2003 Infiniti M45 Climate control problem

[chitownson]

I have a 2003 Infiniti M45 that recently developed a climate control issue. When the car's heating and air conditioning's controls are set to "auto", no matter what desired temperature you set the climate control at, the heater starts up and the fan motor blows at full speed. The air conditioning will only come on if you set the temperature to 60 degrees. The only way to not have the blower fan blow at the fastest speed setting is to put the fan in manual mode. I live in the San Diego area and have had the car to two local, very good mechanics I use for our cars who have looked at the problem. Both have worked on my Infiniti before. Both recommended I take the care to an Infiniti dealer. Obviously, I am afraid of being taken to the cleaners by a dealership.

Has anyone else experienced this problem? What caused it? Any help would be appreciated.

[Double E]

I think I have to agree with the recommendation. I think I heard of this issue happening on another Y34 but forget the diagnoisis. It was a thread about 2 years back.

[chitownson]

OK, so I fixed the problem myself. I have the Nissan - Infiniti Tech manual I bought on CD through E-bay. I used that and put the climate control through the self-diagnosis procedure. It said the in cabin air temperature sensor in the dash panel under the steering wheel and above the accelerator pedal was the problem. Pulled the dash panel and the air-supply hose and wire connecter to the sensor were disconnected. (not sure why.) Reconnected & good to go.

[mgarzaiii]

I am having a similar issue with my 2007 M45. Even when dialling the thermostat to 60, on a cool day (55deg F), i still feel warm air out of the vents. any one else have this happen?