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1989 Sedan DeVille is now just a fond memory ....
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It might also be, as someone stated in another thread, coolant that was spilled on the engine and stuck in a pocket. It takes longer for the coolant to evaporate or dry up than water and you will smell it until it has dried or is washed away.

Once you have double checked for leaks in your system and are satisfied that there are none you might want to hose your engine down (Cold) to rinse out any residule coolant.

One other thing, did the shop that performed the service add the GM pellets or the Barsleak equivalent? This is very important for the health of your engine and cooling system. If they did not add them you can do it yourself at any time.
 
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