An EATC air conditioning system has low fan speed operation during high demand situations, like in direct sunlight. Technician A says this is because something is covering the sun load sensor's photo diode. Technician B says a sun load sensor is a variable resistor and can be tested with an ohmmete...
ASE A/C Exam (All Accurately solved)
An EATC air conditioning system has low fan speed operation during high demand situations, like in
direct sunlight. Technician A says this is because something is covering the sun load sensor's photo diode.
Technician B says a sun load sensor is a variable resistor and can be tested with an ohmmeter. Who is
correct? correct answers Both A and B
A gurgling sound is heard coming from inside the dashboard of a vehicle. Technician A says this is air
trapped in the heater core. Technician B says this noise can be caused by a blown head gasket. Who is
correct? correct answers Both A and B
A manifold gauge indicates a system has low discharge pressure. The MOST likely cause of this
condition is: correct answers A damaged compressor reed valve.
The compressor is rapidly cycling on and off on a CCOT (cycling clutch orifice tube) air conditioning
system. Technician A says this condition can be caused by a low refrigerant charge. Technician B says
this could be caused by a faulty clutch cycling switch. Who is correct? correct answers Both A and B
Technician A says while performing a retrofit from R-12 refrigerant to R134a refrigerant, the refrigerant
must be recovered into a dedicated cylinder, they cannot be mixed. Technician B says R-12 refrigerant
functions at higher pressures than R-134a refrigerant does. Who is correct? correct answers Tech A
Technician A says an ambient temperature sensor senses cabin air temperature. Technician B says a
faulty ambient temperature sensor can prevent compressor clutch engagement. Who is correct? correct
answers Tech B
During an initial inspection, the technician notices that one line on the receiver drier is cooler than the
other. This is caused by: correct answers A restriction in the receiver drier.
During a performance test on a CCOT system the manifold gauge indicates that the high side pressure is
low and the low side pressure is high. This is caused by a: correct answers Faulty compressor
An air conditioning system blows only warm air when the heater is on high output. Technician A says this
could be a faulty heater control valve. Technician B says this could be caused by the cooling system's
thermostat. Who is correct? correct answers Both A and B
, Technician A says a fixed orifice tube varies the flow of refrigerant in relation to temperature. Technician
B says a fixed orifice tube is located between the condenser and the evaporator. Who is correct? correct
answers B Only (A fixed orifice tube provides a consistent output, based upon the size of its orifice. It's a
compromise between idle and highway conditions)
Technician A says the expansion valve is located on the inlet port of the evaporator. Technician B says
the expansion valve's temperature sensing bulb is located near the outlet port of the evaporator. Who is
correct? correct answers Both A and B
During a visual inspection an oily spot is found on a hose leading from the compressor. Technician A
says there may be a refrigerant leak in the system. Technician B says today's R134a systems use mineral
oil instead of the older R12 compatible PAG oil. Who is correct? correct answers Tech A Only
An air conditioning system contains a thermostatic expansion valve. The suction line leading to the
compressor is cool to the touch. This indicates: correct answers Normal Condition
All of these are true about an accumulator EXCEPT: correct answers This system contains a thermostatic
expansion valve to meter the refrigerant.
A vehicle has poor air conditioning performance. The customer has added R134a refrigerant to the
system. Technician A says to use a refrigerant identifier. Technician B says refrigerant mixtures are not
recommended, but will not affect system pressures. Who is correct? correct answers Tech A Only
Two technicians are discussing a CCOT air conditioning system. Technician A says the system's pressure
cycling clutch switch contains a bulb placed on the inlet port of the evaporator core. Technician B says a
pressure cycling switch is located on the low side of the system. Who is correct? correct answers Tech B
Only
All these statements are true about a throttle position sensor EXCEPT: correct answers The ECM
disengages the A/C clutch at idle.
(The compressor's clutch is not disengaged at idle, it's disengaged at WOT providing additional power
when needed)
Technician A says refrigerant flows from the top of the condenser to the bottom. Technician B says a
restriction in a condenser can cause damage to the compressor. Who is correct? correct answers Both A
and B
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