Practice question
A school bus A/C system shows frost forming on the liquid line just after the orifice tube and poor cooling. This most likely indicates:
- A failed compressor clutch coil
- A normal condition at low ambient
- A restriction at the orifice tube screen
- An overcharged system
Answer: C — A restriction at the orifice tube screen
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Practice more: ASE S7 Air Conditioning Systems & Controls (School Bus) Practice Questions - ASE S7 - Air Conditioning Systems & Controls (School Bus) Certification Exam →