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'01 Cadillac Seville STS 146k Miles / '15 Hyundai I20
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Discussion Starter #1 (Edited)
Hey guys,

My hunt for a Seville still continues, and I've stumbled upon a few questions I'm hoping you could awnser them for me.

1. I test drove a 2002 STS with 5 persons in it, after a few miles the message Service Stability Sys showed up. And every time I stopped for a light I could hear the Aircompressor kick in. Am I correct to suspect that the rear shocks are leaking air?

2. I came across 2 2001 SLS's that caught my attention, these cars didn't have the CRVSS system right? Meaning that they are not vulnerable for airleaks? (Taking a look for these cars on friday and saturday)

3. 2001 STS I'm going to take a look sunday, I've got some pictures but I'm in doubt, the rear looks pretty low to me... What are your guys opinion? (Like I said, going to take a look on sunday)


Hope to hear something soon! And I'll keep you guys updated!
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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DJP1990 said:
1. I test drove a 2002 STS with 5 persons in it, after a few miles the message Service Stability Sys showed up. And every time I stopped for a light I could hear the Aircompressor kick in. Am I correct to suspect that the rear shocks are leaking air?
The ELC compressor should run for a few seconds, shortly after key on, as a self test. The only time you should hear it after that, is when weight is added. It should run once to bring the rear to proper ride height, and that's it. If it turns on periodically, there's a leak in the system.

2. I came across 2 2001 SLS's that caught my attention, these cars didn't have the CRVSS system right?
Meaning that they are not vulnerable for airleaks?
You're confusing different systems. All of these cars have ELC (the rear leveling system). CVRSS is a variable damping system. It varies the damping (stiffness) of the shocks/struts, based on driving style/conditions. CVRSS is standard on the STS, optional on the SLS. STSs built on or after 1/15/02 have a different active damping system, MagnaRide. Each system works in a VERY DIFFERENT way, but accomplish the same thing, MagnaRide adjusts faster.

3. 2001 STS I'm going to take a look sunday, I've got some pictures but I'm in doubt, the rear looks pretty low to me... What are your guys opinion? (Like I said, going to take a look on sunday)
It does look a bit low to me.
 

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'01 Cadillac Seville STS 146k Miles / '15 Hyundai I20
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Discussion Starter #3
Thanks for the quick response!

The ELC compressor should run for a few seconds, shortly after key on, as a self test. The only time you should hear it after that, is when weight is added. It should run once to bring the rear to proper ride height, and that's it. If it turns on periodically, there's a leak in the system.
Alright, but does periodically turn on and off result in a Service Stability System?

You're confusing different systems. ...
Ah thanks for clarifying! Always assumed when an STS would hang low, it was because of the CVRSS system was broken.

Though it seems, here in Europe anyways, that SLSs are higher at the rear then most STSs? (What confuses me)

It does look a bit low to me.
Was afraid of that, still taking a closer look on sunday I'll be sure to take some weight with me aswell see if the compressor kicks in more than once. Or is there an easier way of checking?
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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DJP1990 said:
Alright, but does periodically turn on and off result in a Service Stability System?
Ah, I forgot to answer that. No, that's a separate issue. Do you know how to pull codes?

Was afraid of that, still taking a closer look on sunday I'll be sure to take some weight with me aswell see if the compressor kicks in more than once. Or is there an easier way of checking?
The easiest way is to take a friend with you, turn the key to ON or start the car, open the trunk, and sit in the opening. I'd sit there for ~5 minutes or so. Slower leaks won't be obvious, you'd have to sit there, or drive around for a while with weight in the back.
 

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'14 ATS Premium with 3 pedals | Past: '13 ATS Performance & '99 Seville STS
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Thanks for the quick response!


Alright, but does periodically turn on and off result in a Service Stability System?
No. There is a leak in your rear leveling system, and to compensate the leak the compressor kicks in periodically. Seville's computer does not monitor or report problems such as air leaks. You need to pull the trouble codes to see what the main cause of the service stability system alarm is. This alarm, light, or whatever you call it, is a very generic way to say you that something is wrong with your stability system. There is extra and more specific information about the exact cause of this problem stored in the computer, which are called trouble codes. The good news is you don't need a scanner to read the codes. Go to this link and learn ho to pull the trouble codes. Write them and post the trouble codes with their definition. You can find the definition of each trouble code in this link too:

http://www.cadillacforums.com/forums/cadillac-seville-cadillac-eldorado-forum/138258-how-pull-codes-dtcs.html



Ah thanks for clarifying! Always assumed when an STS would hang low, it was because of the CVRSS system was broken.

