2001 Dodge Ram My AC blower motor

DRC348

MEMBER
2001 DODGE RAM
120,000 MILES

Sometimes I get in the truck and crank it and the blower works ; sometimes it does not, usualyy when I need it the most!
I can hear the comrpessor cycling, I had a newe control unit put in a while back because I only had a high speed, now when it works I have all the speeds. I read somewhere that if you hear a ticking sound the blower is going out. I hate to buy another motor and install it and find it was not the issue. Could it be the resistor block or is that inside that control unit that was changed out. I checked the fan fuse, seems OK, swapped the fan relay with and identical one beside it, didnt seem to make a difference, Auto Zone says a loose connection and it may be, I have yet to pull the unti out and see, but I figured that you may have seen or dealt with this beforte, surely someone has. Please help. Dont mind buying the parts, just need to know which ones to buy ! Thanks to all. Dave.

1 Reply

CARADIODOC

MECHANIC
33,723 POSTS

The power module would be my first suspect but since it was already replaced the next suspect would be the motor itself. Worn brushes will make intermittent contact but the clue is the motor should start working after you hit a few bumps. You can also try banging on the motor to see if that will get it started.

Measure the voltage between the two wires. If you find 0 volts, don't overlook burned contacts in the ignition switch or two overheated terminals in its connector. There was a modification to install a relay to take the high current load off part of the ignition switch but at some point that relay got incorporated into the under-hood fuse box. Look for a relay labeled "Accessory" or something like that. If you find one, switch it with another one like it.