I have a 2004 Honda Accord. The a/c compressor will not come on. The windsheild wipers work when they decide to. I have switched relays around but to no avail. Some one tell me whats wrong. The blower I have a 2004 Honda Accord. The a/c compressor will not come on. The windsheild wipers work when they decide to. I have switched relays around but to no avail. Some one tell me whats wrong. The blower motor resister was bad last summer and the fan wouldn't come on but that has been replaced. Now it works. Heat works but no air.

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Looking at wiring diagrams , using A DMM- digital multi-meter an testing the electrical circuit's is the way to find the problem . Because without testing anything said on here would just be guessing . Someone mite get lucky suggesting something to replace, this or that . You could replace a bunch of parts too , before fixing the problem. There is a relay in the electrical circuit that egages the compressor clutch on command from the PCM/ECM -engine computer . Windshield wipers problem could be a simple loose connection ,ground or voltage . Or the motor could be getting ready to go out all together .
Free wiring diagrams here http://www.bbbind.com/free_tsb.html
Enter vehicle info. year , make , model an engine size . Under system click on HVAC ,then under subsystem click on HVAC controls . Click search button then the first blue link . Shows fuse's ,relay ,A/C pressure switch , evap. temp sensor . All these have to be right or the computer will not turn on the compressor . The computer would also have to see a command from the HVAC control head . Alot has to happen before the computer will turn on the A/C .
Electric Testing Techniques You Need to Know

The Trainer 40 When the compressor won compress
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