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My 93 cadillac deville is overheating, new radiator, and hoses. Fans are working as well. Plenty of coolant.Replaced a "t" shaped connector that had broken. The old one was narrower on one side than the other but the new one is the same diameter on both ends, could this be my problem?

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Thormastast SOUNDS TO BE STUCK HALF OPEN, . Easy Fix.

Posted on Mar 21, 2011

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IT KEEPS OVERHEATING


REPLACE THE THERMOSTAT AND RADIATOR PRESSURE CAP.IF COOLANT LOW, ADD MORE COOLANT THROUGH COOLANT OVERFLOW UNTIL COOLANT LEVEL IN THE COOLANT OVERFLOW STAY AT FULL COLD MARK.REASON POUR COOLANT THROUGH COOLANT OVERFLOW MOST GM CARS DONT HAVE RADIATOR CAP.WHEN YOU GET COOLANT LEVEL OKAY, CRANK CAR LET IT IDLE UNTIL ENGINE GET HOT BUILD UP PRESSURE THEN TURN OFF CAR.CHECK FOR COOLANTS LEAKS AT THE RADIATOR HOSES,CHECK FOR LEAKS AT THE RADIATOR, CHECK FOR LEAKS AT WATER PUMP WEEP HOLE IF YOU SEE COOLANT LEAKING FROM WEEP HOLE REPLACE WATER PUMP. IF CAR OVERHEATING WHILE IDLING YOUR COOLING FANS NOT WORKING CHECK COOLING FANS FUSE AND RELAYS.IF FUSE AND RELAYS OKAY THE ENGINECOOLANT TEMPERATURE SENSOR BAD.

Aug 01, 2011 | 1994 Cadillac DeVille

3 Answers

My 1999 cadillc deville delegance is overheating. I have replaced the radiator and hoses, pressurecap, thermostat, water pump, check the purge line and nipple on the coolant tank. What else can be causing...


IF COOLANT SYSTEM BEEN BLED AND PLENTY COOLANT IN COOLANT SYSTEM. THE IGNITION TIMING LATE OR VALVE TIMING LATE TIMING CHAIN WORN WITH A LOT OF SLACK JUMPED A TOOTH ON CRANKSHAFT GEAR TEETH OR ENGINE CYLINDER BLOCK WATER JACKETS CLOGGED ENGINE BLOCK NEED FLUSHING. IF ENGINE OVERHEAT WHILE SITTING IDLING LONG TRAFFIC LINE COOLANT FANS NOT TURNING ON.COULD HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR FAULTY COOLANT FANS RELAYS OR BLOWN FUSE.PCM FAULT.CHECK ENGINE OIL IF IT LOOKS LIKE MILK SHAKE YOU HAVE BLOWN HEAD GASKET.

Jun 05, 2011 | 1999 Cadillac DeVille

2 Answers

I have a 1999 Cadilac Deville that I replaced a


Are you sure the thermostat was in the wrong way ?.

The thermostat is located in the bottom hose unlike most conventional cooling systems.

The thermostat in the Northstar engine is a dual action device.
One end of the stem is the Thermostat(obviously) and at the other end is a spring loaded pressure valve(the thinner end).

Make sure the thermostat end is nearest the rubber hose and the pressure valve end is in towards the engine.

Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.

For overheating problems consider the following......

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.

Jun 30, 2010 | 1999 Cadillac DeVille

1 Answer

Cannot find overheating problem 1997 cadillac deville. we have installed new radiator, fans work fine, new water pump, new thermostat, catalyic converter, new hoses, and we cannot find any leaks. please...


These engines are know for leaking head gaskets. A good quick test for this is fill the coolant tank to the top with the cap off. Start the engine. If the the coolant blows out of the tank, you have a head gasket leak.

May 31, 2010 | 1997 Cadillac DeVille

2 Answers

Why does my cadillac 1998 deville keep overheating?


Overheating can be numerous things: Fans not working, water pump, thermostat, overflow cap, and the list keeps going. When the engine is running and heats ups, feel the heat of the top hose, if the hose isn't hot, the thermostat is most likely stuck open and needs replaced. If it is hot we know you have circulation. The cap on the expansion tank may be defective, if it can't hold the pressure of the water, it will release at the overflow cap if the cap is bad. Also check the coolant level.

Jan 30, 2010 | 1997 Cadillac DeVille

2 Answers

In our 1995 Cadillac Deville we can't get the fans to come on to cool the radiator. There are four relay switches and we don't know if we have to replace all of them or is there just one and where is the...


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.

Oct 28, 2009 | 1995 Cadillac DeVille

2 Answers

I have changed the thermostat and radiator but the car continues to run hot. 96 cadillac deville


Make sure that the A/C condenser in front of the radiator is unobstructed and that the fans are operating correctly.
I'm assuming that you have had the car tested for hydrocarbons in the radiator and that there is no steam coming from the tailpipe and you have no leaks? (head gaskets)

Oct 07, 2009 | 1996 Cadillac DeVille

4 Answers

1996 Cadillac Deville- running hot


is the water pump, belt and tensioner OK? its not where you think it is. its on the drivers side of the front cylinder head.

Oct 03, 2009 | 1996 Cadillac DeVille

1 Answer

My 1998 deville is overheating, I have had the h20 pump replaced last summer, could it be the thermostat or the headgasket? there is no leakage that I see.


I assume motor tune or other mechanical condition is not causing the problem.
Yes, the thermostat is a common cause of overheating - replace the thermostat.
Also:-
Check operation of the radiator cooling fans is ok.
Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary,
Ensure radiator hose on suction side of waterpump is not collapsing at engine revs above idle (due softening),
Check radiator cooling core is not blocked internally or externally.
If the motor has been severely overheated, the head gasket could be blown - look for combustion gas bubbles in the coolant resevoir.

Aug 27, 2009 | 1998 Cadillac DeVille

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