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Hello. I have a 2007 Honda Odyssey EX. I turn the a/c switch on and nothing happens. No movement of the clutch when the a/c is turned on. The clutch does move freely using a screw driver. I am unable to check for proper pressures as the compressor won’t turn on. I am researching whether to jump the lower pressure switch, but am unsure if this method is safe. How do I test the relay for proper function. If the relay is not the problem, how do I test if the clutch or the stator coil is bad? Thanks for your help.
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You can jump the relay just to see if the clutch does in fact work. you can do this with the engine off. These systems use a solid state relay if I remember correctly and they are prone to failure. The pins for the clutch should e the two big ones. Also you could just switch that relay out with another one like it in the box and see if it turns on then. If none of this works next step would be to check and see if you are getting battery voltage on the wire near the A/C compressor. If so also check for ground on the compressor itself. Grounds through contact with the block. If all that is good then most likely bad compressor
I found a diagram that someone had posted about the a/c relay. There are four pin slots on the fuse box. Pin 1 = Always hot with 12 volts. Pin 2 = Goes to the stator/clutch. Pin 3 is activated at 12 volts when the key is in position 2. Pin 4 = Becomes hot with 12 volts when the a/c switch in the vehicle is turned on. When it’s hot, it causes the relay to activate pins 1 and 2 and thus turns the compressor on. I tested the pin slots at Pin 1 (always hot with 12 volts), Pin 3 (Hot when key is in position 2) and Pin 4 (a/c switch) with my multi meter and all were hot at 12 volts. So I put the relay back in and turned on the a/c switch. I verified 12 volts at Pin 4 (a/c switch), but I got nothing at Pin 2 (stator/clutch), which is connected to the a/c stator/clutch. I could have tested the relay by applying 12 volts from the battery directly to it, but I didn’t want to risk ruining the relay, so instead I jumped Pin 1 and Pin 2 together and the compressor turned on. This confirmed that my compressor was working and that my freon was non existent. I could have jumped the low pressure switch, but this method was a lot better and I was able to test more systems such as the a/c switch, power from the key, etc. I charged it with 2 cans of freon, added some dye and found the leak at the condenser. Looks like a rock hit it. I read up on the odyssey forums that this was a common problem due to lack of protection from the grill. Had I known, I would have beefed up the grill and probably could have avoided this problem.
I bought this dye injector from autozone: http://www.autozone.com/test-scan-and-specialty-tools/uv-light-and-accessories/quest-2-oz-uv-dye-injector/875151_0_0/?checkfit=true and uv dye for about $20. Pretty good deal and I can use it on future vehicles. It was better than spending $20 bucks on freon with dye. I bought two cans at walmart for about $14.
Another quick question. When I replace the condenser I was thinking about replacing the drier. I was wondering if I needed to add oil to the drier before installation?
you can add oil to it before you put it on yes. rule of thumb is 2 OZ for a receiver/drier or any other part you replace. the condenser itself does not hold oil like the receiver drier. However the correct way would be to dump as much oil out as possible of the old parts and measure what comes out and add that amount back in. I think you will find that you wont get much oil out though.
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