Dsl lights/air conditioners

I haven't had my morning coffee, did you mean drl lights? Intermittent issues can be hard to track down. You have to test when problem is ongoing. Voltage to the headlamps is hot all the time, on/off, hi/lo, drl are controled on the ground circuit. I'd test for voltage and ground when the problem is ongoing. Any applicable trouble codes? To check those yourself, at the least, you need an obd2 code reader. Some of the national brand autostores used to check codes for free.

As far as the hvac, are you saying the blower motor shuts off?