Question about 1998 Cadillac Catera

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Where are the hoses that run to radiator to cooling system located? send diagram. Oil went into water tank on 1998 cadillac catera

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  • Curt Downs May 11, 2010

    Sounds like a head gasket failure, not a radiator hose problem.

  • Richard Scordino May 11, 2010

    Very important to answer this: Is the oil you see reddish in color or brown like from engine? Is there any coolant in your engine oil? While waiting for answer, do not drive it!!

  • charlie Park Jul 14, 2016

    more likely Curt Downs has right answer. When engine warmed little open reserver tank cap( very CAREFUL so much pressure) slightly open and close then you will hear whistle sound and coolant bubbles up that's the indication of head gasket is gone. Good luck!

  • Alonzo L Ramsey Oct 07, 2019

    I don't have a diagram but I'm looking for the hose that controls the noise coming from the manifold.

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I don't have a diagram, but your problem is the oil cooler underneath the intake on top of the engine. Remove the intake, and the cooler is right there in between the heads. Easy to change once you get the intake off. This is a VERY common problem on Cateras, and the symptom of it is oil in your coolant. I have a 1998 Catera and had the same issue.

Posted on Jul 31, 2010

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1 Answer

1998 cadillac catera


It should be on the rear passenger side of the engine.

Jul 23, 2008 | 1998 Cadillac Catera

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1998 cadillac catera oil pressure light come and and the car overheats when sitting in traffic....


CHECK ENGINE OIL LEVEL SHOULD BE ON THE FULL MARK ON ENGINE DIP STICK. IF OIL LEVEL IS LOW.LOOK FOR OIL LEAKS UNDERNEATH CAR.IF ENGINE NOT LEAKING OIL CHECK OIL PRESSURE SHOULD BE 22 PSI @ 900 RPM IF NOT OIL PUMP FAULTY OR YOU HAVE WORN ENGINE BEARINGS.IF OIL PRESSURE OKAY YOU COULD HAVE FAULTY OIL PRESSURE SENDING UNIT. CHECK COOLING FAN TO SEE IF CAR COOLING FANS RUNNING WHILE ENGINE OVERHEATING.IF NO CHECK COOLING FANS RELAY AND FUSE IF ALL IS GOOD ENGINE COOLANT TEMPERATURE SENSOR FAULTY. IF COOLING FANS RUNNING WHILE ENGINE OVERHEATING.HAVE RADIATOR AND ENGINE FLUSHED OUT. REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.

Jun 12, 2011 | Cadillac Catera Cars & Trucks

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I changed the water pump and the thermostat and still have no heat the passengers side front floor does not get wet so i dont beleive that it is the heater core my radiator hoses do not get alot of...


Hello! It is extremely important that you only use Dex-Cool in your Cadillac's cooling system...It is Orange in color...If you have used another coolant or the block has not been flushed in some time, flushing is needed...

Drain the cooling system...Do not remove the thermostat...Fill radiator with drinkable water...Turn heat on full...Run engine until thermostat opens...Shut down, let cool then drain...Do this several times until water comes out clean...Replace thermostat...Replace O-rings on thermostat pipe...Coat thermostat bolts with Permatex...Re-fill with Dex-Cool...

Here is Vacuum Diagram...

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Guru.Saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

Jan 26, 2011 | 1998 Cadillac Catera

1 Answer

I have a 1998 Cadillac Catera. Oil is going into the radiator. Water is not in the oil, only oil in the water. I have flushed it but the oil level continues to go down and the water continues to get...


Hello: The oil cooler is not in the radiator. The oil cooler is under the intake manifold which has to be removed to replace the oil cooler.

Nov 06, 2010 | 1998 Cadillac Catera

1 Answer

Why is water resevoir keeps getting contaminated,oil cap is clean ,car isn't smoking,look's like gunk in it .


oil is getting into the cooling system through the oil cooler. the oil cooler is located under the intake manifold. After replacing oil cooler you need to flush the cooling system several times to remove all of the oil sludge

Aug 23, 2010 | 1998 Cadillac Catera

2 Answers

Where is the thermostate located on a 1998 cadillac catera 3.0 v6 engine


Hi Friend:

To Locate your thermastat, Open your Hood and look down at the top of your radiator.You'll see a Top Raditor Hose that goes from your radiator to your Thermastat Housing.

You'll see a Hose clamp on the Thermastat housing .

NOTE: before you loosen the Hose Clamp Make sure you your car is cooled down and remove your radiator cap to release any pressure that is in your system.

After the Hose is off you'll see a Domed shaped Housing that is your Thermastat Housing. Remove the Bolts that Hold the Housing on and Seals the Cooling System.From Leaking out of the Housing.

After removing the Housing you'll see your Thermastat .Just remove it and Clean up all old gasket Material so you can replace the gasket with your new one .But put in your new thermastat 1st.

Then make sure you seal the gasket with Gasket Glue. And Replace the Housing Bolts and Tighten up good and Sung.

Put back on your hose then clamp.And Refill your Radiator with Coolant.

This will get your new thermastat in and get you Ready to go .

Thanks for using FixYa Please let me Know how my Solution helped you.By Voting .

Thanks Again From: d_hubbs

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3 Answers

98 Cadillac Northstar motor running hot in 30 min.


The normal operating temperature for the Northstar engine is around 210 degrees.
The fans will not come on until the temp hits 225 degrees.

The thermostat in the northstar engine is located at the bottom radiator hose (unlike most conventional cooling systems).

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 to near the thermostat housing,the blockage may be there.

If the other end of your purge line is not connected to anything then that is the problem......it must be reconnected otherwise the cooling system is not pressurized.

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1 Answer

Oil in water


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1 Answer

1999 cadillac catera oil in my water system


Red oil, radiator trans cooler has failed....Brown oil, iether intake or head gasket has failed...do not drive car...have it towed to a shop .

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