Radiator Drain Plug
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HT4100 4.1, 4.5, 4.9 Discussion, Radiator Drain Plug in Cadillac Engine Technical Discussion; Hi, Got a new 93 SDV with a 4.9 Heater wasnt working so I decided to replace the T-stat and ...
  1. #1
    behind-bars is offline Cadillac Owners Connoisseur
    Automobile(s): 93 Sedan Deville 4.9L
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    Radiator Drain Plug

    Hi, Got a new 93 SDV with a 4.9

    Heater wasnt working so I decided to replace the T-stat and flush the coolant while I was at it. I am also going to make sure the T joint at the top has the proper restrictor, but thats another story.

    I pulled the coolant surge tank and it was filthy, so im cleaning it. But when i pulled the hose off the thermostat you could see the rust build up everywhere and the coolant looked real bad, like brown water. I know the coolant tabs turn it brown, but this had no viscosity at all and i saw some black specs in the coolant so I imagine it hasnt been well maintained.

    I loosened the radiator drain plug and it started to drip, very weak drip at that. I then pulled the screw and washer out and it didnt increase the flow. Does it sound like the drain is clogged? I looked at the FSM and they show 3 parts of the plug, Is the part labeled "body" supposed to come out aswell?

    I really just want to know if its clogged, and if so how would you go about cleaning it?

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  3. #2
    awadecki is offline Cadillac Owners Enthusiast
    Automobile(s): 76 Eldo (54k), 76 Eldo (52k), 78 Eldo (9k), 85 Deville (43k)
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    Re: Radiator Drain Plug

    It could be clogged, but here's a simple solution. Pull the lower radiator hose. I guarantee all of the coolant will come gushing out. Just have a few oil drip pans ready.

  4. #3
    behind-bars is offline Cadillac Owners Connoisseur
    Automobile(s): 93 Sedan Deville 4.9L
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    Thread Starter

    Re: Radiator Drain Plug

    Quote Originally Posted by awadecki View Post
    It could be clogged, but here's a simple solution. Pull the lower radiator hose. I guarantee all of the coolant will come gushing out. Just have a few oil drip pans ready.

    I considered that, but was curious if a blockage at the drain could have any adverse affects. Would you pull off the end at the radiator or the end going into the engine? the engine one looks easier

  5. #4
    behind-bars is offline Cadillac Owners Connoisseur
    Automobile(s): 93 Sedan Deville 4.9L
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    Thread Starter

    Re: Radiator Drain Plug

    Quote Originally Posted by behind-bars View Post
    I considered that, but was curious if a blockage at the drain could have any adverse affects. Would you pull off the end at the radiator or the end going into the engine? the engine one looks easier
    Couldnt get the lower hose off when i tried tonight, Ill try again tomorrow. Right now im just letting the drain empty it overnight.... very slowly

    Wish i could just get the drain unclogged since its easy to access

  6. #5
    behind-bars is offline Cadillac Owners Connoisseur
    Automobile(s): 93 Sedan Deville 4.9L
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    Thread Starter

    Re: Radiator Drain Plug

    Ran some radiator cleaner through it and flushed the radiator by adding water through the fill neck and forcing it out the upper hose hole. The drain is now working much better. When I fill with straight water and run the engine up to operating temp and drain it the water comes out clear now as opposed to brownish tint like before.

    Guess its time to fill it with coolant/water/bars leak and seal it up

    Cool

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