Though it seems, here in Europe anyways, that SLSs are higher at the rear then most STSs? (What confuses me)


Was afraid of that, still taking a closer look on sunday I'll be sure to take some weight with me aswell see if the compressor kicks in more than once. Or is there an easier way of checking?
As MoistCabbage mentioned, we are speaking about two different systems; 1) Rear auto leveling system (ELC), which adjusts the height of the rear end of the car based on the load on the car, and 2) CVRSS, continuously variable road sensing system, which adjusts the damping ratio of the shocks and struts. Assuming that the STS hangs low, the reasons could be:
1) There is a leak in your ELR system and as a result the rear end hangs lower than it is supposed to be.
2) Your rear springs are replaced by some shorter aftermarket springs.

Because you can hear the compressor kicking in periodically, I am going to say that you have a leak in your auto leveling system.


By the way, I do love that grey STS, and what a nice and classic background!

PS: MoistCabbage beat me on this post! :D
 

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2002 STS/ 1994 STS
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Oh, cool! Headlight washers! I don't think I've ever seen those on this body style before...Hey N*Caddy, here's another project for ya:yup:
 

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1997 Cadillac STS (BOSE w/AUX In, Massage Seats, URPAS, "Z")
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:) Well let me fix the transmission first, the car is in the shop since over 2 weeks and I am reduced to drive rentals. Is a pretty bad situation I am right now.
 

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'01 Cadillac Seville STS 146k Miles / '15 Hyundai I20
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Discussion Starter #8
As for the Service Stability System message, that was on another STS from 2002 (The grey one is 2001 and am going to take a look on sunday)
The man who's selling the 2002 with the message is looking into it and expects to give me an awsner in 2 weeks...

The 2001 STS as shown in the pictures is from a man who works at an Opel, Chevrolet, Cadillac, Corvette and ISUZU Dealership so I'm pretty confident the car should be good... Also asking about the HG and some specialist questions I've became reassured although...
I'm still in doubt about the back-end of the car... We'll see for sure on sunday!
If the ELC is leaking, would this be an expensive fix?

As for the headlight washers, Pretty nifty huh? All the export STS from 2000+ got them! I believe on SLS it's optional as for the 2001 SLS i'm looking at on friday and saturday don't have them.

On top of that, I don't know if you can see it on the pictures but this STS has the Towing-Package!!
But could this be the reason why the back-end sits lower? And I've readsomething about an oil-cooler included in the towing-package, what's up with that?
 

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'01 Cadillac Seville STS 146k Miles / '15 Hyundai I20
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Discussion Starter #11
I'll probably stay away from the 2002 one, who had the compressor kick in every time I stopped and the Stabilty System message...

The 2001 STS I'm gonna take a look on sunday, and yeah I guess I mean hitch?

Anyway here's a printscreen from the option list of the car, I do wonder what the FE3 ( option is SUSPENSION SYSTEM(SPECIAL )(LESS STABILIZER SHAFT) SPL SUSP(FE3) is?

Do you guys see anything interesting in the list?

Thanks!
 

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FE3 is the stiffer suspension system that came standard on the STS. Stiffer coil springs, and thicker anti roll bars.

'01 was the first year for URPAS and HIDs, and that car has both. Also has the smokers package and is Z rated. Not sure how common that is on European cars.
 

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Discussion Starter #13
Alright, nothing special about it really! Still pretty curious as how the (rear of the) car looks in person, I'm taking my dad and girlfriend allong for the testdrive. Make sure if the ELC is working and alright :)

'Smokers Package" were usually standard in Europe, only lately from the last couple of years up it became a optional features for every car here.
Z rated tires are pretty much standard an high-end cars ofcourse ;)

I do find it a pity that the export models don't get the cornering lamps and DRL though...
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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And I've readsomething about an oil-cooler included in the towing-package, what's up with that?
The "towing package" includes HD cooling (V03 for later Sevilles) - one component is an oil cooler: a heat exchanger in the passenger side radiator tank with high pressure lube oil lines snaking arounnd to the fittings on top of the oil filter adapter.

The HD cooling is also a package in the Z-rated cars. Many European (including your Netherlands) cars were delivered with a Z-rating - speed unlimited by a PCM program. Either the RPO sticker, the RPO printout, or the tire spec sticker on the driver's door.
 

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Discussion Starter #15
Does that mean what I think I mean? No (top-) speed limiter? Holy macaroly!

Does this HD oil cooler have any extra use, under normal circumstances? Does this mean the engine should run cooler that ones who don't have such a oil cooler?
 

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A Z-car will go as fast as horsepower, drag, and common sense allows .............. In our cases, "in excess of 149 mph".

