My truck has a coolant leak that I cant find. The coolant that is leaking is mostly on the front of the alternator and air cond. pump. I cant seem to find the weep hole on the water pump. Can anyone explain where it is? Any other tips on finding the leak?

 

Might want to check the rubber hose that connects to the steel tube. I had a friend thats where his was leaking. A week later the one on the rear under the exhaust manifold started to leak. Just a Thought

 

If you have access to a compressor, pressurize the radiator and see what happens. No more than normal driving pressures though.

 

I had the same problem. Put a hose clamp on the overflow tube that is right under the cap that goes to the overflow bottle... see what that does. I had coolant puddle in the grooves in the airbox, too.

 

Thanks for the ideas. I will go out and see what I can find right now. I have a air compressor and would like to try the pressure test. Where do I connect the air line and with what fittings? How much pressure is safe?

 

Remove the cap, stuff a rag in there with the air chuck and let it rip. If you have a pressure reducer on the compressor, set it 10-15 psi. If not, then just be careful, you don't want to over-do it. Let us know how it works.

 

Need a lev-r-vent cap and a piece of hose w/ clamps to adapt where the overflow hose connects on the radiator. Don't go more than 12 lbs. to be safe.

 

How does the rag stop the air from coming out? What the heck is a lev-r-vent cap? You guys are kind of confusing me. What if I pull the overflow hose from the overflow bottle and put the air chuck on that?

 

I pulled to hose from the overflow bottle and put my air chuck on it. I have a good seal at that connection. I have 12-15 psi in there and cant find coolant leaking anywhere. I can see some rusty crud on the engine block just below the water pump, but don't see any fresh fluid. I think it is probably the water pump, but I cant confirm it. I still for the life of me cant find the water pump weep hole. Where the f is it. I have a mirror and flash light and have been looking and feeling around with my hand and cant find it. Whats next?

 

Your cap is going to stop air flow, which is why I mentioned one of these:

 

Thanks, so if I use the lev-r vent I will be able to pressurize the system with the tube from the overflow? And if I use the stock cap the system will not pressurize through the overflow tube? Thanks for the clarification.

 

Yes and yes.

 

when my water pump went bad it was peeing fluid out of the pump where the pulley shaft goes in...

 

How risky is it to pressurize the coolant system? I have a compressor and a regulator on it. The guy at my auto parts store thought it was a bad idea unless I used the system designed for it. I dont see how I can harm anything as long as I keep the pressure low like suggested.

Thats good to know about where the one poster above said about his leaking from the pulley. I would say there is a good chance that is where my leak is as well.

 

As long as you keep the pressure under 16 lbs, I don't see what it can harm.