ASE T7 Exam Guide: Heating, Ventilation, and Air Conditioning
High side pressure - correct answer ✔✔150-180
Low side pressure - correct answer ✔✔20-40
Squealing - correct answer ✔✔Belts
Hammering - correct answer ✔✔Restriction in the water jacket
Hissing - correct answer ✔✔Leak in the coolant system above the coolant level
Clicking or buzzing from compressor - correct answer ✔✔System over charged
Knocking - correct answer ✔✔Internal compressor damage, loose bolts
One blower speed doesn't work - correct answer ✔✔Bad resistor
High speed fan doesn't work - correct answer ✔✔High speed, fuse, or relay
Sight glass clear - correct answer ✔✔System OK overcharge no refrigerant
Sightglass has foam bubbles or mist - correct answer ✔✔Low on refrigerant ,air may be in the system
Sight glass streaked - correct answer ✔✔Low refrigerant or from Oil
Sightglass clouded - correct answer ✔✔Desiccant breakdown contaminated system
High side pressure - correct answer ✔✔150-180
Low side pressure - correct answer ✔✔20-40
Squealing - correct answer ✔✔Belts
Hammering - correct answer ✔✔Restriction in the water jacket
Hissing - correct answer ✔✔Leak in the coolant system above the coolant level
Clicking or buzzing from compressor - correct answer ✔✔System over charged
Knocking - correct answer ✔✔Internal compressor damage, loose bolts
One blower speed doesn't work - correct answer ✔✔Bad resistor
High speed fan doesn't work - correct answer ✔✔High speed, fuse, or relay
Sight glass clear - correct answer ✔✔System OK overcharge no refrigerant
Sightglass has foam bubbles or mist - correct answer ✔✔Low on refrigerant ,air may be in the system
Sight glass streaked - correct answer ✔✔Low refrigerant or from Oil
Sightglass clouded - correct answer ✔✔Desiccant breakdown contaminated system
