ASE A1 Engine RepairLubrication and Cooling SystemsEasy
During a cooling system pressure test, the system holds pressure for several minutes, but the technician notices a sweet odor and a small puddle forming under the vehicle, specifically near the front of the engine block. The water pump was recently replaced. What is the most likely source of the leak?
- AA pinhole leak in the radiator core
- BA cracked heater hose
- CA loose or damaged water pump gasket/seal
- DA leaking radiator hose
Show answer & explanationAnswer & explanation
Correct answer: C. A loose or damaged water pump gasket/seal
Given that the water pump was recently replaced and a leak is observed specifically near the front of the engine block where the pump is located, a loose or damaged water pump gasket or seal is the most probable cause. The sweet odor confirms it's coolant.
Why the other options are wrong
- A. A pinhole leak in the radiator core would cause a leak directly from the radiator, not specifically from the engine block area.
- B. A cracked heater hose would typically leak from the firewall area or closer to the heater core, not the front of the engine block.
- D. A leaking radiator hose would typically be visible connecting the radiator, not necessarily directly under the front of the engine block.
Water Pump Leaks
Water pump leaks are common, especially after replacement, and often result from improper installation of the gasket or seal, leading to coolant loss from the front of the engine.
- Coolant leak from front of engine
- Often related to recent water pump service
- Sweet odor of coolant
Memory trick: Front leak, sweet smell? Pump's seal didn't fare well!