79 deville 425 coolant capacity??
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 79 deville 425 coolant capacity?? in Past Cadillac Vehicle Discussion; Anyone knows how many QTs of coolant it takes on a 425? Thanks in advance!...
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    vicello93's Avatar
    vicello93 is offline Cadillac Owners Fanatic
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    79 deville 425 coolant capacity??

    Anyone knows how many QTs of coolant it takes on a 425? Thanks in advance!

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    1980coupe's Avatar
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    Re: 79 deville 425 coolant capacity??

    It should say in your owner's manual if you have it. Towards the back

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    lacville78 is offline Cadillac Owners Fanatic
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    Re: 79 deville 425 coolant capacity??

    Service manual says 19.8 quarts, so that's about 5 gallons. Make sure if you're not getting premixed, to use distilled water!

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    Re: 79 deville 425 coolant capacity??

    Distilled water?

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    Yes. No minerals to cause corrosion. Plus, you'll only need to buy half the coolant.

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    Re: 79 deville 425 coolant capacity??

    I have always used water from the garden hose or from inside the house and never had any issues. I usually buy the full strength and then just add water to it

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    Yeah I alway bought the 50/50 mix actually thanks a lot for the info!

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    lacville78 is offline Cadillac Owners Fanatic
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    Re: 79 deville 425 coolant capacity??

    Quote Originally Posted by 1980coupe View Post
    I have always used water from the garden hose or from inside the house and never had any issues. I usually buy the full strength and then just add water to it
    Not good at all! It sucks replacing freeze plugs, and regular water will corrode them. Plus you can get distilled water at the store for around a dollar. There is really no good reason at all to use regular water.

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    So I changed the radiator, thermostat and gasket, all went good! Just the thermostat housing back bolt that was a pain to get it out and in but I got it. Thanks for the info!

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    Re: 79 deville 425 coolant capacity??

    There may be something to using distilled water but the whole entire planet used tap water mixed with antifreeze for many years.

    Dissimilar metals pretty much ensure something is going to corrode over time.

    I used to use 3 gallons antifreeze and top off with water on these cars.

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