How bad did I mess up?

This is a generation 3 with an electric water pump Very common for the impeller to skin its armadillo plastic cladding and now that cladding is running in the bore when you're trying to spin the water pump to move water and it chunks out and doesn't like to move so it moves a little bit stops moves a little bit stopped moves a little bit stops it should be spinning round and round and round around around around so you have to address that whether you take the pump off very easy undo the black plastic business on the engine side of the pump pull the impeller out visually look at the damage and you'll post it here be amazed and buy another impeller off Amazon for $24 put that back in the clean hole connect the plug to the water pump use your scanner to bring up the water pump and make sure it spins freely and doesn't make little quarter rotations or eights rotations it spins you hear it whirring now reassemble that back to the engine block fill it up properly on this model you fill it up to the b line on the reservoir or Degas bottle I believe that's right and then when it gets to the correct level the air is burped out it should be sitting on the full mark b is above the full mark I think I have to go out and look at the two dead ones here to tell you but I believe that's correct You fill it up to the highest mark you run the car in the driveway usually I squeeze the radiator hoses which are the hoses that are about an inch and a half or somewhat outer diameter they go from the thermostat housing behind the water pump to the radiator and then out the back of the head to the top of the radiator You squeeze those like your milk in the cow if that's a thing and after you get done and everything is warmed up it should settle at the full mark Make sure all your clamps are effing tight and seated correctly on the barbs obviously then go for a drive and see if you've done any engine damage usually that'll be noted by rattling and funny noises and you'll know if it has It's very common in this model You don't want to be doing this again that is leaving hose barbs loose and blowing hoses off this is an easy engine to destroy very quickly it is not for the same hearted and it is not for people that are looking to keep a car for 500,000 miles and no sir

 

With steam coming out, it obviously over heated from loss of coolant.
"IF" you are lucky, you didn't burn up the engine. Or the coolant pump.

If you pour the coolant in about a cup at a time, and very slowly, then wait 30 seconds
or so to add more, you won't have to bleed the system. And fill up to the "B" line.
Start the car and let the engine run until it shuts off. Check the coolant level, top off
as needed to just above the full line, which is the seam. I always go just above it so I can
actually see the pink coolant and tell where it's at.
And check for leaks. And once again, check that you put everying back together correctly.

ALWAYS, ALWAYS, double and triple check EVERYTHING! And even with that,
you can still miss something. There's a lot of hoses and wires in that area so it's very easy
to miss something.

I've cleaned the egr system several times, and replaced the head gasket. I cleaned the egr system
a month or so back and it wouldn't start after all was back together. I had forgotten to reattach the pcv
valve hose to the manifold.

 

So the clamp was up the hose, ineffective? I wonder, with normal pressure, would it be possible blow that hose off. Could a failing water pump raise pressure? Or head gasket on the way out? Anyway, a hill climb is likely to push the limits.

What’s the miles? And what motivated the EGR cleaning, just preemptive, or were there symptoms, say cold-start rattles, coolant level dropping?

If it’s over 150k miles you’re into head gasket failure zone, and water pump failure as well.