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.
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.
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If like older style vans it will have second compressor at back of vehicle this probably needs a charge or new compressor
Now the other part is if it has running ducts you need to see if any cracked or split from front to back Run snake cam threw air ducts wont cost anything for a look at any mechanic shop Belts barrings and tensioners check out Pull off belt and turn ac by hand if theres resistance replace compressor Your dryer on system could need a clean out and cabin filter
Super easy to fix yourself. Sit in y our backseat and pull as hard as you can on the air cond controls. Pull it straight back and hard enough to make you think it could break - it won't. You'll see the top pops off easily and the bottom needs a little coaxing, just keep pulling it straight back and massage it when it needs it. Once you get that off, there is a little black box right there with a bluetooth symbol on it. The cable is really easy to remove, if you have to use force, you're doing it wrong. There is a little pressure button on the cable that will release it from the unit. That unit is what needs replacing; this is a common problem among MDX's, apparently. Anyway, you can get this part on ebay by searching for "07-11 Acura MDX HFL" without the quotes. They run about $140, it looks like.
I have the same problem with my MDX. I live in the Bahamas and there are no Acura dealerships here. I had two mechanics look at it and they could not fix the problem, so I took matters into my own hands. After checking for blown fuses I did a self diagnosis on the climate control panel, I got a DTC that related to a fault in the blower motor circuit. I went through the step by step diagnosis of the circuit and found that the blower motor was faulty. Acura's climate control has a couple sensor that monitor the blower speed, if the sensor do not detect that the blower is running they will not allow the compressor to run, in essence the rear blower will run but the system will not cool. You may need to replace the blower. The quickest way to check if the blower is faulty is to pull the connector off the blower, turn the iignition on and the ac system on, You should get battery voltage on the connector. If you have battery voltage at the connector and the fan doesn't run the youv'e solved the problem. If you don't have voltage at the connector with the ignition switch on and the ac system on you problem could be the front blower power transistor. If you need diagrams and how to retrieve self diagnostic DTC contact me: [email protected]
this is easy just remove the plastic panel under the dash on the right side (kick panel) it just pulls off. then remove the wiring connector and tube from the blower motor and remove the three 8mm screws and pull the motor down to clean it out heres a picture of the location http://senduit.com/0274d6