Question about 1998 Cadillac Seville

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I need a cadillac seville sts 1998 4.3L & 32

I need a cadillac seville sts 1998, 4.3L & 32 valves; cooling system diagram, and all diagrams I can get to try to repair my car.
something is wrong . . . the system is overheating !
perhaps is leaking?
I try changing fuses and I don't know what to do

thanks

ROBLES

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  • Mark Carrington
    Mark Carrington May 11, 2010

    Can you go into a bit more detail please......how do you know the engine is overheating?.......explain what happens and what you see....warning lights etc.......does this happen on the highway or stop and go traffic etc etc....

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Try Item #1 first it is the easiest.
Then Check the small water pump belt, it is not the serpentine belt.
The next step is to either check the Block with the following block tester available from NAPA
The part number is 700-1006
or change the thermostat dealer cost about 60.00 AUTOZONE about 40.00 You will need to purchase the Gasket with which ever you purchase from.

I had written a detailed note and the system dropped it. I hope this helps. coolant system drawing is available from:
http://media.photobucket.com/image/coolant%20system%20cadillac%20sts%201998/Parallax1/NSCoolingSystemCircuit.jpg

Posted on Oct 05, 2009

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Check for coolant flow at the Purge line,this is a common problem on the Northstar.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.

Posted on Oct 04, 2009

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I believe you have a 4.6L engine. These vehicles have known overheating issues. Chances are you have a engine mechanical problem. If you do not have any coolant leaks and the thermostat is working ok, you really need to take it to someone who has worked on that engine before.

Posted on Oct 01, 2009

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Cadillac sts wire diagram


1994 Cadillac Seville Car Audio Wiring Color Codes
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Gray/Black
Car Stereo Antenna Trigger Wire: Pink
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 5 1/4′
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: 6′ x 9′
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Brown
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Vacuum Leak, the car jurks sometimes while riding.


When the problem is a vacuum leak you also have troubles at idle.
The vacuum can be tested using an hand tool gauge like this.
Vacuum/Fuel Pump Tester Kit
Once you find the leak, replace the leaking part.
Often it is easy to find the leak at a glance, as it is hissing or you notice the air out from the leak. Other techniques are pumping smoke inside vacuum or spreading soapy water on vacuum lines.
check also the EGR valve.
If you need the vacuum system diagram purchase a repair manual like this one : 2000 Cadillac SeVille STS Repair Manual on CDROM .
Here also a free tutorial on vacuum problems.
Regards.

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It does cost a few bucks. Not to bad though.

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