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Discussion Starter #1
Although it's been written in other threads, I'll state it again here as this is the first thing anyone should check as it's the easiest and to also help the search engines when someone does a search for it.

Symptom: A/C used to blow cold air and all of a sudden only warm air comes out.

Go under your hood and open the fuse box there. Pull out A/C Relay and shake it to see if anything is rattling inside. If it is, you most likely have a bad relay. The relay is the second big one from the left(the black one to the right of the green).



You can get OEM one or if you need one right away, Autozone has a generic Duralast one(part# 20569) for $5.99.

http://www.autozone.com/cooling-heating-and-climate-control/relay-blower-motor/duralast-relay-blower-motor/953413_0_5104/?checkfit=true

In this situation, I got lucky.
- Less than 5 min of labor = free
- Generic relay part down the street from me at Autozone = $5.99
- Shutup the nagging wife in 90+deg heat = Priceless

I hope this can make someone else lucky and save some bit of diagnosis time.
 

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Discussion Starter #3
Adding onto this thread with all the available relay info.

Available at Autozone:
Duralast Relay mentioned above - $5.99: http://api.viglink.com/api/click?format=go&jsonp=vglnk_146669805654211&key=0498ca95c9841da9ec55db54b98706dd&libId=ipsi1i7j01000bn2000DAcccyxe52&loc=http://www.mdxers.org/forums/74-second-generation-mdx-2007-2013/125906-c-blowing-warm-air-got-lucky.html&v=1&out=http://www.autozone.com/cooling-heating-and-climate-control/relay-blower-motor/duralast-relay-blower-motor/953413_0_5104/?checkfit=true&ref=http://www.mdxers.org/forums/74-second-generation-mdx-2007-2013/&title=A/C Blowing Warm Air - Got Lucky... - Acura MDX Forum : Acura MDX SUV Forums&txt=http://www.autozone.com/cooling-heat...?checkfit=true


Santech part #MT0610 $14.99 - http://api.viglink.com/api/click?format=go&jsonp=vglnk_146669804265618&key=0498ca95c9841da9ec55db54b98706dd&libId=ipsh7uye01000bn2000DAb0v0k4o6&loc=http://www.mdxers.org/forums/74-second-generation-mdx-2007-2013/79514-07-mdx-air-conditioner-c-blowing-warm-air.html&v=1&out=http://www.autozone.com/autozone/parts/Santech-Relay-A-C-Compressor-Control/2007-Acura-MDX-AWD/_/N-jq4yxZ91t26?itemIdentifier=946114_121804_0_&ref=https://www.google.com/&title=07 MDX Air Conditioner A/C blowing Warm Air - Acura MDX Forum : Acura MDX SUV Forums&txt=http://www.autozone.com/autozone/par...6114_121804_0_

Original OEM Relay(Same part number can be had at either Acura or Honda dealer) $12-$30 - 39794-SDA-A03

Superceded(supposedly improved) OEM version - $12-$30 - 39794-SDA-A05 (around $16 shipped from Amazon) - https://www.amazon.com/Genuine-Honda-39794-SDA-A05-Power-Assembly/dp/B00BFDH05Y

Also if this has gone on awhile, your A/C relief valve may have been compromised. If you look at the valve and see it covered with oil or any liquid, you may want to replace this valve(38801-P9K-E01) ~$35, but you will need to evacuate and recharge your whole system professionally.



If in a pinch or bind, you can also swap fog light relay with the AC clutch relay as they are the same. I'm sure most would rather have a/c over foglights when in a bind. ;)
 

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Discussion Starter #4
Update:

Well the generic relay only lasted a week. It could be I got one of the bad batches but at this point, I would recommend getting the OEM superceded relay ending in "-05". I would love to open up each one but they are epoxied together so it would be hard to take it apart in one piece. The relays really get hot under the hood during the summer and after touching one, I could imagine relays, especially one that could keep cycling on and off several times would need to be built very robust to withstand that type of activity in that environment.

So bottom line: If your a/c condensor relay goes out, swap in the relay from your fog lights(#1 in the diagram below) for the interim until you can get the upgraded OEM (-05) relay.

 
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