Antifreeze and Engine Coolant
Cadillac Catera
Ford Explorer XLT

What could cause a antifreeze leak when the car is turned off on a 1999 Cadillac Catera?


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2015-07-17 17:55:25
2015-07-17 17:55:25

Check it when it is cold. If it smokes white smoke when you start it, you could have head gaskets leaking.

the pressure is still existant in the radiator..

Usually when the car leaks water when it is off it is because the water pump is weeping.... Starting to go out, you need to replace it

I have had a lot of experience with this one. The design of heater control valve is flawed. The valve snaps together and after a while the pressure in the coolant system will push the top up just enough to leak. As the inner spring gets weaker it leaks more. The replacement valve cost me less than $100 at Advance Auto and took about 2 hours to replace. The valve is located against the firewall on the passenger side of the car.


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If the 1999 Cadillac Catera idles too fast, the cause could be a faulty idle stop solenoid. It may be damaged or it may have become loose. If it is idling rough or seems erratic, the problem could be a faulty EGR valve. Other problems could be a vacuum hose leak or a clogged PCV valve.

1997 Cadillac Catera HelpMost cars have two radiator hoses. One is the upper hose (Usually located towards the top front of the cars engine and sometimes easier to see and get to to replace) and the second located below it toward the middle or side of the engine. Check your hoses first for any cracking, wearing, check to make sure that the clamps are tightened and not loose or broken and are properly placed on hose. If you keep having to replace the antifreeze every few days that is a good indicator that there is a good size leak and may be the cause of your engine overheating as well. The other problem may be that your radiator may have a crack in it and that would mean it definitely needs replacing. Also consider having your cars thermostat checked, this doesn't sound like it is the cause of your problem but is a good idea to have checked. Hope this Helps.Cheryl

This could be an indication of a failing crank sensor. GM has issued a recall for this and you shoudl be able to find out more information from any cadillac or GM dealer.

Not advisable. Any relay that you could unplug could have a multiple purpose and removing the relay could cause other more serious problems. Len

A bad head gasket is the most common cause of antifreeze mixing in the oil. The antifreeze will dilute the oil and it will eventually cause your engine to seize up.

Check with ford dealer or you can buy antifreeze that mixes w/ any types of antifreeze - but check first or you can cause problems

yes, if the Cadillac converter is not working properly it can cause you to loose power and may in the future cause you to loose your engine.

Make sure you are using the correct type of antifreeze. Mixing some environmentally friendly antifreeze with older type "green" can cause gelling. Some antifreeze will gel with age. You may need to flush the entire system and replace with the correct type for your car.

Use the Gold antifreeze. It lasts longer and does not cause corrosion to the cooling system.

i have a 94 cadillac sls and i think i blew a headgasket thers oil in my antifreeze resovar and thers antifreeze in my oil whats the best thing to do does steel seal realy work should i drain both of thoes before i use it Yes, but any sealant that's to be used in the coolant system is for emergency situations. It will cause more problems in the long run than it will fix. From the sound of your problem, you need to see a qualified mechanic.

It should be ok as there is nothing too terrible in the coolant. Excess antifreeze will just overflow. Try and get some out. Antifreeze can cause paint issues if the concentration is high enough...RR

the most common cause would be a stuck closed thermostat.

Yes, low coolant can cause a loss of heat in the cabin.

Find where it is running out and repair the cause.

Interference engine be sure to change your timing belt every 60k miles if not your car is a ticking timebomb with a VERY short fuse it will bend your valves or could cause your engine to seize if the belt fails in any way

Yes. Antifreeze is actually pumped through the intake manifold. If the gasket is bad it is possible that it leaks out

Internal engine antifreeze leak what else could cause besides headgasket? there is no antifreeze in the oil it is clean

Mixing the new red antifreeze with the green can cause it to look rusty and will form a sludge. If someone is topping off your antifreeze recovery tank during oil changes with the wrong product could be one cause.

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