Cooling System: Service and Repair

COOLANT LEAK CHECK





1. Loosen the radiator cap.
2. Confirm that the coolant level is up to the filter neck.
3. Install a radiator camp tester to the radiator filter neck and apply 150 kPa (21 psi, 1.53 kg/cm2) pressure. Hold for two minutes in that condition, while checking for leakage from the radiator,hoses or connections.

Caution:
1) Radiator coolant may be extremely hot. Do not open the system while hot, or scalding water could spray out causing personal injury. Allow vehicle to cool before servicing this system.
2) Be sure to completely clean away any moisture from the places checked
3) When the tester is removed, be careful not to spill any cooant from it.
4) Be careful, when installing and removing the tester and when testing, not to deform the filler neck of the radiator.

4. If there is leakage, repair or replace the appropriate part.


SPECIFIC GRAVITY TEST





1. Measure the specific gravity of the coolant with a hydrometer.
2. Measure the coolant temperature, and calculate the concentration from the relation between the specific gravity and temperature. Use the following table for reference.

NOTE: The following table is applicable only to the specified high quality ethylene glycol (antifreeze) coolant.





Relation between coolant concentration and specific gravity


The safe operating temperature is -15°C (5°F) when the measured specific gravity is 1.058 at coolant temperature of 20°C (68°F)

CAUTION: If the concentration of the coolant is below 30%, the anticorrosion property will be adversely affected. In addition, if the concentration is above 60%, both the anti-freeze and engine cooling properties will decrease, adversely affecting the engine. For these reasons, be sure to maintain the concentration level within the specified range. Do not mix brands of coolant.