99 aurora, issues with cooling system....
started running hot in the summertime and when idling...i'd keep an eye on the temp gauge and turn the heat to full blast when it got up over normal running temp and it stayed within normal limits. changed the thermostat, still same issues...suddenly noticed a jump in coolant consumption, and it at first, it didn't seem to be leaking out anywhere. then i noticed one day, immediately after shutting it off, it was leaking coolant, but couldn't tell exactly where, it looked like it was hitting a metal piece up under the car and running across that and dripping down. also having grounding issues after replacing the alternator (PAIN IN THE *** to do, btw)...speedometer/tachometer gauges are jumping around. anyways, my main concern is the coolant issues, any ideas on where to go from here? i need guidance. want to keep this baby running as long as i can, i rely on it!