my car was overheating, now it won't heat up?

My car is 92 toyota camry. it's temperature used to "normally" run at about 1/4 (of a tank?) sometimes when i drove it was starting to heat up to about half of a tank and 3/4. i put antifreeze in it and now it's not heating up at all and it smells like something is burning.... what's wrong?
 
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