Mechanics

CHEVROLET SUBURBAN COOLANT PROBLEM

1993 Chevrolet Suburban • 130,000 miles

I have a 93 chevy suburban runs great, but I replaced the heater core, and drained the radiator, I also replaced the thermostat, but by the oil filter thers too little lines that leak antifreeze, and I don't know why it leaks, please help.
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Deltorogeno
January 19, 2013.



Those should be oil cooler lines. They should not be leaking coolant.

Are you sure it is coolant?

Roy


ASEMaster6371
Jan 19, 2013.
Ok yes I'm sure its coolant, its green, I just drained the radiator last night and replaced the antifreeze


Tiny
Deltorogeno
Jan 19, 2013.
What motor?

Roy


ASEMaster6371
Jan 19, 2013.
Do you have a rear heater unit?

Roy


ASEMaster6371
Jan 19, 2013.
Here's a picture


Tiny
Deltorogeno
Jan 19, 2013.
Its a 350 small block and yes iit has rear heating


Tiny
Deltorogeno
Jan 19, 2013.
Those are the oil cooler lines. The coolant is coming from above and dripping onto the lines. The freeze plug above it does not look too good.

Roy


ASEMaster6371
Jan 19, 2013.
Ok, how do I replace the freeze plug?


Tiny
Deltorogeno
Jan 19, 2013.
If that is the issue, drain all the coolant, knock the plug in and then remove with pliers and install the new one. Make sure it is not the intake manifold from the top. Get it pressure tested to be sure

Roy


ASEMaster6371
Jan 19, 2013.
I agree with ASE, those are oil cooler lines. You can see where it is wet above the oil filter and running down. A freeze plug isn't hard to replace. The problem is if you have the room to work. Basically you need to pry out the old one and tap a new one in place.


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