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I had this same problem on my 2003 Odyssey EX. The fan (front) only worked in the Max position and it blew warm air out of the front vents. The rear vents only blew out warm also. The compressor would not work and I also could not add more refrigerant. I decided to change the Transistor Assembly (as others have done), located on the passenger side under the right side of the glove box.
The dealer wanted $73.23 for the part. I had a 10% off coupon which helped.
It took me a little longer, about 40 min.
When I was finished the fan worked in all settings, the compressor would come on and I had cool air. I was also able to add more refrigerant.
Thanks to all of you. This site is really great and the best place to find information.
Aloha,
 
I fixed my 2000 Odyssey LX fan issue (same as the original poster) thanks to this forum post. Here are some points to update the thread:
1. For the LX, there is a new part number for the fan blower transistor: 79330-S84-505, which replaces 79330 S84 A01
2. The location of the transistor is at the right front corner of the passenger footwell, directly adjacent to and in front of (i.e. towards the front of the car) the fan itself
3. I found the new part for about $31 from a marketplace vendor on Amazon, possibly a closeout, but for all other vendors the price was >$50
4. The plug was very difficult to remove from the old part. I ended up using some channel locks to gently break the outside "female" receptacle on the old transistor--it was very brittle and easy to break.
5. I did not remove the battery negative lead to do this repair, as I assumed that the power to the fan/transistor was controlled by the ignition switch. But this was an assumption--you should either verify my assumption, or disconnect the lead before doing the work.

Although this video is for the EX, this does show the location of where to find the transistor:
 
Replaced blower motor resistor but

Replaced blower motor resistor but no joy. That had worked twice in the past, and for a time it would kick on when my wife hit a bump. What should I try next? I've read some posts that mention the relay or the fuse or the actual motor but need some further guidance. Temps are getting into the 80s, and I need to keep my wife cool.
 
Replaced blower motor resistor but no joy. What should I try next? I've read some posts that mention the relay or the fuse but need some further guidance.
You need to start by posting year, make and model with the exact symptoms and then we can guide you through doing some checks using a test light or DVOM to determine the problem. Just because someone else's problem was a bad transistor that doesn't mean your problem will be the same.
 
Thanks John. Tried to edit post but 10 minutes had expired. I'm waiting on the administrator. I have an 07 Odyssey EX and the blower motor will not blow air regardless of which setting I select. Rear is good. This has happened in the past and replacing the resistor solved the problem 2x in the past but not tonight. Thanks for any guidance. I have a Craftsman voltmeter but have misplaced the leads and will have to purchase some tomorrow.
 
And? You are making it really difficult to help. Need exact symptoms. The more detailed the better.
I thought my profile name OdyPete07 gave it away. I have an 07 Odyssey EX with over 245K miles with symptoms the same as on this thread. Bought a new voltmeter at Lowes for $27 with my veterans discount! Both my new and old resistor checked good on "Ohms" check. I then tested continuity of 40 amp fuse under hood. That checked good. Wasn't smart enough to check the relay. After talking with Chris at local Advance Auto, I purchased a blower motor on line for $67 with my discounts. From his experience repeated resistor failure may be sign of motor going bad. After struggling to get the wire harnesses out of the way I installed the blower motor and I NOW HAVE COLD AIR BLOWING once again. Glad to keep my wife happy here in Virginia with temps going into the 80s.
 
I'm glad you got it fixed but you never even said what was wrong with your car until now. You can't expect people to assume what you're working on by your profile name. There are so many different sets of symptoms...fan only works on high speed, fan doesn't work at all, or something totally different.

A quick check with a volt meter at the blower connector would have identified the bad blower motor in minutes but we never even got to what year or model vehicle you had or even what was wrong with it.
 
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