Oh, no worries man!
The coolant elbow can be found at Autozone in the "Help" section. It'* a 2 pack. One fits, the other doesn't. Cost'* about $5. Here'* the kicker. 1 of 2 things need to come off to change it out. Either your UIM and LIM have to come off, or the pulley with the coolant hoses have to come off to replace the elbow. Now depending on what year your car is, it would be recommended that you remove the the Upper and Lower Intake manifold to do this. This will allow you to replace those constantly failing gaskets.
Now, about your heat. Do you have manual heat or AUTO electronic system?
1997 Pontiac Bonneville SEi-SCRAPYARD
2000 Chevrolet Blazer LT 4X4 4.3L
2002 Chevrolet *-10 LS Ext Cab 4X4 5.7 V8