1996 Pontiac Sunfire Overheating engine

My car is overheating, prior to this, I had a leak from the upper radiator hose, so I took it to a garage, had that replaced, on the way home it overheated. I checked the fluid on the ground, it was yellow, the fluid in the res. is pink/red dexcool, radiator is cold, hose from radiator to res is cold, hose from engine to radiator slightly warm. Fan kicks on about 240, so that works, can anyone tell me if my thermostat is bad or if coolant is not passing through the radiator, I am not an expert and very low on funds now. Any ideas would be helpful. Thanks
Becky