Results 1 to 10 of 10

Changing coolant in radiator

This is a discussion on Changing coolant in radiator within the General Help forums, part of the LSx Technical Help Section category; I want to drain the coolant in the radiator and pour some new dexcool in. I'm not looking to do ...

  1. #1
    Junior Member Blue2KTA's Avatar
    Join Date
    Apr 2006
    Location
    Lake Worth, Florida
    Posts
    76

    Blue
    2000 Trans Am

    Changing coolant in radiator

    I want to drain the coolant in the radiator and pour some new dexcool in. I'm not looking to do a full flush, just replace whats in the radiator. Do i just open the drain cock, drain it all out and replace with 50/50 ? Will air get into the block if only drain the radiator ?

    Thanks

  2. #2
    Sold: LS1 '85 El Camino ls1camino's Avatar
    Join Date
    Dec 2005
    Location
    Laurel, Maryland
    Posts
    4,977

    2000 Grand Prix GTP
    2000 Trans Am WS6 M6

    There's almost no point in just changing what's in the radiator, it's only 1/2 of what is in your system. If you're dead set on just doing the radiator, then yes, just open the drain and let it empty out, then fill it with what you have in there...DO NOT MIX THE ORANGE STUFF WITH THE GREEN STUFF!!! 50/50 is best. No, air will work it's way out, the system is designed to do so.

  3. #3
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    There is quite a bit of coolant that remains in the block if you simply drain the radiator. The block drains are not all that bad to get to. On the passenger side, the drain is located above the starter. Use a 5/16" allen head on a 9" extension (it may actually be metric, but this had the best fit).

    On the driver side, the drain is a 17mm allen head located above and behind the alternator. The only thing I had to remove was the alternator splash guard. You can purchase a set of large allen head sockets from Autozone for about $12.00.

    There is an air bleed built into the thermostat to allow air to escape as the system is filled. I just did a slow fill over time, adding a bit of coolant every 5-10 minutes, rocking the car and bouncing it on the suspension helps work the air out.

    On start up, just keep an eye on your gauges. You can also feel your hoses (careful of the belts) to ensure that coolant is flowing. If you are going to the trouble of dropping the coolant, it is best to get all the old stuff out. Flushing it is even better (no chemical flush!) and is easiest with the thermostat removed from the housing.

  4. #4
    Junior Member Blue2KTA's Avatar
    Join Date
    Apr 2006
    Location
    Lake Worth, Florida
    Posts
    76

    Blue
    2000 Trans Am

    Thanks for the info guys

  5. #5
    Member egod's Avatar
    Join Date
    Feb 2008
    Location
    Chicago
    Posts
    436

    Navy Blue Metallic
    1999 Trans Am

    when i did mine i just drained it at the radiator, then filled with water and ran it open until it was all water. Then seal it up, top it off with coolant, run it while adding more fluids.

  6. #6
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    Quote Originally Posted by egod View Post
    when i did mine i just drained it at the radiator, then filled with water and ran it open until it was all water. Then seal it up, top it off with coolant, run it while adding more fluids.
    I started to do this, but after several fill and drain cycles it was still running pretty "colored". That's when I said the heck with it and went shopping for a socket to do the driver side drain plug. After I dropped the drain plugs, and realized just how much coolant was still in the block, I was glad I did.

  7. #7
    Member egod's Avatar
    Join Date
    Feb 2008
    Location
    Chicago
    Posts
    436

    Navy Blue Metallic
    1999 Trans Am

    while it was running i kept the hose in the radiator the whole time, only took a few minutes

  8. #8
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    Quote Originally Posted by egod View Post
    while it was running i kept the hose in the radiator the whole time, only took a few minutes
    Did you have the thermostat out, or were you using hot water? Seems like the cold water would close the stat and not allow the coolant to circulate through the block.

  9. #9
    Member egod's Avatar
    Join Date
    Feb 2008
    Location
    Chicago
    Posts
    436

    Navy Blue Metallic
    1999 Trans Am

    i belive i had my thermostat out but had the housing in still and everything connected

  10. #10
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    Quote Originally Posted by egod View Post
    i belive i had my thermostat out but had the housing in still and everything connected
    That's how I did it. I gutted my old housing, then just started the engine to circulate the coolant. Also kept the heater set on "hot" to flush the core. Once it cooled down, I drained everything again and repeated this cycle a few times until the water ran clear.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Coolant not being drawn back into the radiator. HELP
    By bobh13908 in forum General Help
    Replies: 5
    Last Post: 10-26-2011, 09:20 AM
  2. Changing radiator????
    By Roman nj. in forum GTO
    Replies: 6
    Last Post: 08-04-2011, 04:22 PM
  3. Question: Coolant in the radiator
    By Conflict in forum General Help
    Replies: 5
    Last Post: 04-03-2010, 03:44 PM
  4. Problem!! Coolant Boils In Radiator!! HELP!!!
    By L3THAL_Z28 in forum General Help
    Replies: 32
    Last Post: 08-31-2008, 10:48 PM
  5. Replies: 23
    Last Post: 06-19-2007, 08:28 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •