Questions and Answers
Dodge Dynasty Blower Motor Inop
Q. Hello Vince, Your last assist with the Ford Escort was right on the money (fuel filter) so I thought I'd ask you about another problem, this time on my Dodge. I didn't see this previously addressed in the index.
This is a 1992 Dodge Dynasty, 3.0 liter, automatic transmission and A/C. My problem is the blower fan (A/C) has stopped. There is nothing in any switch position.
It went out last night for the first time. It was running when the car shut off, then a couple of hours later when re-cranked, fan was not on. Driving home, 7 or 8 miles, it came on after a bit, and ran fine today to get to the store. Then, upon re-starting, the car no fan.
I have checked the fuses in the glove box and 50 amp one under the hood. I also pulled the resister block (behind the wiper solution tank) and it looks fine (checked continuity between the proper leads. I knew to do this because two years ago it did the same thing (fan not operating) and I finally located the resister block and one of the coils had a visible broken "coil". Again, this time it SEEMS fine.
I don't SEE any loose or damaged wires (though I did just have a state inspection done earlier yesterday prior to the problem starting. I assume this is just a coincidence at this point(?).
I seem to recall another fuse somewhere inside the dash which may effect this? Though it rather seems unlikely (it came back on???) The main problem is my auto repair book has poor documentation on details like this (often unclear). I guess I'd like your best guess what to check next or if I've overlooked anything simple. Also, if I have to get to anything difficult, the easiest way?
Thanks!
Paul J.
Charlotte, NCA. Best way to troubleshoot this is to start at the blower motor and work back. Do these checks with the key ON and the blower set on HIGH speed.
Check for power at the dark green wire at the connector to the blower motor. There should be power there. If there is, ground the black wire. The blower motor should run. If not, the blower motor is bad. If this is all good, we move back to the resistor.
Check for power at the tan wire (H1) of the resistor. There should be power there. If not, the wire between the blower motor and the resistor is open. If there is, check for power at the gray (H3), light blue (H2), light green (H1) and tan wires (Low). If there is power at all those wires, the resistor is good.
Now check for power at the other ends of these wires. If there is power, then you have a bad blower motor control switch or a broken wire.
The wiring diagram should help you troubleshoot this problem.
