Coolant

1999 CADILLAC DEVILLE
99,870 MILES • V8 • FWD • AUTOMATIC
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ROMERICAN
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I have a 99 Cadillac Deville and it is losing coolant from somewhere because i usually have to fill coolant at least twice a week. It is not mixing with the oil and there are no leak sitings. What could be happening to the coolant? please help
Mar 21, 2011 at 5:34 AM
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RASMATAZ
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If its not leaking anywhere outside the engine could be burning in the cylinders-get it block and pressure tested
Mar 21, 2011 at 5:39 AM
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ROMERICAN
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what kind of places do this?
Mar 21, 2011 at 5:46 AM
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MHPAUTOS
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All mechanics can do a cooling system pressure test, it will take only a few minutes to do.
Mar 21, 2011 at 6:23 AM
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CADIEMAN
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ck. to make sure the coolant jug and hose isnt leakin. also ck. the a/c case drain on fire wall for heater core leakin gl
Mar 21, 2011 at 4:34 PM
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ROMERICAN
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i had it checked and the mechanic said the pressure is good and he didnt find any leaks from any tubes or any other parts. do u think the reservoir cap might be the issue? its an older plastic kind. I could change that and see what happens
Mar 21, 2011 at 8:35 PM
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MHPAUTOS
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Did they check the heater core for a leak? also best get a head check done, this is a simple test for Co in the cooling system, not all small head gasket problems will show coolant in the oil to start with.
Mar 21, 2011 at 9:28 PM
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ROMERICAN
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yea they checked heater core. head was checked and nothing. this problem has been going on for about a year. so shouldn't oil be dirty if it was that long? but i just replaced the reservoir cap and hopefully thats what it is. if u have any more suggestions let me know, please?
Mar 21, 2011 at 11:04 PM
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MHPAUTOS
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Small leaks can be vaporised out the exhaust, do the head check.
Mar 22, 2011 at 1:40 AM
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ROMERICAN
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i did. and it is not a small leak. i lose about an entire tank in about a day and a half.
Mar 22, 2011 at 3:29 AM
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RASMATAZ
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Its leaking somewhere could be the head-I recommend magnafluxing it for hair line cracks-
Mar 22, 2011 at 4:44 AM
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