Technician A says that one heater hose is hot to the touch and the other heater hose is cold when the heater core is functioning correctly. Technician B says that the upper radiator hose should be at engine-operating temperature, which is very hot to the touch. Who is correct? 
After treating the expansion valve with a blast of CO2 from a fire extinguisher, you’ve determined that the valve is defective. What part of the test led you to this conclusion?
If both the low-side and the high-side pressures are low, which of these could be the cause?
Technician A says that AC system lines and hoses that are cold have lower refrigerant pressure than warmer lines and hoses. Technician B says that frost on a system component usually indicates a refrigerant leak in that area. Who is
Technician A says that checking ambient temperature as part of an AC performance test is unnecessary. Technician B says that if the AC compressor hasn’t been operating, the high-side pressure should be high and the low-side pressure should be low. Who is correct?
Bubbles are seen in the sight glass of an R-12 system. Technician A says this that indicates a fully charged system. Technician B says that it indicates an empty system, the bubbles being caused by vapor left in the system. Who is correct?
Technician A says that during normal operation an upper radiator hose that’s cool enough to hold means a defective thermostat. Technician B says that water on the passenger side floor often indicates a failed vacuum. Who is correct?
Bubbles are seen in the sight glass of an R-12 system. Technician A says this that indicates a fully charged system. Technician B says that it indicates an empty system, the bubbles being caused by vapor left in the system. Who is correct?
eric and erica have $5.40 between them. If you double the amount of money Eric has and halve the amount that Erica has they would both have the same amount of money. How much money does Eric have?