Question about 1986 Mercury Marquis

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2000 grand marquis air/heater fan internmitent. Check electric, but it all good. It works most the time, but sometimes quits for a day or two and then starts up again.

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Sounds like you need to replace blower motor speed cotroller, located underhood right rear of engine on A/C / Heater case on firewall, rectangular in shape. When fan stops working tap on controller, fan should come back on then you will know that is problem. Have seen this many times on this vehicle. Hope this helps, have a good one!

Posted on Jul 26, 2009

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Posted on Jan 02, 2017

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I need a diagram for fuse box for 2000 Mercury Grand Marquis. The air conditioner, heater and interior lights don't work


You can get free diagrams at www.bbbind.com/ . home page click on technical information ,the click on tsb's an free wiring diagrams . On the next page go to the bottom an click i agree . Next page click wiring diagrams then enter your vehicle info . year ,make , mode ,engine size. under system click electric distribution . Subsystem fuse panel . Good luck .

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2002 mercury maRquis hvac not blowing cool air What could be wrong ? Fuses o k control switches don't seem to be working right code is 024 025 .


Check the AC charge. If it's low, add refrigerant. If the fan is not working, you'll need to check the fan and replace if it went bad. typically, a fan starts to squeal before the bearings give out and the fan quits working.

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2000 Grand Marquis .Heater continues to heat .after temperature is reached.


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Mercury Grand Marqui fan stopped working


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Cannot adjust temperature on the heat & air, 2000 grand marquis, cannot get any heat, air cond temperature cannot be adjusted, it stays on cold at all times


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Oct 22, 2011 | 2000 Mercury Grand Marquis

1 Answer

Air condition and heater will work but the blower fan will not come on.2000 Mercury Grand Marquis


First, check your fuses. The part that goes out the most is the blower motor resistor. This part is under the hood. You start at the blower motor and trace its wires across the Firewall until you see a plug-in. This plug-in has 2 screws and 1 electric connector. You can try tapping on the connector and see if the blower starts working.

The part itself is the size of a pack of cigarettes with 90% hidden in the ductwork. There may be a heater line coming off the motor and it will be in the way when you try to remove the part. You best bet is to work on a cold motor, remove the connector, and test the new replacement part by plugging the connector into the part before installation.

When you find that the new part works, you can set it aside and remove the mounting screws on the old part. You will need to pull the rear hose for the heater out of your way temporarily. By working on a cold motor and leaving the hose removal for last, you will minimize the loss of antifreeze and the mess that follows. Then just switch parts and all should be like new.

Dec 28, 2010 | 2000 Mercury Grand Marquis

2 Answers

Air condition blower doesnt work in 2003 mercury grand marquis


Removal & Installation To Remove:
  1. Disengage the wire harness connectors from the retainer.
  2. Disconnect the blower motor electrical connector.
  3. Remove the hose.
  4. Remove the screws and remove the blower motor. CAUTION
    Clean any corrosion from the blower motor shaft before removing the fan.
  5. Remove the wheel from the blower motor.
To Install:
  1. Install the wheel on the blower motor shaft.
  2. Place the blower motor in the housing and install the screws.
  3. Connect the hose to the blower motor.
  4. Connect the electrical connector.
  5. Install the electrical connectors in the retainer.
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Jul 30, 2010 | 2003 Mercury Grand Marquis

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Our heater, and a/c are both out. Have no sound of a fan. We have a 2001 Grand Marqui


If you have Digital controls first check your fuses. Then if they are OK the blower controller is bad. This part is under the hood in the ductwork.

It sticks out of the firewall and usually is behind the engine where a heater hose comes out of the intake manifold. It has 2 screws and 1 electric connector. The only good thing about the whole deal is "When you can get the electric connector off the old part you can attach it to the new part to see if it works".

You can turn on the blower and the fan will work if the controller was the problem. You do not need to start the engine. Then you finish the repair. Most likely the heater hose will have to be moved temporarily and then you can get to the screws and switch the parts.

My best price was $20 at a Salvage yard. Expect much more for a new part and usually $50 for most used parts.

Jan 18, 2010 | 2000 Mercury Grand Marquis

1 Answer

2004 Grand Marquis picked the wrong day for the air conditioner to quit working...it's 94 degrees. The fuse is fine. Oddly....it seemed to have gone out at the exact second that I checked the outside...


A blower control switch for the digital A/C. Mine went out almost the same way, driving along, checked outside temp. and then it started getting warm. No blower, no defroster, not even a trickle of air from the vents.
This part is behind the motor on the ductwork. It is inconveniently behind the heater hose on the engine. It takes 2 screws, about 9mm, and has 1 electric plug.
It is about the size of a pack of cigarettes with 90% in the vent. If you can plug in the new part to the harness you can instantly tell if it is the problem, because the A/C will work. Then remove heater hose and lose some coolant, switch part.
Oddly enough there is a diagnostic in the dash display, but it did not idenify this part.

Jul 17, 2009 | 2004 Mercury Grand Marquis

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