HVAC FINAL

–If an excessive amount of bubbles are dissolved in coolant it becomes aerated and reduces its ability to __________ _____________.

• transfer heat
• increase pressure
• improve efficiency
• prevent corrosion

–As coolant heats up, it _______ and must be ____________if it leaves the pressurized part of the cooling system.

• expands, captured

• contracts, released

• contracts, captured

• expands, released

When coolant cools down, it contracts and is drawn back in the _____________ ________________.

• exhaust pipe
• fuel tank
• engine block
• cooling system

_____________ ___________ in contact with coolant causes a chemical reaction, leads to corrosion.

• Dissimilar Plastic coming in contact with coolant

• Dissimilar Rubber coming in contact with coolant

• Dissimilar Glass coming in contact with coolant

• Dissimilar Metals coming in contact with coolant

Coolant additives must minimize ________________.

• corrosion

• pressure

• color retention
• fuel efficiency

A 0.06” layer of scale will reduce heat transfer by________%.

• 40%

• 10%
• 4%
• 8%

Cooling system is designed to transfer ________. 

• energy
• cold
• sound
• heat

__________ are heat exchanger to transfer heat of coolant to the atmosphere

• Fans
• Heaters
• Radiators
• Thermometers

•Visual Inspection

–A thorough inspection includes checking: _______________ ______________,coolant level, ____________ _______________ leaks, ______________ ___ _____________ .

(Mark all that apply)

• coolant condition,

• white exhaust

• purple smoke

• bubbles in coolant

• congestion of tubes

Which of the following is NOT a common symptom of a failing cooling system?

• Engine overheating

• Frequent coolant leaks

• Reduced gas mileage

• Increased engine noise