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#1
08-01-2009, 04:18 AM
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1999 Gr Marquis: Air Suspension Warn Light
Mercury Grand Marquis LS 1999 Model [Mfg. Date 9/1998], 4.6L, V8
Normally, when then engine is cranked & running (or simply switched to "run"), the rear air suspension compressor operates for about 15-20 seconds, as it inflates the air bags, then shuts off. Last week, the comppressor regularly began to run for a full minute or-so & then the "Check Air Suspension" warning would come on. I didn't know how to diagnose the problem, and the place I took it to said tha no one can, except for the (damned) dealership. Seems the 2 obvious answers are that an air bag has a leak OR the compressor's going-out (she's got 192,500 miles +/- on her)-- I just don't know which is the problem (or is it something else???) I hear no air leaks , when I turn the eng off, after the compressor has run but, the rear only raises about 1/2 - 3/4 o' the way up. Probably compressor... don't ya' think (???) any diagnostic &/or removal/installation tips? ________ CONVECTION VAPORIZER Last edited by LieutenantCracker; 04-21-2011 at 06:12 AM. 
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#3
08-02-2009, 04:35 PM
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Re: 1999 Gr Marquis: Air Suspension Warn Light
Here are the first steps
 Visual Inspection Chart Restricted suspension movement Excessive vehicle load Cut, severed, or crimped air line(s) Damaged air spring(s) Height sensor damage Height sensor mounted incorrectly, disconnected, or damaged Mechanical Electrical Central junction box (CJB): Fuse 5 (15A) Battery junction box (BJB): Fuse 8 (30A) Loose or corroded connectors Air suspension switch OFF
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#4
08-04-2009, 04:19 AM
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Re: 1999 Gr Marquis: Air Suspension Warn Light
Last edited by LieutenantCracker; 04-21-2011 at 06:12 AM.
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#5
08-05-2009, 12:13 PM
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Re: 1999 Gr Marquis: Air Suspension Warn Light
All wonderful advice but unless you REALLY love the Air Suspension system I'd pull it all and put Coil Springs in and call it a day. You can then clip the wire that comes out of the unit (usually behind the glove box) to the Instrument Panel so you don't have to see the "Check Air Suspension" Light. Just a thought......MB
P.S. I did it on a '95 GM with great results!
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