2003 DeVille base 99K miles, FE1 suspension. Load level compressor running too often. Hoped that replacing the blown out rear shocks would solve the problem, but no. Where do I look now? Is this a DIY issue or do I need a professional wrench?
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Load level compressor running too often
every time you turn the ignition on -
the compressor goes through a self-check -
other than that - the compressor should only run
when a load is added to the trunk or back seat -
that means you have a leak somewhere -
a somewhat common problem is the compressor assembly -
or more specifically - the exhaust solenoid built into the compressor head -
check for codes - you are looking for "C" codes -
C1737 - or C1738 -
there is no "easy way" to check for leaks -
the "best" way is to raise the rear end and support it on jackstands -
remove the rear wheels -
pop off the connecting rod of the ride height sensor off the lower control arm -
turn the ignition on - no need to start the motor -
radio - climate control etc all turned off -
you need a quiet environment -
push the connecting rod UP -
this will simulate a sagging rear end - and will start the compressor -
you can inflate the air bladders with up to 120 PSI -
without hurting them - but you shouldn't need anywhere near that much -
just inflate them until the bladders are very firm when you squeeze them -
next - move the rod DOWN until the compressor turns off -
now LISTEN for an air leak -
HINT - you can use a short length garden hose - or similar - like a stethoscope -
hold one end to your ear - "aim" the other end at other areas along the airlines -
take your time - and be thorough -
if you hear something -
you can use the soap-water in a sprayer to verify the leak -
if you do NOT hear anything - use the soap-water in a sprayer method -
and spray down all the lines - pay particular attention to the connections -
and also where the supporting clips are -
also spray down the bladders -
it is VERY rare - but "new-defects" can happen -
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if the compressor is bad - you have a couple choices -
try "rebuilding" or cleaning the compressor -
a few members have combined parts from several used compressors -
to make up a good working unit -
the other option is to replace it with a brand new one -
DON'T WORRY - you won't have to pay the $800 the dealer wants -
here is a brand new genuine GM 12494809 - $237 - with free shipping -
http://www.ebay.com/itm/Arnott-Air-...Parts_Accessories&hash=item33886103c6&vxp=mtr
or - if you just won't use ebay -
$253 - with free shipping -
http://www.buyautoparts.com/no-ymm-...fno=12494809&gclid=CPyL54a6vL8CFQwDaQodch0AhA