Check for unusual vibrations or noises. If excessive, remove from service and have cause corrected.
THERMOSTAT. Check thermostats and seals annually, (preferably at the time the cooling system is prepared for
winter operation). Replace the seals if necessary; if seals are functioning properly, the barrel of the thermostat will
be lightly polished over the sealing area.
BLOWER AND SCREEN. Inspect the blower and screen annually and, if necessary, clean the screen in fuel oil
and dry it with compressed air. Install the screen and gasket assembly with the screen side of the assembly
toward the blower.
Inspect for evidence of blower seal leakage.