I have a 03 MDX and the AC suddenly stopped working. I have had the ac system vacuumed down and refilled, I have checked the compressor and clutch both seem fine however the compressor doesn't turn on (not getting power). Its not a fuse because I've checked them all, its not the relay under the hood (checked & switched) I have checked the hi pressure switch (seems good). Ive even pulled the blower apart and jumped the thermal switch (no help). I am out of Ideas!!!!!! Can someone lend hand with some suggestions on what else it could be?????

 

I had a similar AC problem with my 03 MDX about 3 years ago. After some research, I brought it to my dealership. They stated that the compressor stopped working. They fixed it for a little more than $400. Later I checked the consumer report and found AC & climate control are weak spots for 03 MDX. By the way, a year later, the fan for climate control was out of order and the dealer replaced it for $200+. These are the only problems with my MDX and overall, I am very happy with it and it still runs like new.

 

You should be getting power to that single pin connector at the compressor and both fans should turn on when you turn the a/c on. If you do, then your problem lies within the field coil (stator) or clutch clearance. The field coil should have continuity between the unplugged connector and compressor body itself. About 4-4.3 ohms.

 

I will check that continuity on the field coil and the body but would that keep the compressor from getting the power from the relay to turn on??

 

No, that is assuming you are getting power at the connector. Are your fans coming on when you turn the a/c on? Jumping the pins at the fuse box wont make a difference if your stator is bad. Don't worry about your blower motor or anything else as long as they were working before your a/c stopped. The lines coming off the compressor are common to leak btw...I'm assuming your system is leak free and filled properly?

 

Nope!
I'm not getting power to my voltage to my compressor.
Yes before I started troubleshooting this I had it vacuumed down and recharged.
Is there a high and a low pressure switch in this system or is the low press. switch regulated through the cpu?

 

Check for voltage at pin 1 of the relay. Remove the relay and check for voltage between the pin 1 and body ground. Below is the orientation of the relay
--------------------1
--------------------2
------------------4 3

 

A common problem for the 03 TL is when the blower motor connector melts. I don't know if it could be related to that but it might help checking it.