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2003 STS F55
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34 Posts
Discussion Starter #1
Hello, I was looking to change the entire suspension of my Cadillac Seville STS 2003 and I was looking at Rockauto because I am from Spain and I don't know very well which one I need, they have nowhere to ask to tell me which one would be worth 100% If someone could help me find it, I'd appreciate it. The suspension is hydraulic and electronic and I also need a new 60mm radiator.

Regards and thanks.
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
Joined
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68,423 Posts
Our cars use the GM/DELPHI/Lord Magnetic Ride Control active suspension system. Very sophisticated and, when correctly maintained, excellent suspension control under all conditions from 0 to mph top speed limiter and under all road conditions. You lose many, many features when converting to standard passive struts and shocks. But sometimes practical due to parts costs.

Monroe passive struts and shocks are the best option. You should retain the rear Electronic Level Control system which compensates for extra weight in the trunk or rear seat. It uses air bladders on the rear shocks, height sensors, airlines, and a compressor/control head to supply or vent air to/from the rear shock bladders. The correct Monroe replacement shocks retain this feature.

To trick the many, many suspension controls into thinking there's still an active suspension system installed you must insert a 5 watt 2 Ohm power resistor across each strut and shock electrical connector (2-wire). Otherwise you get warning messages, speed limited to 90 mph, and many trouble codes. Insulate and waterproof well.

CF member basscatt is a specialist on the correct Monroe parts. Lots of work.

Why do you want to disable 1/2 of what makes the car an STS ?
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
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19,254 Posts
Hello, I was looking to change the entire suspension of my Cadillac Seville STS 2003 and I was looking at Rockauto because I am from Spain and I don't know very well which one I need, they have nowhere to ask to tell me which one would be worth 100% If someone could help me find it, I'd appreciate it. The suspension is hydraulic and electronic and I also need a new 60mm radiator.

Regards and thanks.
==========================
your car has the FE3 - stiff springs and large diameter sway bars - both front and rear -
you do NOT want to change any of those parts - unless they are broken or worn out -

your car also has the F55 - MagnaRide - electronic - front struts and rear shocks -

it is always recommended to retain the F55 components to keep the STS handling features -
HOWEVER - some STS owners choose to replace the very expense STS components
with SLS type - NON-electronic - struts and shocks -

your ORIGINAL - F55 parts are:
STRUTS -
ACDELCO 580462 - both left and right are the same part -

SHOCKS -
LEFT - ACDELCO 5801047 -
RIGHT - ACDELCO 5801048 -
YES - the left and right sides ARE different due to the location of the plug and solenoid -

========================

to convert to the NON-electronic components -

STRUTS - you have a couple choices -

MONROE 171684 - QUICK STRUT - this is the complete - fully assembled - strut assembly -
this has all brand new components - including mount/bearing/SPRING -
NOTE - the springs used in the QUICK STRUT are softer - equal to the FE1 springs used in the SLS model -

MONROE 71684 -
this is the bare strut - you must disassemble the original strut assembly -
and re-use ALL of the original components -

REAR SHOCKS -
MONROE MA822 - these come as a PAIR - 2 shocks in one box -
they retain the use of air bladders to maintain the ELC - Electronic Level Control system -
used on BOTH the STS and SLS models -

you will also need to install a set of resistors to trick the suspension computer into believing the original units are still there and working properly -

==============================

for the radiator - there are TWO possibilities -
DEPENDING on whether your car has the EOC - Engine Oil Cooler - or not -

look at the radiator -
on the DRIVER SIDE -
you will see TWO metal lines attached to the plastic tank of the radiator -
these are the cooling lines for the AUTOMATIC TRANSMISSION -
ALL cars with an automatic transmission have these lines -

NEXT - look at the PASSENGER SIDE -
SOME also have TWO metal lines attached to the plastic tank of the radiator -
these are the EOC - Engine Oil Cooling - lines -
MOST cars do NOT have an EOC -

if you do NOT have the EOC -
I recommend the SPECTRA PREMIUM CU2513 -

if you DO have the EOC -
I recommend the SPECTRA PREMIUM CU2514 -

YES - you CAN order and use a radiator WITH the EOC - even if you do NOT have the EOC -
simply leave the caps on the fittings - although there is no benefit to doing this -

===================

I hope this gives you the information you are looking for -
 

·
2003 STS F55
Joined
·
34 Posts
Discussion Starter #4
Our cars use the GM/DELPHI/Lord Magnetic Ride Control active suspension system. Very sophisticated and, when correctly maintained, excellent suspension control under all conditions from 0 to mph top speed limiter and under all road conditions. You lose many, many features when converting to standard passive struts and shocks. But sometimes practical due to parts costs.

Monroe passive struts and shocks are the best option. You should retain the rear Electronic Level Control system which compensates for extra weight in the trunk or rear seat. It uses air bladders on the rear shocks, height sensors, airlines, and a compressor/control head to supply or vent air to/from the rear shock bladders. The correct Monroe replacement shocks retain this feature.

