I replaced my t-stat (with a 180) and lost plenty of coolant. Topped it off and fired it up, but it doesn't go down. My engine starts to surge and coolant rises and falls out of the housing. (still haven't figured that out, I think it needs tuned, but it's been on jack stands for a while now). When I squeeze the hoses it also spills out of the housing. I shut off the car and I can hear coolant falling down (as in flowing through the engine). But my upper and lower hoses feel empty. My temp needle stops under halfway.
Is my water pump shot? I've replaced plenty, but only as preventative maintenance, I don't personally know the symptoms of a failed one.
I also have this:
I imagine something should be plugged into it?
I did plug the wires back into the housing btw.