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How do flush the cooling system on a 1998 Cadillac Deville.

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Purchase some radiator flush, make sure cooling system is full follow instructions on container of the flush

Posted on Aug 25, 2010

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Posted on Jan 02, 2017

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OIL IN COOLANT RESERVOIR 00 CADILLAC DEVILLE


Are you sure its oil? If you bought it used someone probably added Bars Leak or some other cooling system sealer which can appear as oil. Cadillac Northstar engines are well known for cooling system problems, and that is usually the first step people take. If it is oil that could indicate an intake manifold leak or a head gasket leak, although it usually results in coolant in the oil, not the other way around.

Feb 15, 2017 | 2000 Cadillac DeVille

1 Answer

Flushing the system in my 2004 Deville


see link below for how to flush 2004 cadillac de ville
How to flush 2004 cadillac deville cooling system



http://www.fixya.com/cars/t12393977-flush_2004_cadillac_deville_cooling

Jul 18, 2015 | Cars & Trucks

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My 98 deville had a cracked radiator. replaced it. all was fine till a couple weeks ago when it overheated due to coolant leak from purge tank. replaced it. no more leaks but still ran up to 140 w/ air on...


First, you must have a properly installed thermostat that is working correctly. Second, Northstar engines are notorious for air in the cooling system after draining and refilling - keep checking the purge tank level after overheating and after the cooling system cools down. Third, make sure your cooling fans are working correctly (relay, fuse, temperature sensor) - check to make sure both are running when it overheats. If all the above is correct, the problem will probably be blockage in the system (try a flush) or your water pump itself is failing.

Aug 18, 2017 | 1998 Cadillac DeVille

2 Answers

Temp got up to 230 on my 99 cadillac deville is that normal


Make sure your engine is breathing properly, by regularly changing air filters. Flush your cooling system once each year and pressure test. There are cooling lines that cross over the rear of the engine that get corroded and may begin to weep antifreeze..you can view these lines by removing the engine cover....if you've had a consistent odor of antifreeze after running,with no drippage evident, this area is probably the culprit.....love my 99...

Mar 14, 2012 | 1999 Cadillac DeVille

1 Answer

Where is the cooling fan sensor located on 1998 cadillac deville 4.6 northstar


The fans /fans are turned on by the pcm, using input from the coolant temp sensor, as well as the HVAC system. The cts is on the right rear of the engine below the egr valve.

Sep 24, 2011 | 1998 Cadillac DeVille

1 Answer

My heater dont work it blow out air but there very lil heat


Check whether the heater core is clogged by feeling the two tubes at the firewall that lead to the heater core. If they are cool rather than hot when the car is at normal operating temperature, the heater core will have to be flushed out, or replaced.

If the two tubes at the firewall are hot, but the interior doesn't get heat, then a blend door problem may exist where it is at the wrong angle due to a faulty vacuum motor, or control for the vacuum motor.

Good luck on getting heat inside of your 1998 Cadillac Deville.

Jan 21, 2011 | 1998 Cadillac DeVille

2 Answers

Having problem starting and engine has no power then goes


Have you checked anything in that car yet? if so telling us would let us be able to help you better.

Jul 12, 2010 | 1997 Cadillac DeVille

2 Answers

Flush radiator and cooling system on 1997 Calillac DeVille Concou


your radiator has a pecock on the bottom of it screw it out then you can run water through a hose behind it once it stops draining to get any residue out as far as the engine youll never truly get all of the old coolant out without tearing it down and putting it back together so flushing the radiator is just fine.

Jun 18, 2010 | 1997 Cadillac DeVille

2 Answers

My engine is running hot in my 97 cadillac deville and its not the thermostat. Any suggestions


Its likely the head gasket has failed. Look for bubbles or oil in the radiator

Jun 12, 2010 | 1998 Cadillac DeVille

1 Answer

AC BLOWER MOTOR GETS HOT THEN TURN OFF.


I HAVE A 1998 CADILLAC DEVILLE,THE AC BLOWER MOTOR GETS HOT AND TURN OFF AND WONT TURN BACK ON UNTIL IT COOL OFF, WHAT IS THIS PROBLEM?

Jul 04, 2009 | 1999 Cadillac DeVille

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