4) Explain water pump and radiator maintenance.OR

Write down short note on radiator and water pump maintenance.OR

Explain radiator maintenance and procedure.

Ans:-

See page no. 256

(26-16 Locating and repairing radiator leaks

26-17 Water pump service)

Radiator maintenance

The following tips will help you to maintain your radiator well.

Top up the coolant

Ensure that the coolant is always at the correct level. If there are some air bubbles in the cooling system, then the coolant will not circulate effectively. Let the engine cool down completely before checking the coolant level and topping up as necessary. Make sure that you top up with the same type of coolant. Consult your mechanic if you are not sure.

Check for any clogs or leakage

The coolant may leak at either the hoses or cap. Check these places and make any necessary repairs or replacements. You can determine cold spots due to clogging by carrying out an infrared scan. Depending on its condition, you may either need to replace the radiator or simply clean it well. Please note that flushing just removes mineral deposits and rust but does not clear the clogs.

During winter

Under normal circumstances, you should mix equal parts of antifreeze and water. However, the antifreeze should be about 60% during cold temperatures.

What Type of Radiator Fluid Should You Use?

There are so many kinds of radiator fluids that you may be wondering what you should use and what you need to avoid. Just a casual glance at an auto supply store will reveal the variety to you. If you would like to know the best type of radiator fluid for your vehicle, you should determine the general climatic conditions in

which you drive and then consult the car's manual. Your mechanic will also give you relevant guidance.

The right radiator fluid

Glycol-based coolants work well for most automobiles, which is usually mixed with equal parts of water. The 50/50% ratio works well for many types of climates. However, you will need to use relatively more antifreeze if you live in a colder climate. In such a place, you can mix 70% coolant with 30% water so that the engine does not freeze because of the cold temperatures.

Incorrect radiator fluid

There are many cheap brands of radiator fluid that you should not use. These types of radiator fluids cannot withstand the demands that your vehicle is likely to place on them. You should preferably stick with reputable brand names. The slightly higher cost will actually save you more in the long run.

Or

Radiator repair procedure

Steps

1. 1

Consider the parts you will need for this job and make a list . Depending on how thorough you would like to be and/or your budget, this list can vary. The main shopping list contains the radiator and coolant. As necessary you may need hoses, hose clamps, various nuts and bolts, or a thermostat.

2. 2

Take a look at the hoses and connections to and from the radiator. Squeeze the hoses to check for deterioration. If any hoses are swollen near the hose clamps or have soft spots or cracks, replace them. Replace hose clamps if they bind or will not tighten. Replace the thermostat since it's cheap and your draining the coolant already

3. 3

If you feel a crunching sensation when you squeeze the hoses you probably have rust in the cooling system. The system will need to be flushed before filling with new coolant. There are kits to do this at your local auto part store, but if you would rather do it yourself follow this procedure:

o Drain old coolant into appropriate container for disposal.(most radiators have a drain plug on the bottom)

o Locate and remove the thermostat.

o Locate and remove the upper coolant hose.

o Insert garden hose into where upper coolant hose enters engine.

o Turn on hose, run until water exiting system is clear.

o Remove the coolant reservoir and flush it with water.

o Drain all water and re-install thermostat and reservoir.

4. 4

Now that you have your parts and (if necessary) have flushed your cooling system, you are ready to begin! If you haven't already, drain old coolant into appropriate container for disposal (most radiators have a drain plug on the bottom) and remove thermostat.

5. 5

Locate and disconnect all hoses leading to radiator. Use penetrating oil on all hose clamps to avoid breakage/stripping. In some cars, there may be a transmission fluid cooler built into the radiator. If there are hoses running from the radiator from the transmission, be careful to catch the trans fluid that drops when you disconnect those lines (don't reuse that fluid either). Be careful with all fluids as they are very toxic.

6. 6

Locate and disconnect the fan motor electrical connector and any other electrical connectors. Usually it is necessary to remove the fan assembly in

order to remove the radiator. It should be bolted to the radiator directly. Use penetrating oil on bolts to avoid stripping/breakage!

7. 7

Look at your radiator. There should be no hoses, electrical connectors, and it should have sufficient clearance to be removed. If not, study the layout and think before disassembling anything else.

8. 8

If it looks like you are a go, look at how your radiator is attached to your car. Usually there are braces bolted to the frame on top, and the bottom rests on rubber feet within an indentation. Remove the top braces

(Use penetrating oil on bolts to avoid stripping/breakage!) and pull upwards on the radiator. If it comes out, congratulations! If not, don't yank or pry. Study it and find the other bolts.

9. 9

Installation is the reverse of disassemble. Remember not to over tighten hose clamps. Go over everything you took off in your head! If you forget the fan motor connector or a tiny water pump bypass hose you can waste a lot of effort and time.

10.10

When everything has been assembled, refill the cooling system with coolant. To do this remove the cap from the radiator, fill until coolant is visible but a few inches below cap level. Start the engine (Don't rev or accelerate), the coolant level will lower as the engine sucks in coolant, continue to fill with coolant until the level stabilizes then install and tighten the cap. Lastly, fill the coolant reservoir with coolant to the appropriate level. If transmission fluid was spilled, check trans fluid level and add NEW trans fluid if necessary.

11.11

Finished!