New engine overheating

I've got a 98 mits eclipse rs manual trans 2.0 non turbo. When I got this car it was blowing white smoke using oil like crazy, no milky oil. I took it to a shop and I was told the head gasket was blown. So I just had a different shop put a referb in it. Now its overheating on me. It'll go up to 3/4 up on the temp gauge awhen driving and slowly go back down. Sometimes ill turn the heater on to cool it and it works. Sometimes it'll make it hotter when I turn the heater on. I don't run the a/c. I've put 3 thermostats in it. Still hot. Started using coolant like crazy. Took it to the shop after 1k miles on the engine, they said heater hose had a pin hole and they replaced them. STILL overheating. Drained the radiator, put a new one in it. No leaks that I can see. Thermostat seems to be working, I got bubbles. When they put the engine in it they replaced the water pump as well. The fans come on and off like I think they should as well. I don't know what to do now, any ideas?