Coolant level drops
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Coolant level drops in Past Cadillac Vehicle Discussion; Hi, I noticed the other day that my coolant level (overflow tank) was about an inch below the line, so ...
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    r_2016's Avatar
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    Coolant level drops

    Hi,


    I noticed the other day that my coolant level (overflow tank) was about an inch below the line, so I added some, then I noticed that it was a little low again the next day. The car was in storage for about 7 years upto about a week ago, and I do know that the caps rubber o-ring is pretty dried out, I am thinking that air might be getting in to the tank. When the car is running the level does not drop, so I don't think the engine is consuming it; there is no coolant in the oil (oil looks good) and there is no white smoke in the exhaust; no check engine light and the engine seems to be running good; the coolant in the overflow looks good and there are no leaks. Is it possible that a bad cap could cause this; I don't know what else it could be. The car is a 93 Deville with 87000. Thanks

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    MoistCabbage's Avatar
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    It could be the cap, or a slow leak. Caps are cheap, start there.

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    Re: Coolant level drops

    Yes, I found the caps on ebay for short money. Like I said, the caps rubber gasket looked like sh**; it was all dried out, so hopefully that is the issue. I had a similar thing happen with a 97 Towncar; I had the coolant flushed and the next day the coolant was about 3-4 inches below the cold line (it was full when they flushed, I checked), I refilled it and never had any other issues. I am guessing air pocket?

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    I wouldn't even bother ordering online. Get a Stant at a local parts store.

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    Re: Coolant level drops

    Stant is a good brand? I will check Napa, Autozone for them. This car is not a daily driver, so I can leave it in garage until I get the new caps. I don't want to cause any issues with air getting sucked into the cooling system driving around with bad caps. Thanks for your help on this issue tho.

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    brougham is offline Cadillac Owners Master
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    Re: Coolant level drops

    Stant is one of the major manufacturers for those parts. If you want to stick with GM just pick one up at the dealer.

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    Either way, you're talking ~$10-$20.

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    Re: Coolant level drops

    Thanks Guys

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    Re: Coolant level drops

    Stant, Gates, couple of others. Stant and/or Gates is probably the contractor for some AC Delco cooling system parts.

    (When I replaced the w/p drive tensioner pulley it was a Gates product - and identical in every way to the original equipment pulley that failed. I have a spare Stant surge tank pressure cap and, except for the ID sticker, it is identical to the factory cap. Some AC Delco Professional Platinum spark plugs are made by DENSO in Japan.)

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    Re: Coolant level drops

    It might be a small leakage besides a bad cap. Since you say the car was in storage for seven years, why don't you drain and refill your coolant? It'll probably need to be done anyway, and just add two of the BarsLeaks tubes in the radiator when you refill the system. I used to have a small leakage that I couldn't pin-point and that was the solution for me.

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    Re: Coolant level drops

    Two tubes of Bar's leaks G12BP would plug up a Sherman tank. If you have no obvious small nuisance weeps, I would advise against using ANY sort of "stop leak"............ and if a leak, wherever it shows up, is enough to cause noticeable coolant loss in a week or a month then the leak needs to be repaired, not BandAided.

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    Re: Coolant level drops

    As far as I remember there were pellets recommended for use by GM whenever the coolant is drained and refilled. And, there have been threads in the past about it. IIRC the recommendation was six pellets, which will be equivalent to 2 small tubes of Bar's Leaks. And, when you can't find the leaks because they're so small that's the way to go. I wouldn't band-aid if it is a bigger and obvious leak.

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    Gm no longer recommends the use of gm seal tabs.

    They clog up the system

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    Re: Coolant level drops

    Only if you keep adding them or use too much and don't follow the proper maintenance.

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