Thursday, March 29, 2012

Toyota Heater & Radiator Hoses Replacing,Testing and Inspecting details?

The details mentioned here are similar for Toyota Celica, Corolla, ECHO & MR2 Car Models.

Its complete procedure for radiator upper and lower hoses as well as heater system Hoses.
The details are mentioned in Parts so go through each part for complete Understanding.
Hoses related details are as follows:----


  1. Draining the cooling system is always done with the engine COLD .
  2. Remove the reservoir tank cap.


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Fig. Remove the coolant reservoir cap ...
  1. Remove the engine under covers.
  2. Position the drain pan under the draincock on the bottom of the radiator. Loosen the radiator and engine drain cocks. These should be opened to aid in draining the cooling system completely. If for some reason the radiator draincock can't be used, you can loosen and remove the lower radiator hose at its joint to the radiator.


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Fig. Radiator and engine draincock locations-7A-FE engine


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Fig. Radiator and engine draincock locations-5S-FE engine


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Fig. The draincock can be loosened by hand

CAUTION
NEVER drain coolant directly onto the ground. When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.



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Fig. Notice the coolant mixture will flow straight out of the hose
  1. When the system stops draining, close both drain cocks as necessary.
  2. Using a funnel if necessary, fill the reservoir tank with a 50/50 solution of antifreeze and water. Allow time for the fluid to run through the hoses and into the engine.


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Fig. Fill the cooling system through the radiator


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Fig. Using a funnel, top off the engine cooling system
  1. Start the engine and let it idle about 10 minuets; add the coolant/water mixture up to the FULL level.


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Fig. Always inspect the radiator cap gasket for deterioration
  1. Install and secure the engine under covers.
  2. Securely tighten the cap.
  3. Race the engine 2000-3000 rpms for about 5 minutes, then stop the engine.
  4. After the coolant drops, remove the cap and add coolant to the FULL level again.
Proceed with draining the system as outlined above. When the system has drained, reconnect any hoses close to the radiator draincock. Move the temperature control for the heater to its hottest position; this allows the heater core to be flushed as well. Using a garden hose or bucket, fill the reservoir and allow the water to run out the engine drain cock. Continue until the water runs clear. Be sure to clean the expansion tank as well.
If the system is badly contaminated with rust or scale, you can use a commercial flushing solution to clean it out. Follow the manufacturer's instructions. Some causes of rust are air in the system, failure to change the coolant regularly, use of excessively hard or soft water, and/or failure to use the correct mix of antifreeze and water.
After the system has been flushed, continue with the refill procedures outlined above. Check the condition of the radiator cap and its gasket, replacing the radiator cap as necessary.


Inspection Of Hoses is as follows:---


Upper and lower radiator hoses along with the heater hoses should be checked for deterioration, leaks and loose hose clamps at least every 15,000 miles (48,000 km). It is also wise to check the hoses periodically in early spring and at the beginning of the fall or winter when you are performing other maintenance. A quick visual inspection could discover a weakened hose which might have left you stranded if it had remained unprepared.
Whenever you are checking the hoses, make sure the engine and cooling system are cold. Visually inspect for cracking, rotting or collapsed hoses, and replace as necessary. Run your hand along the length of the hose. If a weak or swollen spot is noted when squeezing the hose wall, the hose should be replaced.


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Fig. The cracks developing along this hose are a result of age-related hardening


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Fig. A hose clamp that is too tight can cause older hoses to separate and tear on either side of the clamp


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Fig. A soft spongy hose (identifiable by the swollen section) will eventually burst and should be replaced


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Fig. Hoses are likely to deteriorate from the inside if the cooling system is not periodically flushed






Removal & Installation Procedure for Hoses is as follows:---


  1. Remove the radiator pressure cap.

CAUTION
NEVER remove the pressure cap while the engine is running, or personal injury from scalding hot coolant or steam may result. If possible, wait until the engine has cooled to remove the pressure cap. If this is not possible, wrap a thick cloth around the pressure cap and turn it slowly to the stop. Step back while the pressure is released from the cooling system. When you are sure all the pressure has been released, use the cloth to turn and remove the cap.

  1. Position a clean container under the radiator and/or engine draincock or plug, then open the drain and allow the cooling system to drain to an appropriate level. For some upper hoses, only a little coolant must be drained. To remove hoses positioned lower on the engine, such as a lower radiator hose, the entire cooling system must be emptied.

CAUTION
NEVER drain coolant directly onto the ground! When draining coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant may be reused unless it is contaminated or several years old.

  1. Loosen the hose clamps at each end of the hose requiring replacement. Clamps are usually either of the spring tension type (which require pliers to squeeze the tabs and loosen) or of the screw tension type (which require screw or hex drivers to loosen). Pull the clamps back on the hose away from the connection.


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Fig. Grasp the hose clamp. squeeze tightly and pull back
  1. Twist, pull and slide the hose off the fitting, taking care NOT to damage the neck of the component from which the hose is being removed.
If the hose is stuck at the connection, do NOT try to insert a screwdriver or other sharp tool under the hose end in an effort to free it, as the connection and/or hose may become damaged. Heater connections especially may be easily damaged by such a procedure. If the hose is to be replaced, use a single-edged razor blade to make a slice along the portion of the hose which is stuck on the connection, perpendicular to the end of the hose. Do NOT cut deep so as to prevent damaging the connection. The hose can then be peeled from the connection and discarded.
  1. Clean both hose mounting connections. Inspect the condition of the hose clamps and replace them, if necessary.
To install:
  1. Dip the ends of the new hose into clean engine coolant to ease installation.
  2. Slide the clamps over the replacement hose, then slide the hose ends over the connections into position.
  3. Position and secure the clamps at least 1 / 4 inch (6.35mm) from the ends of the hose. Make sure they are located beyond the raised bead of the connector.
  4. Close the radiator or engine drains and properly refill the cooling system with the clean drained engine coolant or a suitable mixture of ethylene glycol coolant and water.
  5. If available, install a pressure tester and check for leaks. If a pressure tester is not available, run the engine until normal operating temperature is reached (allowing the system to naturally pressurize), then check for leaks.

CAUTION
If you are checking for leaks with the system at normal operating temperature, BE EXTREMELY CAREFUL NOT to touch any moving or hot engine parts. Once temperature has been reached, shut the engine OFF, and check for leaks around the hose fittings and connections which were removed earlier.


These details will help.
Thanks.

FOR MORE HELP GO TO: ---

Car repair guide?

http://technoanswers.blogspot.in/2012/03/car-repair-guide.html



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