Mitsubishi Repair: Heater problem, coolant tank, coolant level

Question
QUESTION: Hi , Linda
I have recently purchased Mitsubishi Galant ES 2002 Model Car. Car has 45000 Miles. The problem is in a hot air. My A/C is working very good , But when I try for hot air (Turn heater on ) There was only Air is coming instead of Hot air. Please give me advise on same Thanks.
Ajitkumar

ANSWER: Ajtkumar: You need to have the thermostat checked on your car. Sounds like it is bad. Also make sure you have enough coolant in the system. Though two things would go a long ways in helping your car put out some heat. Hope this helps and good luck! Linda

---------- FOLLOW-UP ----------

QUESTION: Hi Linda,
Thanks for nice reply.
I had checked my coolant level. The rediater is full with coolant but the sources of coolant( A white tank on left side of the engine, Which I understand coolant tank right) is lower than the level. So I need to replace all the coolant or without removing all coolant from radiater and tank just add extra coolant up to lavelin tank. What type of coolant I use.
Plase give me advise on same
Thanks once agian
Ajitkumar.

Answer
Ajitkumar: Where ever you live, check with the stores there. I don't know your weather, but they should be able to tell you what kind is good. You don't need the most costly though. Something that is 50% water and 50% coolant till winter will work. But still you should get that thermostat checked too, that could be what is keeping the car from putting out any heat. You can just add to the white tank, look on the side it will show what level it should be when the car is cold and what level it should be when hot. But always add when the engine is cold. If you still don't get any heat from your car, then replace the thermostat and I believe that will fix you problem. Hope this helps and good luck! Linda