Question about 1997 Cadillac DeVille

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Need to find out where overflow hose connects tried following it but it just ends underneath where i put antifreeze in 97 cadilac deville

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There is an over-flow hose between the coolant recovery tank, and the top of the radiator just below the radiator cap, and there is also an over-flow hose from the top of the coolant recovery tank and it just hangs over the side of the recovery tank and runs the over-flow off out under the front of the passenger side fender well area.

Posted on Sep 10, 2010

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Posted on Jan 02, 2017

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Leaking water on 4.6 2000 deville on right side against firewall possible causes


Is it antifreeze or just water? If water, your AC system will frost up under use, which will melt and pool under the car on the passenger side (normal) after the engine stops. If antifreeze, there is a complicated cooling hose system, with some of them near the firewall. Check the overflow tank to see if you are losing coolant, and if so, check the hoses there while the engine is running.

Mar 02, 2017 | 2000 Cadillac DeVille

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How to check for leaks of antifreeze/in 97 expedition smell of antifreeze


Hi Sharlene,so you smell antifreeze.Raise your hood and check your antifreeze over flow container,you should have a l and a h mark on it,high and low.If low,then it's leaking somewhere,look at the radiator cap and overflow hose for leak,look at over flow container for leak from hose going to it from radiator,look all over engine,look at top and bottom radiator hoses and clamps for leaks,if leaking there,tighten clamp with flat head screw driver,if no leak is found,get under vehicle and see if any antifreeze is visible,maybe water pump,look on ground for leak and follow,check floor board on driver side,heater core could be bad,check hoses going to heater core from engine firewall.

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1 Answer

Something is leaking underneath when i put antifreeze in. Is there a hose i need to replace? I cant see aything but the leak because it flows right out


check heater hoses on backside of engine they go through the fire wall to the heatercore they are about 1 inch in diameter and they are black with metal lines going in to them

Jan 22, 2012 | 1997 Cadillac DeVille

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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

My heat is not working in my car. i tried first


There won't be a "valve" to put antifreeze in. There will be a radiator overflow tub. This will be located off the side of the engine compartment, near the front corner. (To locate, follow the overflow hose from the radiator cap to the catch tub.) You can replace radiator fluid in there, or in the radiator itself. That should get you some heat.

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Coolant lightcame on (2004 Cadilac deville. Had


Is it the LOW coolant light? Your car is equipped with a sensor on the expansion tank (radiator overflow). Right front fender. It's there for when the car heats up. As the engine heats up and the coolant expands it racks into the reservoir/overflow/expansion tank. When the engine cools, it sucks the coolant back in. If your car was low on coolant then there's a good possibility that as it cooled, it sucked the recently added fluid in. Check that it is full to the "cold full" level by looking at the tank before you start it for the day. If it's not, then the sensor is telling you to add coolant. If it is, then the sensor in the tank may be bad.

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its under where the top raidiator hose connects to the engine 2 bolts 1 bracket and take the top hose off

Jan 21, 2010 | 1976 Cadillac Deville

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My subaru 97 impreza overheated on the freeway. I


If the water is flowing into the overflow tank then it is probably running a little hot. It is normal for a little bit to flow into if as the water heats and expands but there shouldn't be enough to overflow the tank. Have you tried changing the thermostat? If the thermostat isn't opening properly this will have all the effect in the world on how hot your engine runs.

Nov 16, 2009 | 1997 Subaru Legacy

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Why is water coming out of my radiator in my 97 cadillac deville with a northstar


NOt enough info. Where is the water coming from top or bottom? Could be a leak at a seam, could be a loose cap, could be a leaky overflow bottle, could be a loose hose connection and it could be a crack or leaking hose.

Aug 10, 2009 | 1997 Cadillac DeVille

2 Answers

Car is leaking antifreeze from underneath of car


I would check and replace the thermostat if it is bad, recheck the connections of the heater hoses to the heater core, and if none of these are bad, the heater core is most likely gone bad. Also, depending on where the overflow canister is, and if the radiator cap has gone bad, it might be letting too much antifreeze out of the system and overfilling the overflow canister.

Aug 07, 2008 | 1999 Mitsubishi Eclipse

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