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Northstar Engines and System Technical Discussion Discussion, Radiator Flush 02 deville in Cadillac Engine Technical Discussion; You need to read the boil/freeze data for 50/50 ethylene glycol based coolants - it's on the back of any ...
  1. #16
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    Re: Radiator Flush 02 deville

    You need to read the boil/freeze data for 50/50 ethylene glycol based coolants - it's on the back of any coolant jug.

    50/50 mix is the recommended strength by every car maker on earth since they stopped using alcohol-based coolants in the 40's.

    Like it or not, 100% coolant boils and freezes earlier than the 50/50 mix - and, for high temperature operation, GM's highest recommended concentration is 70/30.

    Do some coolant searches and find Ranger's coolant concentration specifications table.

  2. #17
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    Re: Radiator Flush 02 deville

    hi
    Where is minimum level In coolant tank?After when I changed coolant and fill up to max always come down.That normal?Or I losing coolant?Two times happen when engine idling and cut off and when engine idling and seat in car I feel little little shake.RPM OK but slighty feel.???

  3. #18
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    Re: Radiator Flush 02 deville

    Read the fill legend molded into the reservoir top and side.

    Filled to or close to the top, as the coolant normally expands quite a bit as it warms up it blows out the overflow hose. Normal level - when cold - is about halfway up in the reservoir. You never check or adjust coolant level with the engine hot - only when less than lukewarm.

    If the engine stalls when idling, get any diagnostic trouble codes from the car's built-in code reader/scanner. Use the proper section and links in the sticky post just above this - "How to pull codes". Practice, write down all found codes and whether each is Current or History and return to the sticky to open the link of code definitions. Decipher all your P,B,C, and U codes, write it all down, and post it all here.

    ( There are two sticky posts in the Engines; Northstar Performance forum that address cooling system operation. Also, a discussion way up ^^^ in the Cadillac Technical Archive - black bar)

  4. #19
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    Re: Radiator Flush 02 deville

    Ok,I'v found wet place under reservior tank,so I think I put too much coolant.When engine cold I add coolant for max level.After few days I losing 200ml.So is ok?

  5. #20
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    Re: Radiator Flush 02 deville

    After a coolant change you may have to top it off a few times as it purges air out of the system. That's normal.

    If you are filling it to the 1/2 tank level (proper full level) and have a "wet place under reservoir tank", then you have a leak. Probably a cracked tank (not uncommon). That WILL NOT cause a stall.

    As for minimum level (when the CHECK COOLANT message appears) that is somewhere around 1/4.

  6. #21
    gino9's Avatar
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    Re: Radiator Flush 02 deville

    today I seen,when engine hot slowly come out on reservoir tank cap.So not sure he reduce because too much or I'v change cap?

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