TTECH 3202 Engineering Tech

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TTEC 3206 Vehicle Technology

Answer to Robs questions cooling systems.

1. What is the purpose of the water pump
2. How much energy is converted in to mechanical energy
3. What are the three ways of heat transfer
4. What is the purpose of coolant
5. What are the main components of a cooling system
6. Why do we need flexible water hoses on the cooling system
7. Why are coolant hoses reenforced
8. How is the water pump driven
9. What is the water jacket
10. What is the purpose of the thermostat
11. What is the purpose of the cooling fan
12. Why do some cars have two cooling fans
13. On electric cooling fans, what switches the fans on and off
14. How does the temperature gauge work
15. Why do we have a radiator pressure cap
16. Why do we have a recovery bottle
17. What is electrolysis

     1.  The main purpose of A water pump is to circulate the coolant around A water-cooled engine.
     2. A third of the energy is converted.
     3. Conduction transfers heat through solids. Convection transfers heat through liquids and gases.
         Radiation transfers heat through electromagnetic waves.
     4. Keeps the water in your engine from freezing if you had no coolant your engine would more
         than likely seize.
     5. Radiator, Water Pump , Core plugs , Head gasket , Thermostat , Hoses , Fan Clutch ,
         Electric cooling fan , Head Gasket , Timing Cover Gasket.
     6. Because If the hoses were hard then they would just break or snap the engine moves and
         because of this they need to be able to flex and move with the engine.
     7. There is to much pressure that goes on during circulation if they weren't they would split and
          leak.
     8. By the timing belt witch makes the drives belts move witch drives the water pump.
     9. It is a hollow space around certain parts of the engine they are they so water can circulate
         through and cool the engine.
   10. The thermostat releases the coolant to the block at a set temp. so that the engine can run at its
         prime temp.
   11. So the when you are sitting still the fan will turn on and pull the air through the radiator and
          the coolant at the right temp.
   12.  One for drive and one for the A/C.
   13.  A heat sensor tells it or them to turn on and off when either the temp is to high or is at the right
          temp.
   14.  There is an ECT sensor that is on the intake manifold. It works by constantly communicating
          to a computer in your car that tells it how hot or cold your engine is. Can be digits or just a
          plain gauge.
   15. So that if the pressure gets to high it will release some pressure to save multiple components
         from breaking.
   16. So the that there is no wastage of coolant/water and can then be circulated back into the
         coolant system.
   17. This is when a chemical unbalance happens and it actually turns acid witch acts like a battery.
         It can be extremely destructive to your engine components.

Ten step Compression test.

 1. Start your vehicle as usual and keep the engine running for a few minutes. This should warm up the engine to its normal operating temperature.

2. Switch off the engine completely before beginning the test.

3. Remove electrical connection from the ignition coil. This will insure no spark could accidently start the engine when preforming the test.

4. Hold down the acceleration peddle all the way down. This will disable the injectors or remove the fuel dump relay altogether.

5. Take out the spark plugs and disconnect the wires for each spark plug.

6. Put the engine compression gauge into the first cylinder's spark plug hole (this is the hole that is nearest to the drive belt).

7. Ask a helper to start the engine. Five revolutions of the engine is enough.

8. Get a not pad or something to write down your results.

9. Do the test for all Cylinders.

10. Compare the average % of difference in your number values If they are not roughly all the same something is wrong.