1997 Chevy C1500 Suburban 5.7 liter TBI vortec engine. Mystery coolant leaks.

[LindaK]

I have two mystery coolant leaks. One is at the radiator where the top oil coolant line is and the other one is under the vehicle on the passenger side. The second one is very hard to locate because I can't find full coolant hose and connection diagrams. Please help.

 

[Jsdirt]

The leak at the upper hose could be as simple as tightening a worm clamp, replacing a spring clamp ... or the hose has reached the end of its life, and/or the nipple where it lives needs a good cleaning. 

 

There are a couple failure-prone pot metal with plastic insert heater hose connections on the intake manifold - that could be running down the side of the block, along with these crappy plastic heater core connections at the firewall. The hoses themselves could be done for, too. Also could be weeping out of a leaky head gasket.