SOS Mechanic Certification- HVAC with 100% correct answers (latest update)
what replaced r134a ✔️1234yf
popping and clicking sound behind dash ✔️blen door plastic gears
what make the compressor slip ✔️air gap too big
what will cause blen door to go bad ✔️bad gear teeth
only defrost works ✔️mode door
what happens when 50/50 is mixed ✔️boiling point rises, freezing point lowers
at 90 and 90, pressures read 240 and 42 ✔️normal
ac blows on high only ✔️bad resistor
blower motor inoperative ✔️reversed polarity to motor
bad smell in cabin ✔️evap drain plugged and growth
blower motor spins but no air ✔️reversed polarity to motor
worn bearing compressor ✔️makes noise when the compressor is off and gets quieter as it engages
hybrid compressors ✔️require non conductive oil
very high head pressure is from ✔️condenser
typical low side pressure ✔️25-45
typical high side pressure ✔️170-230 can be up to 260 if hot
what removes heat and moisture from the air ✔️evaporater
ac system should be plugged after it is open to ✔️prevent moisture and dirt from entering the system
noise from a compressor clutch is only heard ✔️when it is engaged
multimeter diagram question with 0.03 volts ✔️answer is not excessive resistance at ground.
when replacing fittings ✔️replace them for the refrigerant
why do you need to clean
a failed compressor ✔️because of evaporator?
✔️
what replaced r134a ✔️1234yf
popping and clicking sound behind dash ✔️blen door plastic gears
what make the compressor slip ✔️air gap too big
what will cause blen door to go bad ✔️bad gear teeth
only defrost works ✔️mode door
what happens when 50/50 is mixed ✔️boiling point rises, freezing point lowers
at 90 and 90, pressures read 240 and 42 ✔️normal
ac blows on high only ✔️bad resistor
blower motor inoperative ✔️reversed polarity to motor
bad smell in cabin ✔️evap drain plugged and growth
blower motor spins but no air ✔️reversed polarity to motor
worn bearing compressor ✔️makes noise when the compressor is off and gets quieter as it engages
hybrid compressors ✔️require non conductive oil
very high head pressure is from ✔️condenser
typical low side pressure ✔️25-45
typical high side pressure ✔️170-230 can be up to 260 if hot
what removes heat and moisture from the air ✔️evaporater
ac system should be plugged after it is open to ✔️prevent moisture and dirt from entering the system
noise from a compressor clutch is only heard ✔️when it is engaged
multimeter diagram question with 0.03 volts ✔️answer is not excessive resistance at ground.
when replacing fittings ✔️replace them for the refrigerant
why do you need to clean
a failed compressor ✔️because of evaporator?
✔️
