ASE HVAC EXAM PRACTICE QUESTIONS
WITH CORRECT ANSWERS 2025
WhatYwouldYbeYtheYmostYlikelyYresultYofYaYmissingYACYcompressorYclutchYdiode?Y-YCORRECTYANSWERY-
DamageYtoYtheYECM
TechYAYsaysYthatYtheYserviceYfittingsYforYR-134aYareYtheYsameYasYtheYserviceYfittingsYforYR-
12.YTechYBYsaysYtheYlow-sideYserviceYfittingYisYaY16mmYquick-connectYandYhigh-sideYisY13mmYquick-
connect.YWhoYisYright?Y-YCORRECTYANSWERY-Neither
AnYinoperativeYcable-
controlledYheaterYcontrolYvalveYisYbeingYdiagnosed.YTheYcontrolYmovesYfreely,YbutYtheYvalveYdoesYnotYresp
ond.YTechYAYsaysYtheYcableYhousingYclampYmayYbeYlooseYatYtheYpanelYend.YTechYBYsaysYtheYcableYmayYbeYru
stedYinYtheYhousing.YWhoYisYright?Y-YCORRECTYANSWERY-AYonly
TechYAYsaysYthatYtheYscanYtoolYreceivesYdataYfromYtheYvehicleYbyYcommunicatingYonYtheYdataYbusYnetwork.
YTechYBYsaysYthatYifYoneYofYtheYtwoYdataYbusYwiresYbecomesYbroken,YthenYtheYnetworkYstillYcommunicatesY
onYtheYremainingYgoodYwireYbutYwillYsetYaYtroubleYcode.YWhoYisYright?Y-YCORRECTYANSWERY-Both
TheYtoolYinYtheYfigureYaboveYisYusedYtoYremoveYandYinstallYwhichYACYcomponent?Y-YCORRECTYANSWERY-
TheYOrificeYtube
ReferringYtoYtheYfigureYabove,YtheYblendYdoorYgetsYjammedYinYtheYmiddleYofYtheYtravelYarea.YWhatYisYtheYm
ostYlikelyYsystemYfault?Y-YCORRECTYANSWERY-TheYHVACYairYtempYcouldYnotYbeYregulated.
WhichYACYrelatedYprocedureYwouldYtheYaboveYtoolYbeYusedYfor?Y-YCORRECTYANSWERY-
TestingYtheYrefrigerantYforYimpurities.
ReferringYtoYtheYfigureYabove,YwhatYwouldYtheYHVACYmalfunctionYifYtheYcomponentYbecameYrestricted?Y-
YCORRECTYANSWERY-LowYairflowYfromYtheYducts.
ReferringYtoYtheYfigureYabove,YtheYACYcompressorYclutchYwillYnotYengage.YTechYAYsaysYthatYtheYACYclutchYre
layYcouldYbeYbypassedYwithYaYfusedYjumperYtoYtestYtheYloadYsideYofYtheYcircuit.YTechYBYsaysYthatYfuseY17Ysen
dsYpowerYtoYtheYACYcompressorYclutchYrelay.YWhoYisYright?Y-YCORRECTYANSWERY-AYonly
WITH CORRECT ANSWERS 2025
WhatYwouldYbeYtheYmostYlikelyYresultYofYaYmissingYACYcompressorYclutchYdiode?Y-YCORRECTYANSWERY-
DamageYtoYtheYECM
TechYAYsaysYthatYtheYserviceYfittingsYforYR-134aYareYtheYsameYasYtheYserviceYfittingsYforYR-
12.YTechYBYsaysYtheYlow-sideYserviceYfittingYisYaY16mmYquick-connectYandYhigh-sideYisY13mmYquick-
connect.YWhoYisYright?Y-YCORRECTYANSWERY-Neither
AnYinoperativeYcable-
controlledYheaterYcontrolYvalveYisYbeingYdiagnosed.YTheYcontrolYmovesYfreely,YbutYtheYvalveYdoesYnotYresp
ond.YTechYAYsaysYtheYcableYhousingYclampYmayYbeYlooseYatYtheYpanelYend.YTechYBYsaysYtheYcableYmayYbeYru
stedYinYtheYhousing.YWhoYisYright?Y-YCORRECTYANSWERY-AYonly
TechYAYsaysYthatYtheYscanYtoolYreceivesYdataYfromYtheYvehicleYbyYcommunicatingYonYtheYdataYbusYnetwork.
YTechYBYsaysYthatYifYoneYofYtheYtwoYdataYbusYwiresYbecomesYbroken,YthenYtheYnetworkYstillYcommunicatesY
onYtheYremainingYgoodYwireYbutYwillYsetYaYtroubleYcode.YWhoYisYright?Y-YCORRECTYANSWERY-Both
TheYtoolYinYtheYfigureYaboveYisYusedYtoYremoveYandYinstallYwhichYACYcomponent?Y-YCORRECTYANSWERY-
TheYOrificeYtube
ReferringYtoYtheYfigureYabove,YtheYblendYdoorYgetsYjammedYinYtheYmiddleYofYtheYtravelYarea.YWhatYisYtheYm
ostYlikelyYsystemYfault?Y-YCORRECTYANSWERY-TheYHVACYairYtempYcouldYnotYbeYregulated.
WhichYACYrelatedYprocedureYwouldYtheYaboveYtoolYbeYusedYfor?Y-YCORRECTYANSWERY-
TestingYtheYrefrigerantYforYimpurities.
ReferringYtoYtheYfigureYabove,YwhatYwouldYtheYHVACYmalfunctionYifYtheYcomponentYbecameYrestricted?Y-
YCORRECTYANSWERY-LowYairflowYfromYtheYducts.
ReferringYtoYtheYfigureYabove,YtheYACYcompressorYclutchYwillYnotYengage.YTechYAYsaysYthatYtheYACYclutchYre
layYcouldYbeYbypassedYwithYaYfusedYjumperYtoYtestYtheYloadYsideYofYtheYcircuit.YTechYBYsaysYthatYfuseY17Ysen
dsYpowerYtoYtheYACYcompressorYclutchYrelay.YWhoYisYright?Y-YCORRECTYANSWERY-AYonly
