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Chapter 21, Problem 2CQ

A customer complains that the heater works sometimes, but sometimes only cold air comes out while driving. Technician A says that the water pump is defective. Technician B says that the cooling system could be low on coolant. Which technician is correct?

  1. a. Technician A only
  2. b. Technician B only
  3. c. Both Technicians A and B
  4. d. Defective pressure cap
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