To trick the many, many suspension controls into thinking there's still an active suspension system installed you must insert a 5 watt 2 Ohm power resistor across each strut and shock electrical connector (2-wire). Otherwise you get warning messages, speed limited to 90 mph, and many trouble codes. Insulate and waterproof well.

CF member basscatt is a specialist on the correct Monroe parts. Lots of work.

Why do you want to disable 1/2 of what makes the car an STS ?
Thank you for the quick response, I do not want to lose those characteristics, I just want to know that cushioning is 100% compatible with the car since I have to order it online, where I live there is not much of Cadillac.
 

·
2003 STS F55
Joined
·
34 Posts
Discussion Starter #5
for the radiator - there are TWO possibilities -
DEPENDING on whether your car has the EOC - Engine Oil Cooler - or not -

look at the radiator -
on the DRIVER SIDE -
you will see TWO metal lines attached to the plastic tank of the radiator -
these are the cooling lines for the AUTOMATIC TRANSMISSION -
ALL cars with an automatic transmission have these lines -

NEXT - look at the PASSENGER SIDE -
SOME also have TWO metal lines attached to the plastic tank of the radiator -
these are the EOC - Engine Oil Cooling - lines -
MOST cars do NOT have an EOC -

if you do NOT have the EOC -
I recommend the SPECTRA PREMIUM CU2513 -

if you DO have the EOC -
I recommend the SPECTRA PREMIUM CU2514 -

YES - you CAN order and use a radiator WITH the EOC - even if you do NOT have the EOC -
simply leave the caps on the fittings - although there is no benefit to doing this -

===================

I hope this gives you the information you are looking for -
thanks man, incredible information, you are the best.
 

·
2003 STS F55
Joined
·
34 Posts
Discussion Starter #6
==========================
your car has the FE3 - stiff springs and large diameter sway bars - both front and rear -
you do NOT want to change any of those parts - unless they are broken or worn out -

your car also has the F55 - MagnaRide - electronic - front struts and rear shocks -

it is always recommended to retain the F55 components to keep the STS handling features -
HOWEVER - some STS owners choose to replace the very expense STS components
with SLS type - NON-electronic - struts and shocks -

your ORIGINAL - F55 parts are:
STRUTS -
ACDELCO 580462 - both left and right are the same part -

SHOCKS -
LEFT - ACDELCO 5801047 -
RIGHT - ACDELCO 5801048 -
YES - the left and right sides ARE different due to the location of the plug and solenoid -

========================

to convert to the NON-electronic components -

STRUTS - you have a couple choices -

MONROE 171684 - QUICK STRUT - this is the complete - fully assembled - strut assembly -
this has all brand new components - including mount/bearing/SPRING -
NOTE - the springs used in the QUICK STRUT are softer - equal to the FE1 springs used in the SLS model -

MONROE 71684 -
this is the bare strut - you must disassemble the original strut assembly -
and re-use ALL of the original components -

REAR SHOCKS -
MONROE MA822 - these come as a PAIR - 2 shocks in one box -
they retain the use of air bladders to maintain the ELC - Electronic Level Control system -
used on BOTH the STS and SLS models -

you will also need to install a set of resistors to trick the suspension computer into believing the original units are still there and working properly -

==============================

for the radiator - there are TWO possibilities -
DEPENDING on whether your car has the EOC - Engine Oil Cooler - or not -

look at the radiator -
on the DRIVER SIDE -
you will see TWO metal lines attached to the plastic tank of the radiator -
these are the cooling lines for the AUTOMATIC TRANSMISSION -
ALL cars with an automatic transmission have these lines -

NEXT - look at the PASSENGER SIDE -
SOME also have TWO metal lines attached to the plastic tank of the radiator -
these are the EOC - Engine Oil Cooling - lines -
MOST cars do NOT have an EOC -

if you do NOT have the EOC -
I recommend the SPECTRA PREMIUM CU2513 -

if you DO have the EOC -
I recommend the SPECTRA PREMIUM CU2514 -

YES - you CAN order and use a radiator WITH the EOC - even if you do NOT have the EOC -
simply leave the caps on the fittings - although there is no benefit to doing this -

===================

I hope this gives you the information you are looking for -


would this be the original then? but I do not see the electronic connector, but according to them it is the 100% replacement and has the same number that you have given me.
 

·
Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
Joined
·
68,423 Posts
The electrical connector for the MRC struts snaps into the side of the very bottom of the strut. The connector for the shocks is a pin that inserts into the top of the shock piston rod - in the trunk, under the carpet on the fenderwell hump.

Click your "more information....." link and zoom in on the bottom of the strut - you'll see the flat connector recess.
 

