Practice question

One rear heater on a school bus is cold while the front heater is hot. Engine is warm and coolant is full. What is the most likely cause?

  1. An airlock, restricted hose, or failed booster pump in the rear heater loop
  2. A blown headlight fuse
  3. A faulty fire extinguisher
  4. A misadjusted stop arm

Answer: A — An airlock, restricted hose, or failed booster pump in the rear heater loop

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: ASE S1 Body Systems & Special Equipment (School Bus) Practice Questions - ASE S1 - Body Systems & Special Equipment (School Bus) Certification Exam →