taken my car to over 4 different shops for ac repairs and paid over 300 just for diagnosis but no one has been able to point out the issue. Thanks for the help tho :)
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Discretesignals
Ultimate Carjunky
/ Moderator
Apr 1, 2012, 5:59 PM
Post #9 of 10
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Re: 02 Honda Civic Lx AC not blowing cold air
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We are just looking out for your safety and others that come on here for ac advice. Plus, we don't want to see you wreck your system which would cost a lot more than $300 to repair. Most certified shops that do ac work should be able to figure out your problem. You can't tell how much refrigerant is in an ac system by looking at pressures. Pressures change with temperature. The right way is to use a machine that sucks the refrigerant out of the system, so you can weigh it. Systems are charged by weight, not pressure. If you have the wrong weight of refrigerant in the system, you can damage the compressor.
You can't use one of those kits you buy at walmart or autoparts stores to diagnose ac systems. I have seen too many DIY try to add refrigerant thinking it was low from reading a generic low pressure gauge on one of the kits and overcharge the system because of a stuck expansion valve. Some of those kits have oil mixed in with the refrigerant and you can also overcharge the system with too much oil causing compressor slugging.
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 Apr 1, 2012, 6:00 PM)
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Hammer Time
Ultimate Carjunky
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Apr 1, 2012, 6:03 PM
Post #10 of 10
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Re: 02 Honda Civic Lx AC not blowing cold air
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You have just enough knowledge to get you in a lot of trouble. 45PSI without the compressor running is just an empty system and forcing it by hot wiring the compressor will just serve to ruin the compressor and a good portion of the rest of the system. A/C repair is not for the DIYer. If you paid over $300 for diagnosis and still don't know what it wrong, then you are taking it to people that shouldn't be touching A/C either. Find someone that specializes in A/C repair. You won't find a magic answer on any forum. The car needs to be tested in person.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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