Last post on Feb 03, 2012 at 11:05 AM
You are in the Acura MDX
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Acura MDX, SUV
#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.
#11 of 22 removing center council
Oct 24, 2009 (11:19 am)
dose anyone have a detailed diagram on council removal?
#12 of 22 2003 Rear A/C controls repair.
Oct 30, 2009 (6:46 pm)
The repair for my 2003 MDX, were exactly like the 2002 MDX mentioned earlier. The transistor assembly is removed by turning it clockwise about 1/4 turn. The thermocouple is acessed by removing the plastic cover and the metal heat sink. There are 2 screws on the end, and 1 screw holding the power transistor firmly against the heat sink. Thermo-coupler is soldered in two places and bent to fit along the top of the power transistor. make sure you leave some of the thermal grease so the new thermo couple makes a good seal against the heatsink and transistor. The thermocouple leads should be insulated before you solder it in place.
#13 of 22 Re: No power/air to rear heating/AC 2003 MDX touring [dmz616]
Jan 31, 2010 (6:35 pm)
I replaced the thermal cutoff and the rear a/c now blows just fine. So fine that I cannot get it to turn off, even with the front controls off and the front a/c completely OFF! The rear rheostat doesn't function either. Could there be a short in the transistor? I'm thinking the rheostat is/was broken and shorted the thermal cutoff instead of overheating the rheostat--any thoughts????
#14 of 22 Re: No power/air to rear heating/AC 2003 MDX touring [outbackgirl200]
Apr 14, 2010 (8:01 am)
my blower also wont turn off after i replaced the thermal cutoff. Anybody has any idea why it wont turn off ? i get cold and hot air when i turn the temprature know. But the fan knob does not seem to control the blower anymore ?
#15 of 22 Re: No power/air to rear heating/AC 2003 MDX touring [usalian]
Aug 19, 2010 (3:12 am)
Just trying to help out here. If your front or rear A/C just stops blowing one day and had been cooling fine, then it might be the thermal cutoff inside the transistor assembly, which is a DIY project. There are instructions here, and even better ones at mdxers.org, at the Problems tab. My thermal cutoffs arrived yesterday from Digikey, and after soldering each of them in the assembly, both the front and rear A/Cs are back in business. If you cannot do the soldering, then even replacing the entire assembly will save you a lot of money over having the dealer install it. Hope it works out.
#17 of 22 MDX Heating issue
Oct 07, 2010 (5:06 am)
I have a 2005 MDX and just recently noticed when I put the heat on I get cold air from the front vents but hot air comes from the rear vents, I turned the AC off and it's the same, whether it is in Auto Mode or Full Auto mode? has anyone had this problem