New guy with new car, with problems

[suprasforlife]

Hi all, I'm new to this forum and I just bought a 1989 mk3 turbo. I also have a 1983 mk2. My Mk2 is a car that a couple of older people owned and they took really good care of it, it has 278,400 miles on it and still runs and drives like a dream. Everything is in almost new condition. When I found it I sold my vacation time back to work to get it because in the shape it is in I would have been a fool to pass it up.

4 days ago I bought a 1989 mk3 turbo and it too is in very good shape appearance wise. To bad looks don't help it go down the road. I have a couple minor problems like the dash light going on and off randomly, loose wire or a short I'm guessing.

I have a question or two for you all: This is my major concern, The car runs good, it just seems a little hot, I checked the head gasket and it seems fine, no oil in the antifreeze and no external leaks. The temp gauge has never gone above half, but even with it at the 4 o clock mark after the car has been on a while I still have no heat from my heater. I read on another site that this is a sign of a failing head gasket. Is this true? Sounds more like a bad heater core or a bad thermostat to me. The engine does get a lot hotter than my mk2, which has the 5m-ge in it, the turbo gets very hot along with the radiator and just about everything else. Is this normal for everything to be this hot? Or do I have a much bigger problem? The car has 102,300 miles, should I re-tourqe the head or leave it alone?

This is my first turbo supra, and my 3rd one overall. Any tips or advise, or been there done that story would greatly help me.

I do not want to hurt the motor because I know how much they cost to replace, I learned that with the 1986.5 I had.