Question about 1994 Cadillac Seville

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Coolant Is it true you cannot use green antifreeze in a 4.6 northstar coolant system because it ruins the head gaskets?

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If your engine coolant is an orange or yellow color then yes you should stay away from the green antifreeze it will ruin gaskets and void any warrenty you have left. What year is your vehicle?

Posted on Dec 12, 2008

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Air in radiator


the 4,0l and the 4.6 northstar have the same problem with head gaskets,the head bolts strip or stretch in the aluminum block causing little compress of the head gaskets,the combustion pressure pushes past and enters the coolant.this air in the coolant builds up and pushes the antifreeze out causing an overheat situation.recommend head studs not head bolts..again gm missed the boat or did it on purpose to generate work for the dealerships...

Jan 23, 2013 | 1995 Oldsmobile Aurora

2 Answers

I have a 1997 Cadillac Deville. I just had the radiator and the water pump replaced. Afterward my service engine light comes on and blinks occasionally during the first minute of cold startup. This...


Sounds like a head gasket leak. I have a 1997 Cadillac Deville Limo with the Northstar 4.6L engine. I had a misfire on cylinder 1 that seemed to go away after I added Bar's Leaks Head Gasket Repair for about $30 at Advance Auto and the leak went away. Be sure to get the Head Gasket repair that can be added to regular antifreeze without draining it out and having to add to pure water.

http://www.barsproducts.com/1111.htm

Also, check the code for the associated problem If there is a particular cylinder missing, it might be being caused by the antifreeze leaking into the cylinder on that cylinder that is missing.

Good luck on this Northstar Engine Repair.

Apr 21, 2011 | 1997 Cadillac DeVille

1 Answer

Looking for Kravcar to answer this:\r\n1996 cadillac deville northstar. It overheats very quickly and antifreeze leaks out of the overflow tube. Had a flush & fill and replaced thermostat. A garage did...


ity sounds like the electric fan is not turning on, if it is only overheating at idle (sitting still) and is not overheating when driving, but any good shop should have already determined this. open the hood while idling, and watch to see if the fan by the radiator turns on when idling, and the temp is going up. if the fan is indeed working, then it may be the head gasket, or it may be a slow-to-open thermostat.

if it is the head gasket, you should notice one of the following symptoms: smoke out the tailpipe- usually white, green or red (depending on your type) coolant dripping from the tailpipe at start-up, murky or bubbly oil from coolant leaking into the oil, or an oily film on top of the coolant from oil leaking into the coolant. a clear water drip from the tailpipe is normal, form condensation, but if the drip is the color of your coolant, then you definitely have a head gasket issue.

Mar 27, 2011 | 1996 Cadillac DeVille

1 Answer

What is a blown head gasket and how can I fix it?


Your head gasket is a gasket ( usually 3 layers of metal and synthetic material) that is betwen the head and the block.
It keeps different systems in your engine seperated.

When it "blows" it's mean that it is ruptured and allowing one system to interfer with another i.e: Coolant system with oil ot oil with combustion or coolant with combustion.
Most common is coolant with combustion is which you coolant (antifreeze) leaks into a cylinder and burns with the gasoline when the engine is runng.
This is commonly seen as a thick oily white smoke coming out the exhaust with a definate smell

Replacing a head gasket is not a job for an inexperianced person. It involves removing the upper portion of the engine, eplacing the gasket and reassembling it.

Jan 31, 2011 | 1993 Honda Civic 4 Door

1 Answer

LEAKING ANTIFREEZE TOWARD BACK OFMOTOR ISUZU RODEO 2001 4 CYLINDER


First check the two 3/4" hoses going into the firewall. if those are clean, it will be a blown head gasket. Are you getting a lot of white smoke and sweet-smelling exhaust? If so, you're leaking antifreeze into the cylinders too. Also check your oil for frothyness or greyish oil (using dipstick) - if that's true, antifreeze is in your oil. All of which are conditions of a blown head gasket - it just depends where the gasket failed.

