This is a common problem with these vehicles. My mom has a 92 EX 4-dr and my dad has a 92 EXR 2-dr and both had this problem.
For a temporary solution you can adjust the temperature under the hood near the firewall you can find the cable running to the heater box.
On both vehicles we had to change the knob for the temperature selector and we also changed the cables while we were at it.
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