When replacing a thermostatic expansion valve power element, what is true concerning the thermal bulb?

Correct Answer: Option B — with steel wool or an abrasive cloth remove oxidation on the bulb and suction line

Oxidation and corrosion on the suction line act as thermal insulators. Cleaning the mounting area with steel wool or abrasive cloth ensures intimate metal-to-metal contact, allowing the sensing bulb to accurately detect suction gas temperature changes.