lot's of crap pumps being sold these days
Keith mite have nailed that one. Those fittings are a known fail on these Vortech motors.Water line from the heater to the intake passenger side number 2-4 cylinder. Your fitting is going bad.
Good guess, but nope. Surprisingly, the original fitting is still working.Water line from the heater to the intake passenger side number 2-4 cylinder. Your fitting is going bad.

This is the 4th time I've done this intake gasket, last time the mechanic said this manifold wouldn't be good for another repair, the coolant eats the plastic and it's too corroded anymore. So now the hunt is on to replace the plastic manifold with a quality metal one, if it can be found...
If the stock GM gaskets are used I can see that happening. Leaking under pressure could cause the aluminum to erode and give new gaskets a harder time to seal. I've not seen that in the shop or on either of mine, but the idea is plausible.I was always under the impression that the whole thing was plastic...
At any rate, each time the gasket has failed it's been quicker than the last time. I was hoping this one would hold on long enough so I could rebuild the motor.
I'd check the coolant level in the radiator. My son's truck wasn't leaking when I got to it so I could check it out. But once I got a gallon and a half dumped in the SOB started pissing coolant out the rear and front corner on the passenger side as fast as I could pour it in. Keep this in mind too, it's just as likely to leak into the valley as it is to leak out on the ground. I'd check the oil for signs of coolant getting in.
What are you using as a monitor?
Next, the radio. I never really cared for the factory radio in these things, sound wasn't great and not much adjustability in the sound. Bass and treble, that was it. I like my tunes and I like good sound. I realize this is not a quiet ride by any means, but still, good sound is good sound. But, I hated the way a single din aftermarket piece looked in the dash, it just screamed "aftermarket!" Not that a double din radio doesn't...
So, I decided on a double din radio for many reasons: first, it has backup camera capability. Second, I can put a nav system in it. (Though right now my Magellan roadmate is still working) Thirdly, the sound output from this unit set back indefinitely the need to upgrade the speakers. And I can tune the sound through 10 channels, like it should be. Problem was, I had to make it fit, which was no easy task. First I went to the junkyard and picked up a broken dash out of a similar truck to do measurements and practice cuts, then I hacked an aftermarket single din install kit to work, then I hacked my dash in the right places to make it fit, and voila! I have a fairly decent looking install. I was going to use some plastic and filler putty to fill in around the holes beside the unit, but forgot about it and now I don't really care. Function over form I guess...
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