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Mercury preventive maintenance repair questions and answers

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  • Keithbaby
    Keithbaby - 2005 Mercury Sable - Preventive Maintenance - 10/29/2011
    AC was blowing cold then started blowing warm air - told clamp broken -need 'AC HARNASS'?
    AAmco in Richardson "repaired" AC 1yr and 4 days ago -yesterday stopped blowing cold for 4th time -told it was broken AC harness/clamp -compressor plug will not stay in. AC blows but warm, musty air. Have checked with 2 Ford dealerships -NAPA -lkq -autozone and ...
  • pezza
    pezza - 1996 Mercury Sable - Preventive Maintenance - 10/25/2011
    Headlights and wipers don't work all the time. The high beams work if the control is positioned just right.
    could the control on the steering colum also control the headlights even though the light switch is on the dash? You have to push back the control to put on the high beams.
    • theoldstoryteller
      10/25/2011 theoldstoryteller
      It sounds like you need to replace that switch.
      10/29/2011 rdoss
      replaced dash switch , marker lights (orange on side) work still no headlights
  • rscottjr1987
    rscottjr1987 - 1993 Mercury Cougar - Preventive Maintenance - 10/24/2011
    What Could drain the battey on my car?
    I have put a new battery in the car, I have checked the alternator, which is good. But the battery keeps losing its charge.
    • Bill
      10/16/2011 Bill
      How long does it take to loose it's charge? And how did you check alternator?
      10/17/2011 rscottjr1987
      I checked the alternator by disconnecting the battery while the car was running, and so far it hold a charge for about 24 hours then its dead, I also did a ground test at night. The ground sparked meaning that something is grounded, but i don't know what. This is what im trying to figure out. Thanks
    • Bill
      10/24/2011 Bill
      Actually this means that you have a drain somewhere whether it is a glove box light a trunk light a under hood light or a dome lite. And try not to test alternator in this fashion in the future you may blow out a trisister diode if not careful on these newer alternators. also check if possible with a ampmeter when neg term disconnected to see what the draw is.
  • fundwayne
    fundwayne - 1998 Mercury Sable - Preventive Maintenance - 10/23/2011
    I have rust ONLY under my car,what can i do about this,before it causes damage to the car?
    the car from front to back is brown underneath,no holes yet.
    • Jimm
      10/23/2011 Jimm
      Sand blast rusted areas, prime and paint. If there are any holes, fix holes first.
  • mdubbwa
    mdubbwa - 2003 Mercury Grand Marquis - Preventive Maintenance - 10/19/2011
    I cant get any heat,can i have a bad heater valve
    i have electronic heater controls
    • Spoon Sports
      10/19/2011 Spoon Sports
      Assuming you mean that your A/C works fine and the only problem is the air being blown out is not warm as it should be on heat, could be a couple of things.

      Valve not sending coolant to heater core. To check this just warm the car up, turn on the heater, and pop the hood. Find where the heater core hoses connect at the firewall. Feel each side (in and out), they should both be very warm. If not very warm, your heater core is not getting any heated water to share with you in the cabin. Follow the hoses from the firewall to wherever they go. If there is a device connected inline, feel both sides of it. If the 'other' side is hot, the valve isn't turning on. This is what you hope the problem is, cheap and easy.

      Blend door not operating properly. This is the flapper door within your heater/AC box that puts air through the heater core or the AC core. Checking or fixing it means removing the dash, which isn't any fun. Hope it's the valve above.
  • Steve
    Steve - 1999 Mercury Sable - Preventive Maintenance - 10/17/2011
    Where is cabin filter?
    Cabin filter
    • Spoon Sports
      10/17/2011 Spoon Sports
      Pop the hood and look at the passenger side near the firewall. Remove the black plastic piece near the windshield. It has a few clips that can be pried off with a flat screw driver. Remove the two Phillips screws and pull out the second plastic shield. The air filter is triangular in shape and fits into a space in the corner. Replace the filter and then put the two shields back on.
      The filter is located under the hood, just in front of the windshield on the passenger side under the cowl grille. The steps you would follow are:
      1- Open the hood. The filter section is on the passenger side.
      2- I removed 3 push-on- clamps to open the grille. I found it was filled with trash. Clean out debris.
      3- Unsnapped (the best I can describe it) a part that held the filter down and then remove and relpace the filter.
      5- Then put everything back together.
  • jdl
    jdl - 1998 Mercury Tracer - Preventive Maintenance - 10/16/2011
    Number under your picture
    What does that number mean, if anything? I was stuck at 140 for a couple of days, now the number is going down? thanks
    • jdl
      10/15/2011 jdl
      I looked at the monthly post count, that seems to be correct. How does anybody get 800 posts in two weeks, If I was reading that correctly? my goodness.
      11/24/2011 CVO
      Master jdl. Happy Thanksgiving to you and family.
      11/24/2011 jdl
      Happy thanksgiving to you and yours.
    • CVO
      10/16/2011 CVO
      The system may have a glitch and that may caused a corruption in the network.
      10/16/2011 CVO
      Correction.............that may caused a corrupted files in the network.
  • Judi
    • Spoon Sports
      10/3/2011 Spoon Sports
      Spoon Sports
      10/3/2011 Judi
      Thank you sooooo much! Now all I have to figure out is the size lug nut I have,lol.
      I think people who use this site know alot more about cars then I do..but I'm determined to do this and I appreciate your help. Thanks, Judi
    • Spoon Sports
      10/14/2011 Spoon Sports
      No worries and good luck....i know you can do it
  • Deb Wells
    Deb Wells - 2001 Mercury Sable - Preventive Maintenance - 10/11/2011
    Squeaking coming from the engine
    Just replaced the serpentine belt (3) weeks ago.
    • yboy82
      10/11/2011 yboy82
      Try to check the condition of your serpentine belt and check the pulleys (might be misaligned/damaged).
  • Wendy
    Wendy - 2000 Mercury Cougar - Preventive Maintenance - 10/2/2011
    What would cause flashers to stop working? Fuse? And when is it located?
    • yboy82
      10/2/2011 yboy82
      Did you already check the flasher relay? You should remove the steering column cover and the flasher relay should be located underneath the turn signal.
  • tofoxer
    tofoxer - 2007 Mercury Mariner - Preventive Maintenance - 9/29/2011
    The horn blares with the lights on but not with high beams on
    0 answer
  • Ken
    Ken - 2000 Mercury Grand Marquis - Preventive Maintenance - 9/23/2011
    How do I replace lower radiator hose on my 2000 Mercury Grand Prix LS 5.0 8 cyclinder?
  • Beverly
    Beverly - 1991 Mercury Cougar - Preventive Maintenance - 9/9/2011
    Failed emissions.High Co
    • Spoon Sports
      9/9/2011 Spoon Sports
      Below are common failures which are likely to produce high Hydrocarbon HC. Hydrocarbons are basically raw fuel, otherwise known as Gasoline. High Hydrocarbon (HC) emissions are almost always a sign of poor fuel ignition. However, it's not always that the engine's ignition system is responsible for high Hydrocarbon emissions. Read on.

