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Old 05-10-2011, 05:19 PM   #1
imadigitalgod
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Default AC Wiring Diagram?

Hey all,

Does anyone know where on the net there is a wiring diagram for the AC system on a 1999 Civic? My compressor turns on when it is cooler out and doesnt work most of the time when it is warmer out; I am guessing that this is a relay problem to the compressor.

The condenser fan turns on when the AC button is pressed but sometimes the compressor does not when it is warmer out; not an extreme temperature though. When it cools down the compressor works. When the compressor does work when its warmer out, the system works perfectly; there isnt anything abnormal. I see there are two relays that are on the AC system so im trying to see which relay needs to be changed. Any help is appreciated!
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Old 05-10-2011, 05:30 PM   #2
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Default Re: AC Wiring Diagram?

Check the FAQs sticky for the diagram.

You may or may not have a relay problem.

Swap the clutch and fan relays to see if the compressor problem goes away and is replaced by an intermittent fan problem.
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Old 06-01-2011, 10:07 AM   #3
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Default Re: AC Wiring Diagram?

Quote:
Originally Posted by RonJ@HT View Post
Check the FAQs sticky for the diagram.

You may or may not have a relay problem.

Swap the clutch and fan relays to see if the compressor problem goes away and is replaced by an intermittent fan problem.
Unfortunately I think it is a compressor problem, probably the clutch. I swapped the relays when the compressor wasnt on and the fan worked perfectly fine with the compressor relay but the compressor didnt work with the fan relay. When i put the fan or compressor relay on the compressor circuit, the engine reved up a little (because of the draw of electricity through the compressor's coil im guessing) but the clutch didnt want to seem to want to kick on. I will have to see in the manual on how the clutch is on there and if it can be separated or if the whole compressor needs to be replaced
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Old 06-01-2011, 10:51 AM   #4
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Default Re: AC Wiring Diagram?

Have you measured the clearance between the armature plate and pulley? If it's too wide, it can cause a problem like the one you are having.

Click the image to open in full size.
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Old 06-09-2011, 07:00 AM   #5
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Default Re: AC Wiring Diagram?

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Have you measured the clearance between the armature plate and pulley? If it's too wide, it can cause a problem like the one you are having.
It looks like its the clutch set or the field coil that is going bad. I followed the honda flow chart and it says to short the relay contacts that send voltage to the relay coil; i did that and nothing clicks on. I put the relay back in its place, turned the car on with the AC on, got under the car, disconnected the compressor power wire, and there was voltage. I hooked it back up to the clutch and it didnt kick on; the condenser fan was running the whole time.

This tells me that the clutch set or field coil is going bad instead of an ECU or switch problem. anyone agree?
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Old 06-09-2011, 07:12 AM   #6
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Default Re: AC Wiring Diagram?

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I...turned the car on with the AC on, got under the car, disconnected the compressor power wire, and there was voltage.
This^ finding unambiguously shows that the clutch cannot engage despite receiving voltage.

The next steps are to identify the clutch component that is at fault.

1) Measure the clutch clearance.

2) Measure the resistance of the coil.

3) Check the thermal protector for continuity.

Click the image to open in full size.
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Last edited by RonJ@HT; 06-09-2011 at 07:29 AM.
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Old 06-09-2011, 09:28 AM   #7
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Default Re: AC Wiring Diagram?

Quick question. Did you check your Freon level? Might not be up to pressure for the compressor to kick in properly all the time.
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Old 06-09-2011, 09:52 AM   #8
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Default Re: AC Wiring Diagram?

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Quick question. Did you check your Freon level? Might not be up to pressure for the compressor to kick in properly all the time.
Measuring voltage at the compressor indicates that the pressure switch has not been tripped off.
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Old 06-09-2011, 07:01 PM   #9
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Default Re: AC Wiring Diagram?

Quote:
Originally Posted by boostedef123 View Post
Quick question. Did you check your Freon level? Might not be up to pressure for the compressor to kick in properly all the time.
Yes, i hooked up my gauges last night. I dont have the exact pressures but they definitely seemed within range; both on the high side and low side. The r134a level is ok because the ac works sometimes and then sometimes it doesnt. I need to check the suggested parts tomorrow
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Old 06-14-2011, 01:10 PM   #10
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Default Re: AC Wiring Diagram?

Quote:
Originally Posted by RonJ@HT View Post
This^ finding unambiguously shows that the clutch cannot engage despite receiving voltage.

The next steps are to identify the clutch component that is at fault.

1) Measure the clutch clearance.

2) Measure the resistance of the coil.

3) Check the thermal protector for continuity.
In that picture, do you just measure the clutch with a feeler gauge on the very outside lip between the plate and pulley? or do you stick the gauge far in between the pulley and the plate? th. ere seems to be a sort of lip inside between the plate and pulley

I know the thermal protector is good because I hooked an LED in parallel between it and the coil, and ran it inside the cabin of the car. I did this so I can see in real time without disconnecting things, if/when the compressor is getting power when the clutch doesnt kick on. It looks like when the clutch doesnt kick on, the clutch is always getting power. This seems to happen only/mostly when it is hot out. One thing I noticed last night is that the system seemed to cycle like the AC was working (it wasnt blowing any cold air) on and off. I could tell that the coil must have been using up electricity while it was cycling because (the condenser fan was already running the whole time) when the LED lit up (showing there was power to the coil) the engine sped up a little like there was more current draw on the system.
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Old 06-14-2011, 02:47 PM   #11
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Default Re: AC Wiring Diagram?

Quote:
Originally Posted by imadigitalgod View Post
In that picture, do you just measure the clutch with a feeler gauge on the very outside lip between the plate and pulley? or do you stick the gauge far in between the pulley and the plate? th. ere seems to be a sort of lip inside between the plate and pulley

I know the thermal protector is good because I hooked an LED in parallel between it and the coil, and ran it inside the cabin of the car. I did this so I can see in real time without disconnecting things, if/when the compressor is getting power when the clutch doesnt kick on. It looks like when the clutch doesnt kick on, the clutch is always getting power. This seems to happen only/mostly when it is hot out. One thing I noticed last night is that the system seemed to cycle like the AC was working (it wasnt blowing any cold air) on and off. I could tell that the coil must have been using up electricity while it was cycling because (the condenser fan was already running the whole time) when the LED lit up (showing there was power to the coil) the engine sped up a little like there was more current draw on the system.
Measure the gap all around the outer edge.

The ECU causes the idle speed to increase when the A/C button is pressed even if the compressor clutch fails to engage.

Did you measure the resistance of the coil?
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Old 06-23-2011, 04:36 PM   #12
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Default Re: AC Wiring Diagram?

Quote:
Originally Posted by RonJ@HT View Post
Measure the gap all around the outer edge.

The ECU causes the idle speed to increase when the A/C button is pressed even if the compressor clutch fails to engage.

Did you measure the resistance of the coil?
It looks like it is the air gap that is the problem. When the compressor doesnt turn on and i tap the plate, the AC engages. Do I just pull off the plate? or do i have to pull the whole pulley off as well? And do I have to pull the compressor off of the system to do this or can it be done while bolted to the car?
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Old 06-23-2011, 05:10 PM   #13
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Default Re: AC Wiring Diagram?

Buy an OEM clutch set and install it. For example, check the Majestic Honda site.

The clutch can be removed and installed without disconnecting the A/C lines. Remove the compressor bolts and suspend the compressor from a rope. This should create the needed space to do the work.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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