308GT4 Coolant change | FerrariChat
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308GT4 Coolant change

Discussion in '308/328' started by Bhagwan Phagash, Aug 21, 2021.

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  1. Bhagwan Phagash

    Bhagwan Phagash Karting

    Jun 13, 2005
    54
    Hampshire UK
    #1 Bhagwan Phagash, Aug 21, 2021
    I have to change my coolant but cannot undo the engine block drain tap and daren’t force it with excess leverage. If I just drain the radiator, does anyone know how much will remain in the system, and need I be concerned about what was left in there?
    I was going refill with an OAT 5yr product but decided to stick with traditional Bluecol after reading that OAT is not recommended in older cars.
     
  2. GT4andMore

    GT4andMore Karting

    Oct 23, 2020
    66
    Full Name:
    Graham
    #2 GT4andMore, Aug 21, 2021
    I did this recently and faced the same problem. I removed the bottom hose from the radiator, and the filler cap in the engine compartment, and jacked up the back of the car. I think all the old coolant drained although cannot be sure. I refilled with Prestone which was on a great offer at Tescos (in the UK). Refilled and bled the system via the top hose on the radiator.
     
  3. Bhagwan Phagash

    Bhagwan Phagash Karting

    Jun 13, 2005
    54
    Hampshire UK
    #3 Bhagwan Phagash, Aug 21, 2021
    It looks like that Tesco deal is on until the end of the month, £7 for 4L is an absolute bargain. Thanks for the tip, I'll be off to get some tomorrow.
     
  4. absostone

    absostone F1 World Champ
    Silver Subscribed

    Jul 28, 2008
    10,023
    #4 absostone, Aug 21, 2021
    Iirc the car takes 5 gallons.
     
  5. tuttebenne

    tuttebenne F1 Rookie

    Mar 26, 2003
    3,218
    Bay Shore, NY
    Full Name:
    Andy
    #5 tuttebenne, Aug 21, 2021
    I just drained and flushed my 308GTB in preparation for a water pump and replacement of all coolant hoses. When you talk about the block drain are you referring to the plug under the exhaust header pipe almost on the corner of the block on the water pump side? It is not a petcock - it is a plug. It takes a 17mm wrench to remove it. The same thing is at the radiator unless someone has replaced it at some point. They both should unscrew. My system once fully drained took almost 6 gallons of fluid to refill it.
     
  6. francisn

    francisn Formula 3

    Apr 18, 2004
    2,015
    Berks, UK
    Full Name:
    francis newman
    #6 francisn, Aug 21, 2021
    I, with a more techie friend, drained and flushed my system about 4 years ago. I can't remember the exact details but I do remember we filled the system with some sort of cleaner then forced it all through with an electric tyre pump pumping into the expansion tank (with a suitable seal made of duct tape). Then refilled with deionised water and Mercedes blue coolant. Not the cheapest but apparently the best. Topped up with water wetter.

    The amount of muck that came out was amazing, but it probably hadn't been flushed for 30 years!
     

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