Last post on Feb 03, 2012 at 11:05 AM
You are in the Acura MDX
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Acura MDX, SUV
#1 of 22 No power/air to rear heating/AC 2003 MDX touring
Jan 21, 2009 (5:19 pm)
I have no power and air to my rear heat/AC on 2003 MDX touring. I do however have regular power to the front unit. The dash board light comes on to activate the rear unit, but no air hot or cold. I notice too that the the two air directional buttons no longer light up.
I have tried to look for a bad fuse under the hood, but have not notice anything unusual. The only strange thing I can recall happening some time ago was while driving slow, a loud squealing noise underneath the hood caused the the engine check light to come on briefly. I turned the car off, looked underneath the hood, but could not find any loose belts or parts. I turned the car back on, and everything appeared ok. It wasn't to much later that I came to realized
that the rear unit had no air or power. Does anyone have a clue as to what might be the problem before I take it to the dealer? Thanks in advance
#2 of 22 Re: No power/air to rear heating/AC 2003 MDX touring [ronness]
Jun 08, 2009 (5:18 am)
I have a 2002 MDX touring with 112k miles and just found that the rear AC unit is not working, DTC indicates a problem with the blower motor. Both fuses are ok. I do not recall any noise like you described. Did you find out what the cause was in your vehicle? Any help before I take it to a dealer? Any help from Acura?
#3 of 22 Re: No power/air to rear heating/AC 2003 MDX touring [ronness]
Jun 08, 2009 (8:20 am)
I had this same problem on our 2002. The fix is relatively straightforward if your handy with a soldering tool.
Here is a link to a thread with full details. Search through the thread for pictures of the repair...
#4 of 22 Re: No power/air to rear heating/AC 2003 MDX touring [knudsenj]
Jun 18, 2009 (10:51 am)
Thanks for the links. Got the thermal cutout from Digi Key, 0.45 plus shipping. Fiix took about 30 - 45 minutes. Blower screen was very dirty. Do not know why Acura/Honda did not make cleaning the filter a maintenance item. Called the 2 Acura dealers in the area, they said there was no recall or TSB on the problem. Could not find one online either.
#5 of 22 Re: No power/air to rear heating/AC 2003 MDX touring [knudsenj]
Jun 25, 2009 (6:53 am)
I've got the same rear air problem with a 2002 MDX. I cliced your link to the fix but it did not work. It goes to a Rick Ashley music video. can you send a new link to the fix instructions?
#7 of 22 Details on fixing the rear ac problem in a 2003 MDX?
Oct 11, 2009 (6:15 am)
I have this problem, but the previous mentioned link doesn't work? Someone mentioned the thermistor, getting it from "Digi Key"? Does anybody have the instrucutions on the repair that can be added to this forum.
Thank you, Dave
#8 of 22 Re: No power/air to rear heating/AC 2003 MDX touring [dmz616]
Oct 12, 2009 (3:20 pm)
Do you have the details on replacing the thermal cutoff? What part to order and from where?
#9 of 22 Re: No power/air to rear heating/AC 2003 MDX touring [mdxdriver14224]
Oct 13, 2009 (2:11 pm)
The part that is soldered inside the transistor assembly that went bad is a Thermal Cutoff (like a pigtail fuse) rated at 114C, 2A,/250VAC. Digi-key (800-344-4539) part number P10920-ND. Piece price was around $0.50, ordered a few since postage was a couple of bucks. Take the vertical carpeted piece out at the bottom drivers side of the center console being careful not to break the plastic clips. See the wire vent; clean this as the clogged vent is what causes the overheating. To the rear of the vent, toward the rear of the vehicle, see the plugged in transistor assembly. To remove, twist it. It may be hard to remove, had to use a pair of special pliers that my honda guy had, but it may come loose without needing them. Unsolder the thermal cutoff & solder in the new one, etc. We try to remember to turn off the rear unit at the dash when nobody is in the rear seat, especially on a long trip. Do not know wht Acura did not at least make the cleaning of the vent a maintenance item!
#10 of 22 Re: No power/air to rear heating/AC 2003 MDX touring [dmz616]
Oct 13, 2009 (7:14 pm)
Thanks for the detailed item and installation, I'll let you know how it goes.