Question about 1997 Cadillac DeVille
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Posted on Jan 02, 2017
SOURCE: 1994 cadillac deville concours
Look if the engine is doing what you say then it is overheating and there is no problem with the sensor, remember the sensor only tells what is going on, it does not cause anything like overheating. Have you bled the system of air, there is a factory procedure to do this.
Posted on Oct 14, 2008
PO135 is oxygen sensor Bank1 sensor1. PO404 is EGR.
personally, I'd pull EGR off, clean pintle good with throttle body cleaner or carb cleaner, re-install, erase codes & try it for a while & see if it code(s) come back.
Posted on May 07, 2009
On the inside trim, you can remove screws that are by the door handle, arm rest, under door and side of door and then gently pull back on the panel as there will also be retaining clips attached and you don't want to break them. You'll need to lift the door panel upwards in order to get it off the window ledge. Then you'll need to manipulate the panel and disconnect the door handle linkage from the door handle and disconnect the wiring for your controls
Posted on Sep 23, 2009
When you say thermagasket kit,I assume you mean one of those silly DIY gasket sealant liquids that you put in the engine.
You should not use these type of products on ANY engine let alone the Northstar.
To cure a headgasket leak, replace the headgasket.....there is no miracle cure.
On the Northstar, you will damage the cooling system,plus you will continue to have issues as time goes on.
How do you know you have a blown head gasket?
Here is something to consider.......
The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,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.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.
Posted on Jun 02, 2010
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