20 Most Recent 1998 Cadillac Seville - Page 8 Questions & Answers

Dude KravCar i seriously want to thank you for helping me fix my car!!@! i have a 1995 Oldsmobile Aurora Northstar 4.0 V8 and i came across your response to someone who was having an overheating problem with their Northstar Engine.....you commented for them to remove and inspect one of the purge lines to bleed out the air........ now after countless hours in my garage and wrongful diagnosis from a repair shop i finnaly have my engine running back fine after reading your response......thanx dude

TEST the Following BATTERY ALTERNATER and STARTER.

Yes, Massive air flow from the first fan is causing air to be brought in from not only the front of the radiator but from the fan right next to it causing reverse air flow through the fan. This intern can cause less dirrect airflow through the radiator. Also, the recirculation of hot air (from the first fan) into the second fan, across the radiator and back to the first fan can cause the vehicle to run hotter. Wile the car is moving there is enough air pressure from the outside of the vehicle to flow directly through the radiator with little fan assistance needed. If you have the engine running and and turn on the a/c, you should hear the fan change speed or even see the second one turn on (If the fan is working), there is no delay. You might have a bad relay and good fan, as there is a separate relay that activates this same fan for the a/c.

Underhood fuse block

You have no choice but to take it to a dealer.
They will reprogram the code in the radio to match with the code in the anti-theft module.

A relay follows the breaker then wired to the window switches

The stop lamp fuse is in the rear junction block located under the back seat.
To remove the back seat,simply grab the front of the seat with both hands underneath and pull straight upwards, this releases the spring clips, no bolts or screws to remove.

Diagram of rear junction block:-



The stop lamp fuse is numbered 19 in the diagram above.

Same that happened to me. There is a detailed write-up here: http://vatspasskey.com . The guy is great, this was the only way I was able to save my Park Avenue. I see it applies to your model too.

There is a detailed write-up here: http://vatspasskey.com . I saved my Park Avenue with this and I see it should work with your model too.

replace the the blower motor resistor located next to the blower motor. this controls the blower speeds

get a new coolant bottle or you will have massive coolant loss and do alot of damage to the engine

Hi,

Kindly tell me the Make, Model and Year of the Car. You might need to Inspect Certain Components and the Location would be Different for Different Models.

Let me know,so that we could proceed.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

have the altenator checked out

The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
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.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 to near the thermostat housing,the blockage may be there.

You do not need to get your stereo codes, the code is already "hardwired" in.
To reset everything, just disconnect the battery for 30 minutes.

The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
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.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 to near the thermostat housing,the blockage may be there.

Sounds like the motor that opens the door in the duct work to let the heat in isn't working right or the door is jammed.

I presume you are referring to the gauge, That being said, it sounds to me like you have a air pocket in the cooling system. Check your coolant level (after it has cooled down), and run it for a few minutes with the cap off to burp the system if it was low.