You're going to have a bad experience if you're always setting it to max cold or max heat instead of just picking a comfortable temperature in the middle and letting the car get to that temp.
That's the issue. Suppose the car is at an ambient temperature of 50 degrees. I get in and start it up. I want air that's just slightly warmer than ambient but I can't get it. If I set it to 65, I get hit with air that's probably 90 degrees until the whole car hits 65, meanwhile I'm sweating like it's high summer. If I set it to Low, the only setting below 65, it turns me into a frozen dinner. Generally I'm forced to keep the AC off and just be slightly cold because I have no direct control of the air that's hitting me. There's no way to tell the car to blow slightly warm air if the ambient temperature is below 65 degrees.
That's the issue. Suppose the car is at an ambient temperature of 50 degrees. I get in and start it up. I want air that's just slightly warmer than ambient but I can't get it. If I set it to 65, I get hit with air that's probably 90 degrees until the whole car hits 65, meanwhile I'm sweating like it's high summer. If I set it to Low, the only setting below 65, it turns me into a frozen dinner. Generally I'm forced to keep the AC off and just be slightly cold because I have no direct control of the air that's hitting me. There's no way to tell the car to blow slightly warm air if the ambient temperature is below 65 degrees.