20 Most Recent 2003 Mercury Grand Marquis Questions & Answers


Check the fusible wiring link near the battery and fuse box. Sounds like it has burnt.

2003 Mercury... | Answered on May 22, 2017


Does your vehicle have manual or automatic climate control ? You system is stuck in floor an defrost mode ?

03 mercury grand marquis hvac air flow .-13qahwfdndst2y1hypmr2cdq-4-0.gif Item Part Number Description 1 18A318 Vacuum control motor-floor/defrost door 2 - Defrost air flow 3 18A478 Floor/defrost door 4 18476 Heater core 5 19860 Evaporator core 6 19805 Blower motor 7 - Outside air inlet 8 19A813 Air inlet door 9 18A318 Vacuum control motor-air inlet door 10 - Recirculated air inlet 11 18B545 Temperature blend door 12 18A559 Panel door 13 - Panel air flow 14 18A318 Vacuum control motor-panel door 15 - Floor air flow 16 - Vacuum from the engine intake manifold 17 19A563 A/C vacuum check valve 18 19A566 Vacuum reservoir tank and bracket 19 19980 EATC control
Pull the control panel an check for vacuum

vacuum lines hvac 03 grand marquis-13qahwfdndst2y1hypmr2cdq-4-2.gif Item Part Number Description 1 White Air inlet door 2 Yellow Floor/defrost door 3 Red Floor door 4 Blue Panel door 5 Black Source vacuum 6 - Not used


VACUUM APPLICATIONS CHART-ELECTRONIC AUTOMATIC TEMPERATURE CONTROL Switch Port Vacuum Harness Hose Color Func- tion Manual Override Selector Buttons OFF MAX A/C NORM A/C VENT FLOOR FLOOR/ DEF DEF 1 White Air inlet 2 Yellow Floor/ panel (partial) 3 Red Full floor 4 Blue Panel 5 Black
Source

2003 Mercury... | Answered on May 21, 2017


You could have a defective water pump.

2003 Mercury... | Answered on Apr 22, 2017


In the UK we would say 'have the car tracked' .. the wheel alignment checked and adjusted, which is a relatively straightforward and easy job.

However, be aware that there are other causes of tyre wear which isn't rectified by having the wheels aligned.

A bent or damaged steering arm can cause tyre wear. I once owned an old Mercedes that quickly wore one front tyre. Despite having the wheels tracked - aligned - three times, the tyre still wore. It wasn't until I looked under the car myself and found a damaged steering arm ...

A worn ball joint or worn/soft rubber bush can cause tyre wear. Having the wheels aligned cures nothing without first identifying the fault. I own a 1998 Jeep Grand Cherokee which, I am aware, has worn rubber bushes in the front steering/suspension set up. The front tyres wear badly, caused by the worn bushes. The tyres need replacing soon anyway, but I'll wait to get the tracking-alignment- done until after I've replaced the rubber bushes/tyres.

You've had wheel alignment done a couple of times and the problem of worn tyres is still there. It's not the wheel alignment at fault .. there's some other reason such as worn ball joint/rubber bushes or maybe impact damage to a steering arm.

The best option is to get a workshop to put the car up on a hoist for inspection. Tell them that wheel alignment ISN'T the cause of your uneven tyre wear. Any half-decent workshop should be able to find the cause within a few minutes.

A car which has suffered severe side impact - and has been repaired - can have a twisted/misaligned body. This too can cause uneven tyre wear

2003 Mercury... | Answered on Mar 07, 2017


many are built into the back window glass with the defrosting wires

2003 Mercury... | Answered on Feb 25, 2017


No relay , the lighting control module controls the flashing !

2003 Mercury... | Answered on Jan 15, 2017


Could be the mass air flow(MAF) sensor. Unplug it, see if it keeps running. Unplugging it throws the PCM in default mode. Before replacing it, clean it and the throttle body with brake clean. Spray down the sensor and use a tooth brush on the throttle. Clean were the inside plate seats, top and bottom. After that if it still dies( I would put t on a scanner and read codes first) , replace the MAF. Ford did have MAF sensor that wouldn't pop a code, but were out of perimeters. Leaving it unplugged will result in really bad fuel mileage and take a toll on the catalytic converters.

2003 Mercury... | Answered on Dec 13, 2016


Could be a grounding issue , instrument cluster and the windshield wiper motor an switch share ground 201 . lose connection possibly . Pull the driver side left kick panel and look for wires screwed or bolted fast to the car body

2003 Mercury... | Answered on Dec 12, 2016


many mechanics drive them or press them out .

2003 Mercury... | Answered on Sep 08, 2016


Check the fuel pump and replace the fuel filter, dump some fuel injector cleaner in there. Take the air cleaner cover off, replace the air filter, clean and prime the carburetor with gas. If it still won't start, you've probably got a carburetor issue or a fuel line blockage.

2003 Mercury... | Answered on Aug 13, 2016

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