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It can be issue with faulty motor or its faulty fan control relay. Bother are to be inspected.Test volt at fan relay and fan motor.------------- For more help,i suggest you to go through the troubleshooting links mentioned below:-----Click the link below:------
THE DOOR CATCH HAS A DOUBLE "C" THAT HOLDS THE DOOR CLOSED. FIRST TAKE A SCREWDRIVER INSIDE THE "C". USING THE HANDLE ON THE INSIDE, PULL THE HANDLE AS IF YOU WERE OPENING THE DOOR AND AT THE SAME TIME, OPEN THE DOUBLE "C" WITH THE SCREWDRIVER. I HOPE THIS HELPS. THANKS FOR USING FIX-YA. PLEASE FEEL FREE TO KEEP ME POSTED. GOOD LUCK
If you can locate the temperature switch, looks like a large bolt head with 2 wires on it, bridge the wires on it, and this should make the fan work. If the fan works then this switch is faulty. If the fan doesn't then it could be the fuse, or a broken wire. The fan switch is either on the radiator or on the thermostat housing. If you can get to it easy, short across with a screwdriver.
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.