Question about 2003 Acura MDX

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Acura MDX A/C won't come on

Problem 1: The rear Air Conditioner went out about three months ago. Dealer told me it was probably a transistor that controls the rear A/C unit. Any suggestions how to get to it?

Problem 2: The front A/C stopped working yesterday. The display on the front dash lights up, but the A/C won't turn on. I checked fuse #3 (7.5A) in the interior fuse box driver's side - checks good with a DMM. The description of fuse #3 is Heater Control, A/C Clutch Relay, Cooling Fan relay. This fuse has to be good because the cooling fan works, but I couldn't find any other fuse with a description "A/C". I checked fuse #3 with a DMM anyway - it is good. Is there a A/C Clutch relay under the hood or another fuse somewhere? It seems strange that the fuse for the rear A/C is 30A (#11 under the hood) and the fuse for the front is only 7.5A.


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  • nitrousbrain Oct 29, 2008

    No front blower, no a/c compressor----compressor kicks on for 3 seconds when turned on, then stays off. Front blower never trys to come on. (Rear blower has normal operation). Installed new front transistor/resistor---same result. Good 7.5 amp fuse. No control over transistor? Full of freon---cools well when compressor jumped. Front blower works when grounded.

  •  john
    john Dec 11, 2008

    This sounds like my problem other than the front ac is fine. The rear heat/ac controls do nothing. What do you think. I just called a dealer and they said a resistor is bad / part 110$ labor 80+ to repair. Should i try to order this or just have them do it.


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I went to an Acura dealer to buy the transistor for the rear A/C unit. The service advisor told me that the problem with the front A/C was probably due to a defective front transistor / resistor. I bought that part too.

The front transistor is located next to the blower motor under the dash on the passenger's side. It is secured by three or four small bolts. The one on the bottom left is very close to the carpet and the most difficult to get off and put back on.

The rear transistor is located behind the carpeted trim panel on the center console (driver's side). The carpeted trim panel is secured by clips only - there are no screws, so remove it carefully starting at the side near the accellerator pedal. Once the panel has been removed, reach inside a small hole in the metal frame to access the rear transistor. It is removed by twisting it and pulling it out. The hole in the frame is small and you might find pliers helpful.

After replacing both parts, the front and rear A/C are working. Apparently these transistors are common failures. If the A/C is out in your Acura MDX and the fuse checks good, a new transistor will likely solve your problem.

Posted on Oct 01, 2008

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Acura MDX A/C Rear A/C section is leaking water. This is not the front A/C Section it is the middle console.

Any questions?

Posted on Sep 19, 2010

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