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comnavguy
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Jun 10, 2010, 8:52 AM
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04 Honda Accord A/C inop
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Honda Accord (87,000 miles) with 3000 vtech and auto air. The A/C is not cooling and the circulating fans are not operating. Upon starting the car the A/C clutch kicks in just for a moment and then stops. The static pressure is about 120 PSI. When the clutch kicks in, the low pressure side drops to about 70 PSI and then the clutch cuts off. This occurs only upon starting the car. Once the engine is running, cutting the A/C off and back on does nothing.
It doesn't matter whether the system is set in Auto mode or MANUAL mode. The clutch is engaged for such a short time, I can't see what the high side measures.
This looks as if it's a case of over-charging, but I don't know what anyone else has done to this car.
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Hammer Time
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Jun 10, 2010, 9:26 AM
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Re: 04 Honda Accord A/C inop
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Your going to need a high pressure reading to determine what direction to go next. It could be overcharged but it could also be a weak clutch or relay. You can jump power directly to the compressor for testing but you need a high pressure gauge attached before you try that.
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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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comnavguy
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Jun 10, 2010, 5:29 PM
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Re: 04 Honda Accord A/C inop
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I'm sorry I didn't say that I had the high gauge connected. The clutch didn't stay engaged long enough to measure the high side. It started at static at about 120 PSI.
It doesn't seem to be a weak clutch. It clicks ON and OFF without any slippage or chatter. I can force it on, but I didn't want to do that first without checking this forum for suggestions.
If I do jump the clutch, do you recommend disconnecting the wire or is it OK to use a penetrating connector?
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Hammer Time
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Jun 10, 2010, 5:34 PM
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Re: 04 Honda Accord A/C inop
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You have to leave the connector so you have a ground.
I'm a little concerned about your static pressure reading. That shouldn't be reading that high unless it was parked in 100 degree sun for hours. That pressure should pretty much correspond to ambient air temperature.
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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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Sidom
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Jun 10, 2010, 8:28 PM
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Re: 04 Honda Accord A/C inop
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I was thinking the exact same thing...........120 lbs....damn
Also I'm not sure how you're checking the system but the correct tool for this would be a manifold gauge set with high & low gauges that both would be hooked up at the same time. If the system is coming on there is no reason you shouldn't be able to get both readings........
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comnavguy
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Jun 11, 2010, 4:11 AM
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Re: 04 Honda Accord A/C inop
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I am checking this system with a manifolf gauge set with both sides connected. As I posted in my first message, the static pressure is 120 PSI. Of course that's on both sides, but as I also said, the clutch is engaged for only a second - Just long enough to see the low side drop to about 70 PSI and the high side flicks maybe 10 PSI from the 120.
Then getting in the car and turning the A/C OFF and back ON, whether in auto or manual, does nothing. The only way to get the clutch to kick in is to turn the car off, let it sit for a few minutes and re-start it.
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Hammer Time
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Jun 11, 2010, 6:17 AM
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Re: 04 Honda Accord A/C inop
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As previously stated. 120PSI static pressure is way too high. It should match ambient temp at least close. That can mean it has the wrong refrigerant in it or it could mean the gauges are wrong but something is wrong there.
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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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Sidom
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Jun 11, 2010, 8:53 PM
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Re: 04 Honda Accord A/C inop
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Ok.....This is the 1st post I've seen with any mention of HP readings other than couldn't see it or didn't have time to see it, no matter.
As HT point out and I agree with, that static reading is way too high unless your ambient temp is 110° or higher....
The 1st thing I would do, would be to evac the system and recharge it with the correct amount so that wasn't a question...
To answer your other question, as long as there is freon & oil in the system, jumping for a minute it won't hurt it. You need to watch the pressures very carefully and if the high side gets too high, it needs to be shut off.....
It possible you have a restriction or electrical problem but right now I just can't get passed that static reading......
What is the outside temp when you're checking the system where you are at?
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comnavguy
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Jun 14, 2010, 9:27 AM
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Re: 04 Honda Accord A/C inop
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I'm in Dallas, and the temp was about 80 degrees in the evening with a humidity of WET. I've checked this system with two different manifold sets with identical readings.
I have not had a chance to force the clutch ON . I hope to be able to do that this Monday 14th evening.
One thing I haven't mentioned is that the blower is not working, which would suggest a blown fuse - but the clutch clicks ON when the engine first starts, and I've never seen an intermittent fuse.
Unless someone knows of something peculiar about this model of Honda, I think until I get to force the compressor ON and get other readings, we've gone about as far as we can go here.
Thanks for the help so far.
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Hammer Time
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Jun 14, 2010, 9:35 AM
Post #10 of 15
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Re: 04 Honda Accord A/C inop
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AGAIN, I am going to say your static pressure is too high and you should be doing an evacuate and recharge with the correct amount of refrigerant. I would do this before any attempts to jump out the system. You can't begin to diagnose a problem if you don't know exactly what it's charged with and how much. That pressure indicates something is not right.
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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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comnavguy
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Jun 25, 2010, 3:40 PM
Post #12 of 15
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Re: 04 Honda Accord A/C inop
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The owner of this car just graduated and she is sooooo busy getting ready to conquer the world...so I have had little access to the vehicle, even in this 100 + degree Dallas weather.
I haven't been able to see if the blowers work in the heater or vent function, so for now, my hands are tied.
I have told the lady that she needs to leave the car with me for at least 2 hours. If and when I get back in the car, I'll complete this thread with the fix.
Until then, thanks to everyone for the help so far.
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Sidom
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Jun 25, 2010, 6:54 PM
Post #13 of 15
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Re: 04 Honda Accord A/C inop
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Yea, I know how tough it can be to try to get a car away from a teenager.......
Logic would tell you that +100° temps would be enough to get the car for the time needed......But sometimes logic & teenagers aren't used in the same sentence 
Congradulations on the graduation.........
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comnavguy
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Jun 28, 2010, 11:14 PM
Post #14 of 15
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Re: 04 Honda Accord A/C inop
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YOU da MAN! It was the power transistor in the blower circuit.
The new graduate is now cool and COOL.
As for the ststem being overcharged??? I don't know but suspect too many cooks in the stew. Whatever it was, it's correct now, and operating is right on the book.
Thanks a bunch.
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Sidom
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Jun 28, 2010, 11:33 PM
Post #15 of 15
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Re: 04 Honda Accord A/C inop
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Good deal.........Glad to hear you got it going.... If you got the right temps out of the vents while not completely accurate is a good sign it's not overcharged....
Thx for letting us know the fix...........
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A check quick grab a test light & with the system & fan on check the blower motor connecter. If you have 12v on both wires, ground the ground wire ( be very sure you are grounding the correct wire) if the blower motor comes on the odds are very high the transistor is bad. Above is way to be even more sure of the diag...... With that being said......I still agree with HT on the static pressure, once you get the system operating you better be double sure it isn't overcharged or you could wind up damaging the system........