loosing coolant no leaks

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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, loosing coolant no leaks in Past Cadillac Vehicle Discussion; "00deville. new radiator tstat waterpump. losing antifreeze but no leaks. hose is hard to the radiator ,until cap is loosened ...
  1. #1
    sglenn is offline Cadillac Owners Member
    Join Date
    Apr 2013

    loosing coolant no leaks

    "00deville. new radiator tstat waterpump. losing antifreeze but no leaks. hose is hard to the radiator ,until cap is loosened off tank & pressure is released then it softens up.no mechanic can tell us exactly what the problem is. please help we keep spendin..."

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  3. #2
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2006 STS V8 AWD, '95 Ford Ranger
    Join Date
    Jul 2004
    Fairbanks, Ak

    Re: loosing coolant no leaks

    You'll get better results posting down in the dedicated Deville section. It sounds like you have blown head gaskets to me. Check the coolant with a block test kit from the parts store.
    Don't mess with Binky Bear!

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
    Automobile(s): 2002.5 F55 STS - 66500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: loosing coolant no leaks

    This has nothing to do with Site news or registration. please read the text in exac forum banner to find out what is supposed to be posted there.

    Please update your profile with your car model, year, and maybe your approximate location. It makes diagnosis much easier if we know that we're dealing with a Deville right off the bat instead of with a jeep.

    Moved to the proper Deville forums.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: loosing coolant no leaks

    Coolant loss with no external leaks is not good. How fast does the coolant need to be replaced? There are a few places that can leak and evaporate before dripping and are very hard to see like the radiator side tanks. Are you overheating? If not, borrow a pressure tester from AutoZone and pressurize the system (cold). If it does not hold pressure, keep pumping it up until you find the leak. If you are overheating, then borrow a block test kit from AutoZone and just pay for the test fluid. Run the test after an overheat episode.

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