Question about 1999 Cadillac DeVille

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My car is possibly leaking coolant because when I drive a certain amount of miles every day It tells me to check my coolant level. Today my car overheated and shut off to save the engine. I need to know what may be the problem. Is it the resevoir? Is it a head gasket? Is it a hose? I need to know so Im not out of a car.

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  • Cadillac Master
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You can visually check the 'weep hole' under the water pump, the hoses, thermostat housing, freeze plugs, and the radiator. With the radiator full and the cap off, you can start the engine and look for air bubbles. A steady, regular streem of bubbles can be an indication of a head gasket problem. The heater core is another place it can leak but usually the windows fog up, there's a smell, or the carpet on the passenger side gets wet when that happens. Beyond that, you'll have to get a pressure tester to check the cap and cooling system.

Also, in this link could look to interesnting info: coolant_leaks.

Kep us updated. Good luck.

Posted on Sep 12, 2010

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Driving home last night my car was overheating and going in to limp mode. i also noticed a few days ago that the heaters only work while on the motorway doing 70 mph.


Sounds like you're low on coolant. That's not good, because it being a sealed system, you should never have to add coolant. The level should always stay full. If adding is necessary it is almost certainly leaking somewhere. If you can't see any external leaks on the engine or hoses or radiator, check your oil sump for coolant contamination: pull the oil dipstick and look carefully for milky brown swirls in the oil. That's the color the coolant gets in the oil. Take off the oil filler cap and check there too for a brown sludge. Just precautions because worst case scenario, if that's where your coolant went, it probably means a costly head gasket job.

If it turns out to be low just from neglect, you may be alright, but you need to keep watch on the coolant level for a good 2 weeks or more to be certain it is not losing coolant somewhere. Be sure and bleed the air out of it too, when refilling coolant. I don't think that was what happened, an air lock, as the cause of your overheating, though.

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I
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And don't forget! It's at your discretion to leave a rating!. I always try my best at explaining my answer to your problem.

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