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While the reliability of this vehicle is far superior to the others mentioned above, owing to Mercury doing a lot to solve the transmission failure issues, certain others hold it back. Since some OBD codes are manufacturer-specific, the scanner will be able to give you more accurate information if you enter more details about your Grand Marquis. Parts & Accessories; Car & Truck Parts; Share on Facebook. Bad coil pack (if your engine has a coil pack ignition system). So without further ado, let us begin! In that time, Mercury was known for mid-priced, mid-sized sedans. 2.2 Running Rough However, the relative failure to adapt to the times must not overlook the significant qualities this model holds. Over time dust can accumulate on the fins and reduce the air flow, which reduces cooling performance. It was available in both a sedan and coupe body style. Mercury Grand Marquis AC not cooling - causes and diagnosis However, repairs are generally cheap, and problems do not persist if diligent maintenance is kept. 2003 mercury grand marquis intake manifold recall As mentioned above, the ECM controls the engine timing, and air/fuel ratio. Cracked cylinder heads allow engine coolant to reach the combustion chamber and burn. And the best part is, Jerry will do all the work for youbecause. This material may not be reproduced without the author's consent. Failure of the planetary gear assembly may cause a grinding/whining noise, strange vibrations, sliding, and perhaps a loss of reverse gear in some 2008-2011 model years of Grand Marquis. Had transmission rebuilt (Pro).My problem is that when it gets around 35, 8L90E Specs, Performance, and Identification, TH400 Transmission Specs, ID, and Common Problems, Mercury Mariner: Bad ECM Symptoms + Diagnosis, Lincoln MKX: Bad ECM Symptoms + Diagnosis, Mazda 6 P0320: Meaning, Causes, & Diagnosis. While some miscellaneous repairs improved reliability, the internal design flaws of the vehicle ensured that problems such as transmission failure and sensor mishaps plagued the vehicle and needed repairs. In any case, it is advisable for laypersons to visit a workshop. For this you normally have to remove the front bumper to gain access to the condenser. However, this is comparatively low compared to other sedans of similar size and purpose. Misfire is present, but no misfire codes are registered in the computer's memory and/or no check engine light (CEL) on. engine wont start when outside is cold, brake lights, blinkers and flashers not working, cruise control has stopped working. Remove the blower motor, typically located under the passenger side dashboard, and inspect the condition of the cage. The Grand Marquis was introduced in 1983 as a replacement for the Mercury Marquis. When looking for the reason, you should always start with the most obvious cause, insufficient amount of refrigerant.