4.9L coolant leak
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HT4100 4.1, 4.5, 4.9 Discussion, 4.9L coolant leak in Cadillac Engine Technical Discussion; I am the original owner of a '92 that has 201450 miles on the engine. My service station tells me ...
  1. #1
    sk92 is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    May 2008
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    4.9L coolant leak

    I am the original owner of a '92 that has 201450 miles on the engine. My service station tells me that the coolant leak is coming from between the head and the block but is not leaking internally. They are recommending replacement of the engine after having installed sealing "pellets" which held the leak for only just more than 1 month. What do you say?

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  3. #2
    cadillac_al is offline Cadillac Owners Connoisseur
    Automobile(s): Cadillac 78 Seville, 78 Coupe de Ville, 92 Sedan de Ville
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    Re: 4.9L coolant leak

    I have never had a car go 200,000 and when/if mine gets there I won't expect much more out of it. This sounds very similar to my Buick 3.8 ordeal I had the past couple years. I tried to trace a coolant leak and it seemed to be coming from between the block and head. Oh well, just another head gasket bites the dust. Well, coolant doesn't usually leak from there. I discussed it with several mechanics and none had ever seen a 3.8 or any other engine leak outside the engine from there. I did some more cleaning and investigating and finally determined that it was leaking from the end of the intake manifold, running down a channel between the head and block, around the corner and dripped of with the wind just like it was leaking from the head. I think if you clean it enough and get enough light on it, you should be able to tell for certain where it is leaking. Good luck.

  4. #3
    sk92 is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
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    Thread Starter

    Re: 4.9L coolant leak

    The engine all but let go the other night with the temp up to 241. My mechanic was able to locate another engine with only 59000 miles on it out of a wreck. I'm supposed to pick the car up tomorrow. He says it runs great and that the engine he found was very clean. He said that when he separated the old engine from the tranny, all kinds of coolant rushed out so it appears that you were correct as to where the real leak was. Thanks for your feedback.

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