      1. Improper Ignition Timing - Engine ignition timing is measured in degrees before or after Top Dead Center (TDC). Example of an ignition timing failure would be in the case where an engine's ignition timing is required to be set at 10 degrees Before Top Dead Center (BTDC) and instead is set to 15 degrees BTDC. This fault will not only cause a smog check "functional failure", but will increase Hyrdocarbon (HC) emissions as well. California allows 3 degrees +/- off of the manufacturer's required setting. Note: Late model vehicle's may not have a distributor, and therefore no timing adjustment will be needed. On these engines timing is electronically controlled by the ECU (Engine Control Unit).

      2. Defective Ignition Components Your vehicle's ignition system consists of the ignition coil/s, distributor*, distributor cap*, distributor rotor*, ignition wires, and spark plugs. If any of these components are defective the engine will produce high hydrocarbons. A common reason ignition components perform poorly is due to carbon build-up. High ignition voltage traveling through the air pockets within these components form carbon. Carbon acts as an insulator between paths of electricity, decreasing the energy required at the spark plug to ignite the air/fuel in the combustion chambers properly. *Distributor-less engines do not have these components.

      3. Lean Fuel Mixture - Any condition which will cause unmetered air to enter the intake manifold, and ultimately the combustion chambers, will cause high hydrocarbons (HC). This condition is called a lean miss-fire. Such faults as vacuum leaks and gasket leaks will cause lean fuel/air mixtures. Broken, disconnected or misrouted vacuum hoses will do the same. It is also important to note that many engine components rely on engine vacuum for proper operation. If any of these components are defective, externally or internally, they may cause large vacuum leaks as well. A good example of such a component is your vehicle's power brake booster.

      Which Type Should I Choose?

      * Failed High HC Emissions
      * Failed High CO Emissions
      * Failed High NO Emissions

      4. Defective Catalytic Converter - A defective catalytic converter (CAT) may be responsible for high HC, CO, and NOx emissions. The Catalytic Converter, commonly referred to as the CAT is a component designed to continue the combustion process within itself and emit a more thoroughly burned and less harmful emissions containing exhaust. The most accurate way to find out if your vehicle's CAT is working efficiently is by using an exhaust gas analyzer. Unfortunately this tool is fairly expensive. Testing the CAT should be conducted at a smog check repair station.

      Some obvious symptoms of a bad CAT could be any of the following:

      a. Major loss of power over 15-25 mph. This may be an indication that the catalytic converter is plugged up and restricting exhaust flow.

      b. Strong sulfer or rotten egg smell emitting from the exhaust on an otherwise good running vehicle. This may be an indication that the Catalytic Converter isn't burning fuel completely, instead storing it, then releasing it as hydrogen sulfide.

      c. Loud rattle being heard from inside the CAT. This may indicate a broken Catalytic Converter substrate. You may want to insure this sound is not due to loose exhaust components, i.e. broken muffler flanges, loose exhaust pipes, loose or cracked exhaust manifold.

      5. Defective Air Injection Components - Faulty smog pump and related emissions system components will cause high HC. The air injection system is designed to introduce additional oxygen, after the metering system, to the engine exhaust as it exits the exhaust manifold, or directly before it enters the Catalytic Converter; thus burning whatever remaining fuel (HC) in the exhaust completely.

      6. Low Cylinder Compression - This fault is one of the less common high HC causing problems we encounter. Reasons an engine may have low or no compression in one or more of its cylinders may include things such as burned intake or exhaust valve/s, defective valve guides and/or seals, defective piston rings, and burned head gasket/s. A wet/dry cylinder compression test will diagnose this fault. More then often if such a problem exists it will be very apparent. You should notice rough idle.
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