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Coolant

Tiny
ROMERICAN
  • MEMBER
  • 1999 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 99,870 MILES
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
Monday, March 21st, 2011 AT 5:34 AM

10 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
If its not leaking anywhere outside the engine could be burning in the cylinders-get it block and pressure tested
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Monday, March 21st, 2011 AT 5:39 AM
Tiny
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  • 5 POSTS
What kind of places do this?
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Monday, March 21st, 2011 AT 5:46 AM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
All mechanics can do a cooling system pressure test, it will take only a few minutes to do.
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Monday, March 21st, 2011 AT 6:23 AM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
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
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Monday, March 21st, 2011 AT 4:34 PM
Tiny
ROMERICAN
  • MEMBER
  • 5 POSTS
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
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Monday, March 21st, 2011 AT 8:35 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
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.
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Monday, March 21st, 2011 AT 9:28 PM
Tiny
ROMERICAN
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  • 5 POSTS
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?
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Monday, March 21st, 2011 AT 11:04 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Small leaks can be vaporised out the exhaust, do the head check.
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Tuesday, March 22nd, 2011 AT 1:40 AM
Tiny
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  • 5 POSTS
I did. And it is not a small leak. I lose about an entire tank in about a day and a half.
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Tuesday, March 22nd, 2011 AT 3:29 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Its leaking somewhere could be the head-I recommend magnafluxing it for hair line cracks-
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Tuesday, March 22nd, 2011 AT 4:44 AM

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