Filling radiator and block systems
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Filling radiator and block systems in Past Cadillac Vehicle Discussion; what is the proper way to fill radiator on 1998 eldorado. ---------- after installing waterpump...
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    98eldorado-lee is offline Cadillac Owners Fanatic
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    Filling radiator and block systems

    what is the proper way to fill radiator on 1998 eldorado.

    ----------

    after installing waterpump

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    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    Same as you'd fill it any other time, the fill cap on the surge tank. Fill it cold, to the FULL COLD line on the tank. The system is self purging.

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    98eldorado-lee is offline Cadillac Owners Fanatic
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    Re: filling raditor

    cool, thanks. An update on that waterpump. the waterpump was bad. Thanks moistcabbage. So far no leaks.

    ----------

    Thank moistcabbage, sub, range. you guys are a huge help. thanks, Lee.

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    Ranger's Avatar
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    Re: filling raditor

    Remember, after you start it the coolant level will drop as the WP purges the air from the system, so be ready to add as it drops. Then rev it to about 3K and hold it here for a few seconds a couple of times until the coolant level stabilizes. Do this before it reaches operating temperature or it is likely to boil over. Check it again after the next 2-3 drives and don't be surprised if it needs another top off or two.

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    oldstuff is online now Cadillac Owners Fanatic
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    Re: filling raditor

    I always elevate the hose that goes on the thermostat housing and pour the coolant into it until it starts to dribble out of the housing, then put the hose on and fill the tank to the top. There will be enough air in the system to bring the level down to where it belongs. Check and correct after a couple trips. If there isn't enough coolant it will tell you.
    Dave


    Quote Originally Posted by Ranger View Post
    Remember, after you start it the coolant level will drop as the WP purges the air from the system, so be ready to add as it drops. Then rev it to about 3K and hold it here for a few seconds a couple of times until the coolant level stabilizes. Do this before it reaches operating temperature or it is likely to boil over. Check it again after the next 2-3 drives and don't be surprised if it needs another top off or two.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: filling raditor

    How do you get coolant to flow past the Northstar closed thermostat - to the block and heater circuit, and how does coolant flow across the radiator core and UP to the top radiator hose in order to flow back across and down to the water pump ? The thermostat in a Northstar is between the "lower hose" and the water pump inlet. You must fill the entire block/heater circuit before any coolant begins to fill the radiator.
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    oldstuff is online now Cadillac Owners Fanatic
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    Re: filling raditor

    I had to go look--take the upper hose off at the engine end and fill there until water comes out of the place you took it off of. ( not thermostat housing)
    The water goes directly into the radiator then through the bottom hose to the thermostat housing. Not sure how it gets past that but maybe a bleed hole or the heater circuit but it worked every time I tried it. I don't have an extra cross over /thermostat housing to look at. Maybe you have a breakdown picture in your collection.
    Dave

    Quote Originally Posted by Submariner409 View Post
    How do you get coolant to flow past the Northstar closed thermostat - to the block and heater circuit, and how does coolant flow across the radiator core and UP to the top radiator hose in order to flow back across and down to the water pump ? The thermostat in a Northstar is between the "lower hose" and the water pump inlet. You must fill the entire block/heater circuit before any coolant begins to fill the radiator.

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    Submariner409's Avatar
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    Re: filling raditor

    Here's the water crossover and thermostat housing. With the surge tank cap off you can backfill the system through the upper radiator hose. There will still be a significant amount of air in the heater circuit - that purge requires either dedicated pressure filling at the heater circuit or some judicious engine rpm work coupled with surge tank level observation.

    Also see the sticky on cooling system operation in Engines; Northstar.

    SOME Northstar thermostats (OEM and replacement) have a jiggle valve, some don't.
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    Re: Filling radiator and block systems

    You're making it harder than need be Dave. Just fill the surge tank, start the engine and add coolant as it goes down. When it stops, fill it 1/2 - 2/3, cap it up and top off as necessary after a drive.
    rodnok01 likes this.

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    MoistCabbage's Avatar
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  12. #11
    oldstuff is online now Cadillac Owners Fanatic
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    Re: Filling radiator and block systems

    I tried it that way the first time and it was fill-wait fill-wait fill-wait so the next time I used the hose trick and it filled faster. I think it bypasses the thermostat through the heater system. Works without the engine running and ends up with enough coolant that the heater works when you do start and warm the engine.
    To each his own.
    Dave


    Quote Originally Posted by Ranger View Post
    You're making it harder than need be Dave. Just fill the surge tank, start the engine and add coolant as it goes down. When it stops, fill it 1/2 - 2/3, cap it up and top off as necessary after a drive.

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