Top 10 1997 Cadillac Seville Questions & Answers

It may appear if there is a particular sensor fails.
Try stopping the indication using the following technique.
Sometimes the problem could be solved.

If you can get an OBD 2 scanner off eBay (US$ 6), you could be able to communicate with your car ECU (Electronic Control Unit) using the smart-phone app.

So that, there is a chance to CLEAR all the error indications.

After that, if problem still persists, it means the vehicle need full scan (you can't do this at home, probably seek a vehicle garage).

Clarification:
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it seems like the radiator of your car needs attention. check for coolant level in it, when its cold. if les add some coolant and then see if the problem persists.
--than there are chances of chocking in the coolant pipes, may be they not reached to engine..  
--Check the chock,, that it is not turned on. 
--May be sum loosing nut in engine.

You should not have to jump compressor to recharge a/c system, when adding freon low pressure switch will kick compr on, if it's not kicking on or it read low freon on your dash, replace both low pressure switch's, both sit along fire wall from left to right on a thin a/c line, when replacing these switch's make sure what ever freon in system is recover.

it sounds like the problem started with the brake shift iterlock switch by forcing it he now broke the trans shift cable mech at the column

all general motors vehivles from 97-2005 contain an anti-theft system, called a passlock system. try this it will work on a malibu theft system. turn key on engine off for about 10 minutes,after 10 minutes turn key off. wait 15 seconds then try to start car. if it is the passlock system this will reset it.

The belt is broken its a big one

First I would obtain a listing of the Diagnostic Service Trouble Codes which might point you to what the malfunctioning problem might be. Usually, if their is a problem your Service Engine Light may be on.

I would also say to check the fuses for the fuel pump but if a fuse was broken or shorted the pump should not be working at all.

Before you replace a fuel pump, I would check out replacing the Fuel Filter and then the Fuel Presure Regulator. ( FPR ) Note: Their are 2 different types of ( FPR ) one for engines with Nylon Fuel Rails and one for engines with Stainless Steel Fuel Rails.

Another possibility is that your EGR Valve is malfuntioning or possibly the vacum to it has become disconnected or has a crack in its connecting hose. I am not going to detail the EGR more than this because it's the least likely cause except for checking its vacum hose connection which is easily checked and replaced.

Because of the backfiring or misfiring I would consider the possibility that one or more of your ignition coils might be going bad or has gone bad. It can also be caused by old spark plug wiring or even their connections to the ignition coils and the plugs.

IGNITION COIL PACK MODULES ( ICPM )

On a 1997 Cadillac Seville SLS if your running the Northstar engine it has( 4 ) Ignition Coil Pack Modules ( ICPM ) located just before the firewall on the passenger side. They can be replaced individually but since you can get them for anywhere between ($14 to $39 ) each I suggest you replace them all at one time.

Make sure and replace the ( ICPM ) in the proper sequence and that you get the spark plug wires reattached according to proper cylinder firing order. Older Igniton Coil Pack Modules had numbering for each cylinder on them, the replacement ones do not. Their is a correct sequence and I suggest either obtaining that or taking good notes and labeling the spark plug wires so that you get the correct ones put on in the proper order. You can also mark the ( ICPM ) with the correct numbers if that helps using a white ink marking pen.

The (Four ICPM) mount to an Igntion Control Module Circuit Board which has other wires and a grounding power cable connected to it. Just be careful that you don't damage any of the the connection wires that are on either end of the module.
I am not speaking of spark plug ignition wires, but other modular connecting wires that go to the Computer Control Module, etc.

Their is a good instruction guide located here:
http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0900c1528025eb00

OXYGEN SENSORS

Your car can also backfire if your Oxygen Sensors are defective. The 1997 Cadillac Seville has (4) Oxygen Sensors.
Oxygen Sensors work in pairs so you have to replace both units which complete a working pair match at one time.
Two of these can be self replaced with a little difficulty using a special tool ($10-$15 ). They are easier to replace if the car is jacked up a bit. Again the Diagnostic Service Trouble Codes can tell you if these are malfunctioning and which ones. . The two rear most Oxygen Sensors can be self replaced as mentioned above. The Oxygen Sensors located closer to the Manifold are more difficult to replace and usually need to be done at a shop because of their location.

(Use caution whenever working with a Jack or under a car supported by a Jack).

Replacing Igniton Coil Packs, Spark Plugs, Fuel Filters, the Fuel Pressure Regulator and the Igniton Spark Plug Wires are considered part of a Tuneup Package and can all be done by yourself if your auto mechanically inclined and have a basic automotive tool set ($15 to $35).

If your replacing the plugs and wires make sure to get some lubricant to put on the wires and plugs before replacing and reattaching them. The lube is sold in small packages at most automotive store counters and costs about $1.50 a package.
You will need a couple of packages for each.

I recommend you also pick up some hand cleaner and shop rags while your their as well ( I prefer the GOJO or GOUP cleaners in the can which also have skin conditioners in them as well.) Cost about $10.

serpentine belt diagram

Here you go

the diagram should be affixed to the top of the stereo