Upper intake manifold leak

Hello Alex,
Thank you for the fast reply! That old hose had a hairline crack on the backside that I could not see. It's probably the original hose. Part is ordered, along with a new fan. Many cracks on the hub of that plastic fan. I am surprised it has not broken up and ruined the radiator!

Is that EGR tube permanently attached to the upper intake manifold? One of the EGR mounting bolts is sheared off inside the mounting bracket, and it's too tight a spot for me to get some vice grips around the back of that broken bolt to thread the remainder of the bolt on thru, or try using a bolt extractor. It looks to me like there is some blue coating on the broken bolt? The other bolt seems to be stainless steel. Picture attached.

Hello Alex, sorry for the lapse in getting back to you. It turned out that the coolant leak was also coming from the (lower) intake manifold. I replaced both upper and lower intake manifold gaskets, fuel rail gasket, injector o-rings, the o-ring at the EGR tube going up to the upper intake, o-rings at the throttle body and IAC valve, PVC tube, put in new plugs and wires and fixed the broken off bolt at the EGR valve mount by knocking off the nut that was spot welded to the backside and just used a bolt and nut with washer and a lock washer. The engine runs like a banshee under load but still idles rough. I acquired a BlueDriver OBDII scan tool, and it's showing P0133, O2 Sensor Circuit Slow Response Bank 1 Sensor 1. I did a live data scan on O2 sensor voltage. 0 volts on ALL O2 sensors. Since the coolant issue is fixed, I'll try to figure out how to add fixed to this thread and start another one for the oxygen sensor issue. Thank you so much for the diagrams and your help!