The engine oil cooler option was intended primarily for the trailer towing package - but for the Autobahn or Autostrada driver who normally commutes at 110 mph+ it's a (probably unnecessary) safety option.

The term "oil cooler", as applied to these setups, is an oxymoron - the heat exchanger is in the passenger side or 'hot' radiator tank in order to keep the engine oil up at proper operating temperature - about 200 degrees +/-. That cuts engine drag and allows the oil to boil off moisture and acid byproducts for burning through the PCV system. Cold oil costs horsepower and is death on engine guts. Remember that every piece of internal reciprocating/rotating machinery is cooled by oil - not coolant - so an oil cooler is extra insurance at very high speeds, but totally unnecessary in an American 65 mph Interstate slowpoke environment. Our oil filters incorporate an internal media bypass valve: Until the oil warms sufficiently, practically NO oil is filtered through the media - it's all bypassed straight to the galleries.

"Engine run cooler" - NO. The thermostat is set to begin opening at 188 and fully open at 206. The engine, properly maintained and in good condition, will run all day at about 195 - 210 regardless of speed.

I noticed something the other day in my car.......... I had done a couple of runs up to 130+ and initiated a forced engine braking process when I looked up at the ScanGauge as coolant temp dropped from 192 to 182 ! Outside air temp was 33F, Intake Air was 37F. What happened ???? The Northstar shuts down fuel delivery on forced or extended coastdown - the long slowdown from 130 to 20 cooled the engine radically in a hurry. Most interesting. Did it again - same phenomenon. Did a slowdown (after warmup) from 70 in normal coastdown fashion - temp stayed at 12 o'clock (196F for my gauge).
 

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Discussion Starter #17
I see! Thanks for explaining, this clarifies alot for me :)

Little bad news though, the STS I was planning on visiting this sunday (The one in the pictures with the trailer towing pack) is going to be rescheduled for sunday next week... Oh well!

Still going to take a look at this '01 SLS on saturday, looks quite nice doesn't it?

4807092-1-7-3.jpg

4807092-2-7-3.jpg

4807092-6-7-3.jpg

4807092-8-7-3.jpg

Probably needs Oil change... :p
+/-98128 Miles
4807092-12-7-3.jpg


Also this seems to be the right height of the car, right?

4807092-7-7-3.jpg
 

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That side view of ride height is identical to my STS - It sat like that when I test drove it at the Cadillac dealer in 2005 and it sits like that today.

The STS series uses a 300 hp 3.71:1 final drive VIN 9 powertrain = "performance package". Seville Touring Sedan
The SLS series uses a 275 hp 3.11:1 final drive VIN Y powertrain = "economy package". Seville Luxury Sedan

Look at the tire specs sticker on the driver's door - that will give the original tire size as well as the speed limiter set into the PCM. The Sevilles have two limiter settings, maybe three - S = 112 mph; H = 130 mph; Z = unlimited ("in excess of 149 mph").

All these "VIN" references - Vehicle Identification Number -- each character means something - character 8 is the powertrain definition.......
 

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No, will not, they run at the same temperature, and just as a FYI, you would like your engine to run as hot as possible (well up to a limit of course) because it runs more efficient. I am not sure where this coler engine is better thing came up, even all sort of aftermarket products sold advertising they make your engine run cooler and is desirable for some reason.
So a good running engine does not need to run cooler, a engine with issues will tend to overheat, and that's where you want it run cooler (by that cooler than overheated, not cooler than normal).

As for the top speed, legally manufacturers can’t sell cars with a top speed that exceed the rating of ANY component equipping the car. Tire speed rating is the most important component in this equation.
As a result depending on the tire option selected, the car top speed was limited accordingly.
The body/engine power is limited at 156 MPH, theoretically is impossible to go faster than that unless is downhill with a strong tail wind.
So the unlimited cars are the ones equipped with the “Z” rated tires.
Then you have the “H” rated car limited at 130 MPH.
Below we are in the SLS/ESC/DHS territory. But the vast majority of both trim levels are “H” rated.
Probably all "Z" rated cars have the HD cooling, and also a good chunk of the "H" rated (STS/ETC/DTS).

In a pre ’00 car you can swap the PCM with one from a “Z” rated car (requires relearning the start enable password). You can also remove the limiter on all PCM (at a fairly expensive price)
 

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Does GM-Europe keep parts for that old an American car? You may have trouble getting repair work done in a few years.

My DeVille's rear air shocks wouldn't leak with a normal load, but the compressor would occasionally run when fully loaded, which scared me the first few times. If the shocks themselves aren't leaking, you could set the tubing up for manual air inputs, as my Fleetwood was. Then you can ride around with your tail in the air.
 
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