Why does cooler sound crackling at low (17-19C) ambient temperature?

There's an HP 250 G6 laptop with ~3y of moderate and careful usage (main situation described in detail here) presenting a crackling cooler sound upon bootup at ambient temperatures below 19C. To eliminate the sound at bootup I use an infrared Phillips lamp designed for heating vivariums for reptiles and other animals. I place the lamp at 20-30 cm near the cooling vent located at the left side of the laptop and after 2-3 rounds of 5min infrared heating the sound terminates. But then while working for hours on this laptop, if I do not keep the ambient temperature at ~20C and more by means of electric heater, the crackling sound reappears.

I was curious about the logic behind such behavior of the cooler, and also would like to inquire in advance before disassembly, whether the cooler may need some oil like WD-40 or grease, or should I plan for the cooler replacement. Is it a crappy HP design, or can it be expected in other laptops like Dell or Acer?

Recently I had a brief read about someone having fixed their monitor with a hairdryer, and a comment mentioned that this person might have actuated electrolytic capacitors by heating them with a hairdryer.