202D - Cooling Flashcards

1
Q

What are the two glycol based antifreezes used in modern vehicles?

A
  • Ethylene glycol
  • Propylene glycol

202da pg. 11

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2
Q

Is ethylene glycol or propylene glycol more toxic?

A

Ethylene glycol

202da pg. 11

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3
Q

At what temperature range will a 180F thermostat begin to open?

A

178F - 182F

Begins to open within 1C (2F) of the indicated (plus or minus 1C or 2F)

202db pg. 12

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4
Q

What percentage of combustion heat is removed by the cooling system?

A

Approximately 33%

202da pg. 2

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5
Q

A 1psi increase in pressure will raise the boiling point of water how much?

A

3F

1 psi increase = 3F increase boiling point
6.92kPa increase = 1.66C increase boiling point

202da pg.5

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6
Q

What is used to increase the efficiency at which an engine fan moves air past the radiator?

A

Fan shroud

202da pg. 23

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7
Q

What type are the majority of engine water pumps?

A

Non-positive displacement centrifugal

202da pg. 30

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8
Q

What two things are engine fan clutches designed to reduce?

A
  • Horsepower loss
  • Fuel consumption

202da pg.24

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9
Q

When is coolant drawn into the engine cooling system from the recovery tank?

A

When the engine cools down

202da pg.19

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10
Q

A water manometer can be used to check what two areas of a running engine?

A
  • Inlet restriction: After air cleaner & before turbo
  • Blow-by
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11
Q

What two valves are located in a radiator cap?

A
  • Pressure valve
  • Vacuum valve

202db pg. 7

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12
Q

What is a full blocking thermostat?

A

Thermostat that allows no coolant to flow through to the radiator when the coolant is cold. Allows for faster engine warm-up time.

202da pg. 20

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13
Q

What is a partial blocking thermostat?

A

Thermostat that allows up to 10% of the cold coolant to flow through to the radiator.

202da pg. 20

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14
Q

What are SCA’s?

A

Supplemental Coolant Additives

Corrosion inhibitors that can be added in after a coolant analysis to increase protection or replenish the original inhibitors.

202da pg. 13

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