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2003 STS F55
Joined
·
34 Posts
Discussion Starter #8
The electrical connector for the MRC struts snaps into the side of the very bottom of the strut. The connector for the shocks is a pin that inserts into the top of the shock piston rod - in the trunk, under the carpet on the fenderwell hump.

Click your "more information....." link and zoom in on the bottom of the strut - you'll see the flat connector recess.
So you do not need to buy the entire shock with the connector, the ACDELCO 580462 that comes without the connector would be worth it and the other connector would be inserted and it would already be?
 

·
Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
Joined
·
68,423 Posts
Your home electrical mains - the wall receptacle is the strut electrical connector. The coffee pot wiring and plug is the car suspension system wiring.

The suspension control wiring plugs into the connector at the bottom of the strut or the top of the shock piston rod.

Front struts, rear shocks.

In the schematic the struts and shocks are referred to as LF/RF/LR/RR "damper" - the lower part of the diagram. A and B are the wires/connector that plugs into each strut/shock.

F55 electrical schematic.gif
 

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2003 STS F55
Joined
·
34 Posts
Discussion Starter #10
The suspension control wiring plugs into the connector at the bottom of the strut or the top of the shock piston rod.

Front struts, rear shocks.

In the schematic the struts and shocks are referred to as LF/RF/LR/RR "damper" - the lower part of the diagram. A and B are the wires/connector that plugs into each strut/shock.

View attachment 578850
Then buying only the shock absorber without the connector and cable could you put it on the other shock absorber and it would be worth it? because the one that rockauto ACDELCO 580462, comes without connector only the shock absorber and it would be worth putting the previous connector?
 

·
Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
Joined
·
68,423 Posts
Yes, you use the existing body wiring and connectors/plugs/sockets. Should be a direct swap.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
·
19,254 Posts
the part numbers I listed in post #3 are the correct - F55 - MagnaRide - struts and shocks -
STRUTS -
ACDELCO 580462 - both left and right are the same part -

SHOCKS -
LEFT - ACDELCO 5801047 -

RIGHT - ACDELCO 5801048 -

all the electronics are built into the struts and shocks -
all you have to do is unplug the existing wire from the old strut/shock -
and plug the wire into the new strut/shock -
 

·
2003 STS F55
Joined
·
34 Posts
Discussion Starter #15
the part numbers I listed in post #3 are the correct - F55 - MagnaRide - struts and shocks -
STRUTS -
ACDELCO 580462 - both left and right are the same part -

SHOCKS -
LEFT - ACDELCO 5801047 -

RIGHT - ACDELCO 5801048 -

all the electronics are built into the struts and shocks -
all you have to do is unplug the existing wire from the old strut/shock -
and plug the wire into the new strut/shock -
thanks man.
 

·
2003 STS F55
Joined
·
34 Posts
Discussion Starter #16
Your home electrical mains - the wall receptacle is the strut electrical connector. The coffee pot wiring and plug is the car suspension system wiring.

The suspension control wiring plugs into the connector at the bottom of the strut or the top of the shock piston rod.

Front struts, rear shocks.

In the schematic the struts and shocks are referred to as LF/RF/LR/RR "damper" - the lower part of the diagram. A and B are the wires/connector that plugs into each strut/shock.

View attachment 578850
Hi, I wanted to change the radiator too, do you know what it should be? on the Rockauto page to ask for everything together.

thanks.
 

·
Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
·
19,254 Posts
Hi, I wanted to change the radiator too, do you know what it should be? on the Rockauto page to ask for everything together.

thanks.
===========================
WHAT? -
I posted about the two possible radiator choices -
and included part numbers for the best choices -
you don't believe me?
 

·
2003 STS F55
Joined
·
34 Posts
Discussion Starter #18
===========================
WHAT? -
I posted about the two possible radiator choices -
and included part numbers for the best choices -
you don't believe me?
is that in Rockauto 2 models appear with oil cooler and without it, so I don't know what it is, I would go for AcDelco which are the parts that GM uses as a spare.
 

·
Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
Joined
·
68,423 Posts
Under the spare tire cover there is a sticker with many codes. Those are RPO - Regular Production Option - codes; what's built into THAT car. Google "2003 cadillac seville rpo codes" for links to code definitions.

Some Export Sevilles had heavy duty cooling installed -

If one of your RPO codes is V03 then the car has heavy duty cooling and you need the radiator with engine oil cooler in the passenger side end tank. If there is no V03 code then you want a radiator with the transmission fluid cooler in the driver's side end tank only.

You can use a radiator with both coolers, you just don't hook up the engine oil cooler - no fear of coolant leaks - the unused engine oil cooler ports can remain open or with the plastic plugs installed.

Here is what your radiator area oil lines will look like if the car has the V03 heavy duty cooling. The second drawing is oil cooler fittings on the filter adapter if installed.

oil cooler lines.png
Oil cooler lines at adapter.gif
 
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