Question about 2000 Mercury Grand Marquis

1 Answer

HEAT/AC blower motor stopped working

The fan stopped working regardless of the speed being set low or high, heat, A/C, vent, etc. I checked all the fuses, took the climate control unit from the dash, checked and cleaned all connections. disconnected the blower motor and measured the voltage. At low speed, I was receiving 2-3 volts and at high fan speed, 10-12 volts. I figured the motor was bad so I replaced it, but got the same problem. I took both the new and old blower motors and applied external battery and both motors worked. I figured maybe the connector itself was bad so I cut the wires and connected directly to the motor and it still did not work. When I checked the voltage with the motor attached, I was not getting any reading. Something is causing a voltage drop when the motor is connected, but I don't know how to proceed?

Posted by on

  • michaelbsc Jun 26, 2008

    My dad's Grand Marquis has exactly the same problem. Blower occassionally comes on, but off most all the time. Blower itself works great when 12VDC is applied directly to the motor terminals. But somehow the controller module is hosed. Problem is, we can't exactly figure out where in the mash of wiring the module that actually controls the terminal voltage going to the motor. Any help would be appreciated. Thanks, MB

  • Anonymous Mar 22, 2014

    ac blower stops working after about 10 so I will turn it off .After a few min I can turn it back on and it works ..plus it's not cooling that good . could being low on freon cause this ?

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Mercury Master
  • 5,568 Answers

It's even odd that you were getting a step-type voltage when you first checked.
Many speed regulators are simple tapped resistors with the switch selecting which tap is connected to the motor.
More elegant controls would use a semiconductor (transistor) and a few other components to supply step-variable voltage to the motor.

To determine which is used on your car, you will at least need the electrical diagram for it, preferably an aftermarket service manual - Haynes or Chilton should be available at least in the US and Canada.
Those will contain not only the electrical info you now lack but possibly instructions that will aid in locating the controlling circuit.
I suspect that circuit is faulty; if the resistor type, it will be a device with mulitple taps, if solid state, a few parts on a small board.

Posted on Jun 18, 2008

2 Suggested Answers

  • 3 Answers

SOURCE: heat-a/c blower motor stopped

check for ground going to fan. If there is no ground replace a/c control panel located under radio it what you use to turn on the heater/ a/c

Posted on Aug 27, 2008

  • 1 Answer

SOURCE: Climate Control Blower motor stopped working

I had the same problem with my 2000 Mercury Grand Marquis. I ended up replacing the blower and the resistor which is on the passenger center side of the firewall tucked in where it is hard to get to. Everything worked fine for about two years. It just went out again here about a month ago. I am going to try to replace the resistor again, but I am wondering if it doesnt have something to do with the climate control switch. I do not want to replace the same part every year or two, so if anyone has a idea of what could possibaly be the bigger problem, please let me know.

Posted on Nov 22, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Blower doesn't work w/heat setting


Some cars feed the high speed on dash fans thru the ignition switch. So it will only work at low speed for heat and AC..

Jul 01, 2016 | 2002 Kia Sportage

1 Answer

Blower motor doesn't pump well even the fan switch on high


sounds like blower bearings are dried out and will eventually lock up the blower..sometimes you can spray wd40 in the blower bearings and it will work fine for a while.. also check vacuum controls to the baffle dors in the ductwork..may have some leaks there.. should hear a slight hissing if really bad..repost findings

Feb 09, 2013 | 2005 BMW 545i

1 Answer

Air conditioner wont turn on


It might be the fuse for the AC compressor. Check to make sure the blower motor/fan is working by putting it on heat, or vent and adjusting the level from low to high (not temperature). Fan speed. Hope this gets you started.

Apr 03, 2010 | 2006 Hyundai Sonata

2 Answers

Heayer doesn't work


The resistors provide resistance in the circuit, dropping voltage to the blower motor to slow the motor speed down. On high, the blower receives full voltage through the blower relay.

If you had High but no other speeds, then the resistor pack is usually the culprit. If you have all other speeds but high, the most common problem is going to be the blower motor itself, relay, or the switch panel.

You can check this by turning the fan speed to "high", unplug the blower motor, and check to see that you have roughly at least 12v at the plug. If you have 12v, that means the switch panel is activating the relay and the relay is working. Over time, heat kills the magnetic properties of the magnets inside an electrical motor. Without enough magnetic energy, you may not get enough opposing force to spin the rotor full speed when the windings energize, but still enough to spin at lower speeds.

Another thing you can check is the connector at the blower motor and the switch panel. Sometimes these will heat up, start to deform, and cause a bad connection. The bad connection may be able to handle the lower current draw on low speeds, but the higher resistance from the bad connection won't be able to handle the higher current while in the full speed position.

Hope this helps, keep me posted. be glad to help you get your heater working again soon.

Jan 07, 2010 | 1995 Chevrolet Tahoe

1 Answer

Car heat blower is not blowing heat/air into the car


it's either a fuse or it's a bad blower motor, it could be a bad blower motor resistor but usually you'll get either high or low only, so if you have nothing on any speed, high low etc, and all the fuses are ok chances are it's your blower motor.

Jan 16, 2009 | 1999 Audi A4

1 Answer

2001 BMW 330i..Fan for AC/vent not working?


it's either a fuse or it's a bad blower motor, it could be a bad blower motor resistor but usually you'll get either high or low only, so if you have nothing on any speed, high low etc, and all the fuses are ok chances are it's your blower motor.

Jan 16, 2009 | 2003 BMW 325

1 Answer

No air/heat from Vents in 89 delta 88


1996 olds lss .no heat from vents which seem blocked.The fan runs

Dec 19, 2008 | 1989 Oldsmobile Delta 88

1 Answer

Heat-a/c blower motor stopped


check for ground going to fan. If there is no ground replace a/c control panel located under radio it what you use to turn on the heater/ a/c

Jun 04, 2008 | 2000 Mercury Grand Marquis

2 Answers

Climate Control Blower motor stopped working


I had the same problem with my 2000 Mercury Grand Marquis. I ended up replacing the blower and the resistor which is on the passenger center side of the firewall tucked in where it is hard to get to. Everything worked fine for about two years. It just went out again here about a month ago. I am going to try to replace the resistor again, but I am wondering if it doesnt have something to do with the climate control switch. I do not want to replace the same part every year or two, so if anyone has a idea of what could possibaly be the bigger problem, please let me know.

May 29, 2008 | 2000 Mercury Grand Marquis

Not finding what you are looking for?
2000 Mercury Grand Marquis Logo

490 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercury Experts

yadayada
yadayada

Level 3 Expert

61168 Answers

Fordexpert

Level 3 Expert

5331 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Are you a Mercury Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...