QuestionQUESTION: Hi, my Fifth Ave. blower motor stopped working shortly after I bought it, and I'm having a hard time figuring out why this could be. I have done a 12v test on the motor and it works, I can't seem to find any bad fuses or loose wires, and my voltmeter shows no power at the blower ground on the chassis and only .16 volts at the fan switch. It doesn't work in any positions including high. All wiring that is visible looks to be in great condition. Am I over looking something? I'm not really sure where the wiring leads from the motor, and there on from the climate control. Also, Is the blower resistor part of the climate control? Any idea would help GREATLY! Its so cold outside! lol
ANSWER: Hi Blake,
This is a bit of a challenge. First is this a front or rear wheel drive vehicle?
And is the 5th position in the VIN a "T" which is 'New Yorker'?
And which engine size (L) and is it 2.2 carbureted or turbo charged throttle body injected, of a 2.6L with or without feedback? Believe it or not those have different ac/heater systems!
If it is the rear wheel drive, then I only have the '83 manual to consult.
This evidentally was a transitional time period for Chrysler as I haven't seen diagrams for the HVAC system laid out in this way.
And is the control panel possibly a digital autotemp control type or is it conventional.
Answers to these questions will be very helpful.
Lastly, I am not clear what you mean by the blower ground at the chassis. Wouldn't that have to be 0V or do you mean as measured with the blower ground wire disconnected from the chassis?
Which color wire at the fan switch shows 0.16V?
The blower motor resistor block is in series between the blower fuse and the blower motor and serves as a voltage divider. However usually when it fails it still powers the fan on 'High' but none of the lower speeds. It is a separate part of the system from the control unit, typically.
Roland
PS Thanks for the rating and nomination.
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QUESTION: It is a rear wheel drive and the 5th letter is an F. It is the 5.2L Carb V8. I believe from what I've read that the 83 is the same as the 85. The control panel is a 6 button push setup with a chrome slide lever( ). By the blower ground, I meant the ground point where the ground wire directly off the blower motor mounts to the frame on the passenger side in front of the door. The connector that runs to the climate control is located right by it. I tested the blue w/ white stripe on the back of the climate control, and all the fan switch leads and they all pulled up .16v. And no prob, I think the help you provide is an amazing service, and deserves recognition!
AnswerHi Blake,
The '83 manual covers your system pretty well, I believe. The circuit for the blower is from fuse #4 (30 amp) which should show power on both sides when the ignition is in the run position,
to the 6 push-buttons, 5 of which should send power to the blower speed switch, which in turn has 3 wires that go to the resistor block for high/medium high/medium low choices as well as one wire from all 5 buttons that goes directly to the resistor block so that the low blower is activated when ever you turn on the HVAC control panel. The blower motor resistor block is mounted in the air intake plenum of the overall system (the external air intake duct) which is either found at the firewall of the engine compartment OR at the other side of the plenum in the cabin on the firewall behind the glove box (remove the glove box is the usual way to get to it IF that is where it is.
From the resistor block a dark green wire feeds the required voltage on a dark green stripe wire through a disconnect on the right side cowl (the kick panel by the passengers right leg) to a dark green or dark blue wire to the blower motor. So that incoming wire to the blower motor should always show some voltage (increasing as the selected speed request increases) up to 12V when compared to chassis ground unless the unit is 'off'.
So I would start at the fuse and see if it shows voltage on both sides, then look inside the control panel where you should find again 12v on the incoming brown wire, then check the output white and tan wires which should show voltage when you turn the control on (the white for buttons 3,4,5,6) and the tan (on buttons 2,3,4). There is a 5 wire splice of tan and white wires which you should also verify is showing voltage whenever the unit is on. There is a bit more detail but you have the basic ideas. Somewhere in the path from the fuse to the blower motor you have an 'open'. There is one connection inside the resistor block (between pins 5 and 6 which if open would shut down the blower entirely. Similarly, there may be feed through capacitor on the resistor block's output wire at pin 6 of the resistor block to the blower motor which is open, so check that out as that too would shut down the blower.
Please let me know what you learn.
Roland
PS This is very esoteric stuff about a 26 yr-old system using a 28-yr old manual! I hope this gets you some 'action'.