IF it's only leaking on the outside of the engine, you can try a stop-leak coolant additive. These only work if you're only leaking on the outside - will not work if leaking in the oil or in the cylinders. And then they only work some of the time - I have had it work with perfect success in the one time I used it (was a copper color liquid). Sometimes that's better than putting in the money to replace the gasket...

Jan 23, 2011 | 2001 Isuzu Rodeo

2 Answers

Can you use dex-cool in a 2006 scion xb


dex- cool is the orange coolant, you can use this only if it already has dex -cool, dont mix it with the green type coolant, if it has green coolant you will need to drain it before using dex-cool

Jan 14, 2011 | 2006 Scion xB

2 Answers

Hi my gmc envoy 05 i check the radaitor i see that have an oil.so what is the problem we have a leak?


There has been a problem with the Dex cool orange antifreeze deteriorating the upper and lower intake manifold gaskets, causing coolant to leak in to engine.If there is antifreeze in your oil, it will ruin your engine. If you find antifreeze in the oil it will cause the oil to become thick and frothy and will not lubricate the bearings and other moving parts, causing an engine failure. If there is evidence of coolant in the oil, do not drive the vehicle. Have it towed to a repair shop and have the gaskets replaced, oil and filter changed, cooling system flushed and refilled with GREEN antifreeze that is compatible with aluminum radiators and engine parts.

Dec 29, 2010 | 2000 GMC Envoy

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Loosing coolant,but there is nothing leaking.i am adding coolant every day


it is getting sucked into the engine through a crack or bad gasket.
needs attention ASAP. take a sniff at the tailpipe for antifreeze odor, or look for foam on the bottom of the oil fill cap. ain't good.

Nov 01, 2010 | 2002 Pontiac Sunfire

2 Answers

I just purchased a 1999 Cadillac Deville. Drove fine for a few days. Today I drove 75 MPH for 20 miles on freeway and car began to overheat. Dashboard told me to replace oil. Checked the coolant, it took 1...


When a Cadillac (Northstar) overheats, It will give the message to change the oil. If you run a Northstar and keep running it long enough it will start shutting off cylinders and stop the A/C compressor to help protect itself. In this condition I would check for a blown headgasket. Possibly your technican will find the problem. Could also be stuck thermostat, dirty radiator Thanks

Aug 31, 2010 | 1999 Cadillac DeVille

1 Answer

Loosing antifreeze


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WHERE COOLANT LEAKS OCCUR
Coolant leaks can occur anywhere in the cooling system. Nine out of ten times, coolant leaks are easy to find because the coolant can be seen dripping, spraying, seeping or bubbling from the leaky component. Open the hood and visually inspect the engine and cooling system for any sign of liquid leaking from the engine, radiator or hoses. The color of the coolant may be green, orange or yellow depending on the type of antifreeze in the system. The most common places where coolant may be leaking are:
Water pump -- A bad shaft seal will allow coolant to dribble out of the vent hole just under the water pump pulley shaft. If the water pump is a two-piece unit with a backing plate, the gasket between the housing and back cover may be leaking. The gasket or o-ring that seals the pump to the engine front cover on cover-mounted water pumps can also leak coolant. Look for stains, discoloration or liquid coolant on the outside of the water pump or engine.

Radiator -- Radiators can develop leaks around upper or loser hose connections as a result of vibration. The seams where the core is mated to the end tanks is another place where leaks frequently develop, especially on aluminum radiators with plastic end tanks. On copper/brass radiators, leaks typically occur where the cooling tubes in the core are connected or soldered to the core headers. The core itself is also vulnerable to stone damage. Internal corrosion caused by old coolant that has never been changed can also eat through the metal in the radiator, causing it to leak.

Most cooling systems today are designed to operate at 8 to 14 psi. If the radiator can't hold pressure, your engine will overheat and lose coolant.

Hoses -- Cracks, pinholes or splits in a radiator hose or heater hose will leak coolant. A hose leak will usually send a stream of hot coolant spraying out of the hose. A corroded hose connection or a loose or damaged hose clamp may also allow coolant to leak from the end of a hose. Sometimes the leak may only occur once the hose gets hot and the pinhole or crack opens up.

