Question about 1999 Cadillac Seville

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Coolent running hot

My 1999 cadillac is running hot after driving it about an hour. I wanted to know what could be causing this to happen? The coolent is running out of the pressure cap on the tank when the car gets hot.

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Well this sounds like your head gasket has gone if i were you id hope it is this and not that you have got a cracked head as this will be a lot more expensive than replacing your gasket.

Posted on Jul 29, 2008

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1 Answer

Loses coolent


about how much coolant are you losing?

Have you had the cooling system pressure tested?

Apr 02, 2013 | 1999 Cadillac DeVille

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1999 dodge intrepid loseing coolent changed water pump now PO 172 code come s on and runs rough at idel changed plugs,wires,checked timeing marks,vacum leaks Help driving me nuts thank you Tom


Hi,
You need to do a cylinder leakage test. It sounds like you may have a head gasket not sealing properly, and this is where your water loss is going and is causing the engine to run rough also.
A quick test is to remove the radiator cap when the engine is cool, then run the engine till it gets hot and when the water is hot you should start to see the water running along in the radiator. Make sure it is full and make sure no bubbling and squirting of water from the radiator happens. If this happens then it is a good sign that your head gasket needs replacing.
Let me know if you want more information.
Thanks
Jason

Feb 28, 2011 | 1997 Dodge Intrepid

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The heater in my 1988 Cadillac Sedanville is not working, also, after running the car and then leaving it sit while running it started to smoke out from under the hood. The smoke was just steam from the...


Most likely have a coolant leak somewhere. Could be the radiator, hoses, coolant reservoir, water pump. Get it resolved asap, wouldn't want to pull over to have your car rolling in it's coolant..

Jan 04, 2011 | 1988 Cadillac Sedan DeVille

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I just purchased a 1999 Cadillac Eldorado, ETC with a 4.6L V-8 Northstar engine. My engine keeps blowing out the engine coolant through the over-flow hose when I stop at a light or if I let the car idle...


It may be overfilled. Do you keep adding coolant when it blows it out? The reservoir has a line to which the coolant should be filled. If overfilled it will blow out when hot. Other reasons may be that the fan that cools the radiator may not be cycling on and off to keep it cool. Also check the small belt on the right front side of the engine that is under a plastic cover that runs the water pump. It sometimes breaks and the water pump stops turning.

Sep 21, 2010 | 1999 Cadillac Eldorado

4 Answers

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Its possible your thermostat is stuck in either the on or off position. Also its not an expensive part. I would start there first and go from there. Also how many miles are on the vehicle. Also I assume this is a north star engine.
Thanks,
Lee

Jul 23, 2009 | 1999 Cadillac DeVille

2 Answers

1998 cadillac deville overheating


Check for coolant in the oil. The oil will look like chocolate milk. After it's sat overnight you can also try loosening your oil drain plug until fluid comes out. See if it looks like chocolate milk or is just straight coolant. Check your spark plugs. Pull them out of the cylinder head and check for white corrosion or actual coolant in chambers or threads. You can also do a block test (rent the block tester at Autozone for $25.00- return when you're done and you get the $25.00 back) the block test fluid is $8.99. Follow the directions and if your test fluid turns green or yellow you have combustion/emission gases in the coolant. This can be caused by a cracked block/ cylinder head/ blown head gasket. You can also disconnect one head's spark plugs and test that cylinder then the other to see if only one is causing the problem. Hope this helps. If you're losing coolant, it's probably not your water pump. A lot of times if a head gasket fails, the head (usually made from Aluminum) will crack or warp.

Jun 29, 2009 | 1998 Cadillac DeVille

3 Answers

Over heating/ loss of coolent


If you are not loosing coolant on the ground. You may have a problem of a bad intake manifold gasket or worst a bad head gasket. The two things to look at are coolant in your oil, manifold gasket. Coolant out the exhaust, head gasket.

Jul 05, 2008 | 1999 Cadillac DeVille

1 Answer

Cadillac


Check and see if engine is overheating, if so it can be many causes.... Radiator, head gasket, leaks in coolant system...etc... maybe some kind of sensor also, or battery

Jun 16, 2008 | 1999 Cadillac Escalade

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