Question about 2000 Mercury Grand Marquis

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2001 mercury Grand Marquis temp gauge reads cold all the time, jump switch goes all the way up . put in new switch still have same problem

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Replace the temperature sending unit. Don't confuse it with the coolant sensor, it's the sending unit that's bad.
The sending unit usually has a one wire connection, and the sensor has a two wire connection. I don't have my manual at the moment, so I can't tell you exactly where the unit is.

Posted on Nov 18, 2009

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U need to replace the engine thermostat, it is stuck open and the coolant never gets hot.

Posted on Nov 18, 2009

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1 Answer

What could cause the temp gauge to not register after replacing decending unit, thermostat, water pump & antifreeze?


Bad ECM, bad wire from the ECM to the instrument panel, and a bad motor for the temp gauge.

Feb 24, 2015 | 1999 Mercury Grand Marquis

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Heater control


Run self test on heater control head. With the key press off and floor buttons at the same time for 2seconds then release and press auto button for a second.this will put system into self test.if no code all the blend door actuators are ok and I would think vacuum leak from main vacuum, black line going through fire

Mar 01, 2014 | 2001 Mercury Grand Marquis

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1994 Mercury Grand Marquis temp gauge reads hot


Check sending unit, Ford/Mercury put out a TSB, technical service bulletin : Article No. 95-13-2 07/03/95, on erratic temp sender units.
You troubleshoot as follows :
  1. Turn ignition switch to On or ACC position.
  2. Connect a 10 ohm resistor between gauge lead and ground. The centerline of pointer should fall within the band around the H mark.
  3. Connect a 73 ohm resistor between gauge lead and ground. The centerline of pointer should fall within the band around the C mark.
  4. If gauge tests within calibration, replace sender.
  5. If gauge is out of calibration, replace gauge.

Mar 16, 2013 | 2000 Mercury Grand Marquis

1 Answer

2001 mercury grand marquis reading code p305 misfire, spark plugs and coils changed


If you changed the #5 Coil then the code was wrong

You get lots of wrong codes on a ford, as a bad coil
spikes the pcm when grounding out to fire the coils
secondary side

Try putting the old coil back & walking the new one to
another cylinder,may take many days & many miles of
driving to get it fix,but better than a shop guessing, because
they hate fords

Jan 24, 2013 | 2001 Mercury Grand Marquis

1 Answer

2001 mercury grand marquis 15 amp fuse blows blows when put in drive fuse controls speed ometer fuel gauge oil pressure gauge amp gauge


Check under the dash at your Brake pedal interlock switch. It is timed with the gearshift Interlock and Ignition switch. This switch usually gets hit by feet and dislodged or broken. When you shift out of Park, the switch is toggling to a broken piece and shorting out.

The brake interlock switch is at the top half of the pedal lever. The other part of the Interlock uses a rod or cable in the steering column Ignition switch and mates with the shifting mechanism.

Jul 03, 2011 | 2001 Mercury Grand Marquis

1 Answer

Temp gauge stopped working. Replaced temp sensor on top of engine. Any other suggestions?


Im assumint that you have any fault code stored there, what code was set? Where the Temp gauge and PCM now share a temp sensor, an early guess would be a wiring issue...

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Keep us updated.

Nov 09, 2010 | 2001 Mercury Grand Marquis

1 Answer

No heat. has a new thermostat. engine stays cold .


need to check to see if radiator is circulation the water . hose good make sure their no soft an sucking shut especaily the bottom hose . you can get a temp gauge take radiator cap off ,let warm up til thermostat opens put gauge in radiator see what temp. is . (wife got meat or candy temp gauge this will work) last it could be heater core bad.

Nov 02, 2010 | 1995 Mercury Grand Marquis

1 Answer

I got a 1988 mercury grand marquis LS that just about stalls when you drive it cold and put it into park. Cold meaning the oil is cold not the weather.


it doesent mean the weather it works the same if the engine hasent been rann for awhile its not at operating temp try running it till it reaches normal temp if it does not stall its your cold oxigen sensor

Sep 30, 2009 | 1988 Mercury Grand Marquis

1 Answer

Mercury grand marquis,ls,2001. the ac blower is not working. I jumped the fan direct from the battery and it works. How can I by pass the climate control and install a manual switch. I beleive the climate...


Have you checked the fuse under the dash. You can run power directly from the battery as you did to test the blower just make sure you use a high amp rated switch and make sure you install an inline fuse rated no more than ten amps if you use say 14 guage wire. Let me know how it goes good luck.

Mar 15, 2009 | 2001 Mercury Grand Marquis

1 Answer

Where is the temp. sender on a 1994 grand marquis


it is located on top of the intake manifold right behind the thermostat housing where the upper radiator hose goes to engine

Mar 03, 2009 | 1994 Mercury Grand Marquis

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