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Always use 50/50 antifreeze, unless u live in an area where temperatures drop below the stated protection zone. As for the heat, low coolant will cause no heat, as well as a possible vacuum leak that will not allow the diverter door inside ur dash to open. If it's not something simple as adding coolant, I reccommend taking it to a service center you trust. It can be quite trying to figure out all the different possibilities.
I would try back flushing the heater core, i've run into this a few times on these cars and the core was plugged, its wroth a try, all you need is a waterhose and remove the two hoses to core and flush water through both hoses until you get a clean stream of water then try the heat.
Over heat is caused by poor circulation of coolant. This problem can be:
1- The thermostat is not opening ( bad) causing coolant stagnant.
2- Water pump is bad, not circulate coolant.
3- Radiator is clogging up. It is full but water can not going through small clogging up tubes inside to have heat dissipated through the fines.
Since you also have no heat then I think the bad coolant causing the heater core clogged up also, unless the heater valve has a problem not allowing cooling flowing through the bypass hose to the heater core. Correct all 3 things above then you should be OK. Good luck.
Poor heat does it mean your fan blower is not blowing on all the positions low med high. Make sure Radiator is full of water. Thermostat may not be opening. Replace it. Heater control vale may be defective. tell us more
1st make sure the heated core is getting hot, do this by feeling the hoses under the hood that supply hot coolant to the core, if the inlet and outlet are hot then the core has circulation and is not the problem, check this and let me know what you find.