No A/C in 2003 EX 4 cyl - Drive Accord Honda Forums

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Old 04-03-2007, 07:48 PM
brickbat brickbat is offline
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No A/C in 2003 EX 4 cyl

Brand new (to me) car - just had it a few days and no A/C. When I set the temp controls to their lowest temp, turn on the A/C, the condensor fans turn on, as expected, but the clutch on the A/C compressor doesn't pull in and, of course no cooling.

I checked the low side pressure and saw 70 PSI (65 degree day). The MG Clutch fuse is OK.

Tried princess' A/C DTC technique, but wasn't able to get the DTC mode to work.

Any ideas?
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Old 04-04-2007, 08:31 AM
PennHonda PennHonda is offline
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This could be several things. (I only have the specs for my 95, so your 03 might be slightly different.)

Fuses, Clutch Relay, or a bad Compressor Clutch Coil.

For Fuses: My accord has three fuses that should be checked. #4 and #8 inside the car and #34 in the engine bay. I would expect your 03 to be similar.

For Relay: White wire should have battery voltage to ground. If you jump the red and white terminals, the compressor clutch should click.

For Coil: Check resistance from the plug at the compressor to compressor body. Resistance should be around 3.6 ohms.

I would also check that the wire leading to the ac compressor isn't damaged.
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Old 04-04-2007, 09:51 AM
brickbat brickbat is offline
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All good suggestions. Is the clutch relay located in the under-hood fuse box?
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Old 04-04-2007, 10:26 AM
PennHonda PennHonda is offline
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My relay is located on a bracket near connected to the radiator near where I add washer fluid.
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Old 04-04-2007, 11:01 AM
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there's an article in this service news about losing the freon due to a bad O ring.... If there's no freon, the compressor may not engage.
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Old 04-23-2007, 06:37 PM
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I ordered the Helms Service Manual. Very nice and well worth the $70.

The problem turned out to be the A/C compressor clutch relay. It was located in the under-hood fuse box, near the 7.5A clutch fuse. To test it, I swapped in the (identical) radiator fan relay, and the A/C started working. Interestingly, when I put the 'bad' relay back in the radiator fan relay socket, the radiator fan worked, too. So, it appears the relay was intermittent, but for the moment seems fine. The questionable relay is back in the A/C cluth position, so if it fails again, I'll know right away.
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