I have a 1993 sc300 and im having some overheating problems.. First off the heter wont get hot its mostly cold second im building pressure in my cooling system third i pulled the thermostat and it had holes drilled in it and fourth i did a compression test on it and came to 119-123 all across the cylinders and i dont burn any oil or smoke any ideas

 

Any coolant in the oil? Sounds to me like you've over heated it 1 too many times and blown the head gasket. Compression accross the board is way below normal....sould be +170psi. Perfom a leakdown test but be prepared to pull the head and inspect.

 

Your heater core might be clog...connect the inlet n outlet heater hose together to test your problem