Could be water rail running around back of motor,,,could be heater core or hose . just some things to check...Could not be manifold gasket but maybe head gasket....
SOURCE: Trouble shoot 1988 Chevy s10 Tahoe v6 2.8 l
going by age of motor it sound like a "core plug" which has rusted, they love to put one in the block that covered by the fly wheel, if it is, when it goes it goes,!! this would mean removing the trans and plate to see, easy to fix when found, best to replace as many as you can and when done always use a coolant that stops rust, there is no quick fix that works on core plugs
SOURCE: 03 Tahoe, idles down, shuts off, gas pedal
Have someone listen at the gas cap for the fuel pump humm when you first start the motor and keep listening if it stops hummimg. The piump may wok when there is low pressure in line and stop after build up of pressure.
SOURCE: coolant leak on driver side of engine in the back
Its possible that you not over heated recently, but I'm wondering if you've checked your oil
recently for the presence of coolant? It will make the oil "milky"
looking. If you've got something like this, you may have a serious
problem with the head gasket leaking... in which case you would probably
have really low engine pressure.
If you've eliminated these possiblities, its more than likely just a
minor hose or manifold leak. Check for splitting of any hoses near the
water necks.
Keep in mind that stop leak
does not know the difference between a leak, or a small water passage
that if plugged could reduce the ability to cool. Radiator, and heater core passages can be fairly small, and if they get
plugged up with tis stuff, you could create an even larger problem.
As far as the leak is concerned, be sure that it is not a heater hose, or one of those pesky quick release connections.
Since you mention the leak on the driver side, it might be something else.
You should inspect the intake and be sure that the water is not running
from another place to the rear of the engine, and it only looks like the
leak is back there. In a worst case situation, there is a freeze plug on the back of the
head, and if this has reached the end of its life, it as well as others
will have to be replaced.
Keep us updated.
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what size motor
5.3 v8 Flex Fuel
It leaks right by the trans on the right side rear. I'm thinking manifold gasket
glad you found it and thanks for the rating
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