03RAM2500

My ac would not work (it worked fine yesterday until I parked it) on the way to work this morning. I can hear the compressor kick on but the fan will not engage and blow on any setting. The fan does not blow any air on defrost or any other setting either. I did not have time to look for a blown fuse (if there is one for the fan) or loose wire this morning. One other thing, the light for the ac stays on even after I turn the switch for the fan off. Anybody had this problem? Where should I start trouble-shooting this afternoon?
Thanks

03RAM2500

OK, I replaced restrictor/relay located beside the blower ($70) because I was reading 12.6v at the plug for the blower. I also took the blower off and straight wired it to my battery-it worked. My fan still does not blow at any speed. I am at loss now for what to try next. I replaced the ignition switch last summer. Any ideas- this 100degree heat is killing me with no air.

Spooler

You have one or two things that may be wrong. Your wires coming from your ignition have gotten hot and melted inside the plug or you have a bad ignition switch. Have had several folks on here post about that issue. The power for the fan comes from the ignition switch. Take the cover off of the steering colmn and take a look.

EDR

Just surfing through the discussion, but couldn't the fan / blower (speed selector) switch itself be bad?

Just a thought . . .

Spooler

It could possible be but it is not. What I stated is 99% of the problem. He will find it, you'll see.

03RAM2500

Thanks spooler. I wish I had seen your post before I traced the wires back to the column. There is a harness plug at the base of the steering column that was a little loose. I was attempting to check the voltage on one of the wires at the column while I had the switch on and when I wiggled it the fan started working. Just for future reference, if the ignition switch is bad, you will still have 12v of power at the blower motor itself. Im not sure why it has power to it at all times but it does when the ignition is in the on position. This is why it fooled me into thinking the switch was good. Thanks again for the help, I just wish I found this before buying the $70 resistor that the dealer recommended.

Spooler

No problem, just check the connector to make sure it isn't loose. I have only had one guy that had a bad ignition switch here on DTR. I guy on here found that issue about 2 yrs. ago during the dead of winter somewhere from up north. How they control the speed of the fan is with the switch and the dropping resistor to ground depending on what postion you have the switch in that puts resistance after the blower motor to ground.

03RAM2500

Yeah, that was my next step taking the steering column apart. I just didn't think it was my ignition switch because I replaced it last summer. Like I said, the constant power to the blower is what threw me off track. Thanks again, I wont be sweating tomorrow.