* Blend Door Actuator: This small motor controls the blend door, a flap inside your dashboard that mixes hot and cold air. If it's malfunctioning, it might be stuck in the "full cold" position. On max AC, the system overcomes the actuator's limitations and forces cold air through. On normal settings, however, the actuator's failure prevents the blend door from adjusting to mix in warmer air.
* Blend Door Cable (Less Likely): Some older vehicles, even from 1995, might use a cable instead of an actuator. If it's frayed, broken, or stuck, it would produce a similar result.
* Vacuum Line Issues (Less Likely): The blend door might be vacuum-operated (though less common than a dedicated actuator in that year). A leak in the vacuum line could cause inconsistent operation.
* Temperature Sensor Problems (Less Likely, but possible): A faulty temperature sensor could provide incorrect readings to the climate control system, leading to unusual behavior. This is less likely to cause *only* the problem described, though.
In short: The most probable culprit is a faulty blend door actuator. It's relatively common for these to fail over time. You'll need to diagnose further to determine if it's the actuator itself, its wiring, or another related component. A mechanic or experienced DIYer could help with this diagnosis and repair.
