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Q: How hard is it and how much to change out rear freeze plugs?? on 1994 GMC 1500 Pickup

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Massive coolant leak. Looks like its coming from back of block. Running down over starter and flywheel cover from both sides. Coolant comes out as fast as I pour it into radiator. Advice please on what u think it is and labor to have it done or if it can be done in garage with basic tools. I have basic mechanic abilities
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With a good flashlight look where you think the leak is and then have a helper pour some water in the radiator, got to be able to see where it starts leaking. Freeze plugs are easier to see from underneath engine! Crawl up on top of eng. and look as well. 'IF' it is a freeze plug get it fixed, not a 'basic' repair! I say it is something besides freeze plugs, but that's just my guess.
What else besides the freeze plugs do u think It could be? All the fluid was coming down the back of the block. And when I put a gallon and a half in the reservoir to get home 3/4 of a mile, it was all gone in that distance and still running down the back of the block and out of starter.
There is no fluid anywhere on the bell housing but I will check again when I get home from work. Thank you!!!
I just got home from work and starting digging around and you were right. The heater line on the back of the manifold sheared off the clamps and broke the insert into the manifold. Easy fix I can do it in the yard. Thank you so much for your input. Saved me big bucks. I got this shit man. Thanks again
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