20 Most Recent 2003 Mercury Grand Marquis Questions & Answers


The average person does not have pressure gauges or the specs for power steering pressure. These readings would show if the power steering pump pressure is correct and then pointing to the problem being inside the rack and pinion unit.

You may be able to take the pump into a hydraulic repair shop and have its performance taken. Although they may not know what rpm your pump needs to be turning for a given pressure performance.

Could be a procedure for air bleeding is special. There was a procedure for Ranger or Chevy S10 type trucks which had strange elevation requirements for fluid to be "burped" with hoses hung higher than pump case. Once air escaped higher elevated hose, system was primed.

Make sure of simple things, like fluid is correct type. Maybe some other Expert will supply more answers.

2003 Mercury... | Answered on Jan 17, 2018


  • Insufficient, erratic, or no heat
  • Low engine coolant level.
  • Engine overheating.
  • Plugged or partially plugged heater core (18476).
  • Temperature blend door binding/stuck.
  • Temperature blend door actuator (19E616).
  • Incorrect heater control valve (18495) operation.
  • Go To Pinpoint Test I .

Are the heater hose's going through the fire wall hot ?
I2 CHECK FOR HOT WATER TO THE HEATER CORE INLET HOSE WARNING: The heater core inlet hose will become too hot to handle and may cause serious burns if the system is working correctly. Allow the engine to reach normal operating temperature. Feel the heater core inlet hose.
  • Is the heater core inlet hose too hot to handle?
Yes GO to I4 .

No REFER to Section 303-03 to check cooling system function.

2003 Mercury... | Answered on Jan 06, 2018


This vehicle does NOT use a heater control valve. Coolant flows to the heater core at all times. Temperature is regulated by the blend air door and blend door actuator. Locate the blend door. Remove the actuator and open the door by hand. If you get heat, the actuator or the control head is bad. FWIW, the actuator is the most likely cause

2003 Mercury... | Answered on Jan 06, 2018


Under the car. You need a tool and you need to release pressure before changing.

2003 Mercury... | Answered on Dec 06, 2017


check the back of the radio, make sure than the antenna, connector is plug into the radio, if it is, then replace the radio.

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


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

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