2003 honda accord v6 4dr. no air comming out of a/c or heater : Solution
i just fixed my 2003 honda accord. i had the same problem, no air comming from my a/c & heater. it was the power transistor. it is located on the passenger side firewall. 1st take the panel off (under glove box) it is held by 2 clips. you can use an panel popper, flat screwdriver or just pull it down. at the firewall slightly to the left you will see a plug with 4 wires comming out of it. the transistor is held by 2 screws. unplug, and unscrew. ( you might need an angle screw driver, or tip.) i used a small drill and angled bit, with phillips tip. just pull transistor toward yourself once you have it unscrewed. replace part, and assemble in reverse order. ( you do not have to disconnect car battery). make sure you screw the new part in, and plug in, then turn car on and test a/c & heater. everything should work now. should take 10-20 min. to replace. part cost $70-85 (its a dealer item only).. make sure to call dealer to see if they have it in stock. mine did, but in some forums, they mentioned that they had to special order it.
.

 

Part is available in the aftermarket. Call around, compare prices and make your decision.

Double post, so yes I answered both.......Sorry

 

The blower motor on my 2004 Accord decieded to stop working in middle of this bone cold winter - I found this step by step fix with photos on Honda-Tech.com and it worked like a charm. I first tried the fuses, relays, banging the bottom of the blower motor, seeing if the blower motor had a short and checking the code off the radio display all items that were suggested to try first. When none of that worked I took the plung at this fix even though my auto mechanic skills are very limited and the results were great. Easy instructions with great photos, I tested the resistor and it was bad - ordered the part $68 and had the part back in and the blower motor was back up and running.

DIY- How to Fix, AC power transistor
Disclaimer:
User is presumed to have a fair level of mechanical or auto electrical skill in doing this DIY. The author shall not in any way be held responsible for any damage resulting from user’s fault or failure to follow the suggested steps proposed by the author. It’s the user’s responsibility to research thoroughly on the project and validate this DIY.

This DIY based on the three items that I repaired before so I presumed that once the AC blower on your EM/ES is not working the AC power transistor might be the cause of the problem. IF IT HAPPENS THAT THE REPAIR ISN'T SUCCESSFUL, THERE MIGHT BE ANOTHER PART THAT NEED TO BE FIXED. Please refer to your local dealer or reputable mechanic for further diagnosis.

Tools and Materials:

• Philips screwdriver
• a Tweezer
• Soldering iron and lead set.
• 1ohm 1/4 watt resistor

You will find the AC power transistor module here.


Removing the AC blower cover isn't that difficult, see the pics below.





The defective part.


Remove two screws.


Now release the lock to remove the AC power transistor module from the connector.


Notice the heatsink, the power transistor itself and the thermistor are attached to it.


Using the tweezer release the hooks to open it. refer to below pics.



That's the thermistor its a PTC(positive temperature coefficient-the resistance increases with increasing temperature) check with DMM it must be shorted or have at least 0 to 2 ohm resistance depending on the temperature of the heatsink.



If it's open or no resistance at all, replace it with a new one, or solder a 1 ohm resistor in parallel with the thermistor as shown.


Assemble in the reverse order of removal and re-install the power transistor.

Hope you like it .

One of a happy fella who tried already this DIY: http://www.honda-tech.com/zerothread/2036600

 

Thanks for the easy to follw instructions. It worked great!! Question: Radio Shack didn't have a 1 ohm resister so I used the smallest they had which was 10 ohms. It still worked. Any long term problems from using 10 ohms vice 1 ohm?

 

If you look in the common DIY thread on top of the gen tech help forum, there is a link to fix the blower transistor for 7th gen accords. I corrected parts of that thread.

That writeup that was posted in this thread is wrong.

You should solder in a thermal fuse, and it likely blew for a reason. The chip underneath the board may be overheating. You can see the thermal fuse under the board if you look carefully in one of the pics.

 

PA, which one is wrong? We should remove the incorrect one, or at least move it out of here & explain what's wrong or which year cars it IS good for.

 

What is posted above in this thread is wrong. I used those same pics for the DIY, but I corrected the writeup.

 

I am having the same problem except with my 2004 Honda Accord. The fan does not work on any setting. I pulled out the resister and it tested just fine as did all the fuses. Should I assume the fan motor is bad? Is that something that is somewhat easy to replace? How can I test the motor itself?

 

Put 12v to the motor...does it spin?

 

What is the easiest way to do that? Thanks