Freeze plugs -- These are the casting plugs or expansion plugs in the sides of the engine block and/or cylinder head. The flat steel plugs corroded from the inside out, and may develop leaks that are hard to see because of the plug's location behind the exhaust manifold, engine mount or other engine accessories. On V6 and V8 blocks, the plugs are most easily inspected from underneath the vehicle.

Heater Core -- The heater core is located inside the heating ventilation and air conditioning (HVAC) unit under the dash. It is out of sight so you cannot see a leak directly. But if the heater core is leaking (or a hose connection to the heater core is leaking), coolant will be seeping out of the bottom of the HVAC unit and dripping on the floor inside the passenger compartment. Look for stains or wet spots on the bottom of the plastic HVAC case, or on the passenger side floor.

Intake Manifold gasket -- The gasket that seals the intake manifold to the cylinder heads may leak and allow coolant to enter the intake port, crankcase or dribble down the outside of the engine. Some engines such as General Motors 3.1L and 3.4L V6 engines as well as 4.3L, 5.0L and 5.7L V8s are notorious for leaky intake manifold gaskets. The intake manifold gaskets on these engines are plastic and often fail at 50,000 to 80,000 miles. Other troublesome applications include the intake manifold gaskets on Buick 3800 V6 and Ford 4.0L V6 engines.

INTERNAL COOLANT LEAKS
There are the worst kind of coolant leaks for two reasons. One is that they are impossible to see because they are hidden inside the engine. The other is that internal coolant leaks can be very expensive to repair.

Bad head gasket --Internal coolant leaks are most often due to a bad head gasket. The head gasket may leak coolant into a cylinder, or into the crankcase. Coolant leaks into the crankcase dilute the oil and can damage the bearings in your engine. A head gasket leaking coolant into a cylinder can foul the spark plug, and create a lot of white smoke in the exhaust. Adding sealer to the cooling system may plug the leak if it is not too bad, but eventually the head gasket will have to be replaced.

If you suspect a head gasket leak, have the cooling system pressure tested. If it fails to hold pressure, there is an internal leak. A "block tester" can also be used to diagnose a leaky head gasket. This device draws air from the cooling system into a chamber that contains a special blue colored leak detection liquid. Combustion gases will react with the liquid and cause it to change color from blue to green if the head gasket is leaking.

Head gasket failures are often the result of engine overheating (which may have occurred because of a coolant leak elsewhere in the cooling system, a bad thermostat, or an electric cooling fan not working). When the engine overheats, thermal expansion can crush and damage portions of the head gasket. This damaged areas may then start to leak combustion pressure and/or coolant.

Cracked Head or Block -- Internal coolant leaks can also occur if the cylinder head or engine block has a crack in a cooling jacket. A combustion chamber leak in the cylinder head or block will leak coolant into the cylinder. This dilutes the oil on the cylinder walls and can damage the piston and rings. If the coolant contains silicates (conventional green antifreeze), it can also foul the oxygen sensor and catalytic converter. If enough coolant leaks into the cylinder (as when the engine is sitting overnight), it may even hydro-lock the engine and prevent it from cranking when you try to start it. Internal leaks such as these can be diagnosed by pressure testing the cooling system or using a block checker.

A coolant leak into the crankcase is also bad news because it can damage the bearings. Coolant leaking into the crankcase will make the oil level on the dipstick appear to be higher than normal. The oil may also appear frothy, muddy or discolored because of the coolant contamination.

Leaky ATF oil cooler -- Internal coolant leakage can also occur in the automatic transmission fluid oil cooler inside the radiator. On most vehicles with automatic transmissions, ATF is routed through an oil cooler inside the radiator. If the tubing leaks, coolant can enter the transmission lines, contaminate the fluid and ruin the transmission. Red or brown drops of oil in the coolant would be a symptom of such a leak. Because the oil cooler is inside the radiator, the radiator must be replaced to eliminate the problem. The transmission fluid should also be changed.

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Mar 12, 2010 | 2007 Hummer H3X

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