Cooling System [2.3L]: Diagnosis Mazda Tribute I рестайлинг

Inspection and Verification

1. Verify the customer concern by operating the engine to duplicate the condition.
2. Inspect to determine if any of the following mechanical or electrical concerns apply. VISUAL INSPECTION CHART Mechanical Electrical Leaks Restricted airflow through the condenser/radiator Damaged hoses Loose/damaged hose clamps Damaged coolant gasket Damaged head gaskets Damaged intake manifold gasket Damaged coolant pump Damaged radiator Damaged degas bottle Damaged heater core Damaged Engine coolant Temperature (ECT) sensor Damaged wiring Damaged or obstructed electric cooling fan/shroud
3. If the inspection reveals an obvious concern that can be readily identified, repair it as necessary.
4. Inspect the coolant condition. Inspect the coolant color. If Mazda Premium Engine Coolant or equivalent meeting Mazda specifications (yellow color) has a clear or pale yellow color, this indicates a higher water content than required. Dark brown could indicate unauthorized stop leak may have been used. Use Cooling System Stop Leak Pellets meeting Mazda specifications. A light or reddish brown color indicates that rust may be present in the cooling system. Flush the system and refill with the correct mixture of water and Mazda Premium Engine Coolant. An iridescent sheen on the surface of the coolant could indicate a trace of oil is entering the system. See «ENGINE INSPECTION»(/mazda/tribute/i-2004-2007/remont/testing-diagnostics/#symptom-troubleshooting-engine-controls) . A milky brown color may indicate that engine oil is entering the cooling system. If oil is suspected, the cause of the leak may be internal to the engine. For additional information on engine diagnosis, See «ENGINE INSPECTION»(/mazda/tribute/i-2004-2007/remont/testing-diagnostics/#symptom-troubleshooting-engine-controls) . A milky brown color in the engine oil may indicate that coolant is entering the oil. If coolant is suspected, the cause of the leak may be internal to the engine. For additional information on engine diagnosis, see «ENGINE INSPECTION»(/mazda/tribute/i-2004-2007/remont/testing-diagnostics/#symptom-troubleshooting-engine-controls) . If the engine coolant appearance is acceptable, test the engine coolant freezing point range with the Battery/Antifreeze tester. The freezing point should be in the range of -45° C (-49° F) to 23° C (-10° F). If the vehicle is driven in cold climates less than -37° C (-34° F), it may be necessary to increase the coolant concentration to get adequate freeze protection. Maximum coolant concentration is 60/40. Minimum coolant concentration is 40/60. Adjust coolant range and level if necessary: If the coolant is low, add specified coolant mixture only. If the coolant tests weak, add straight engine coolant until the readings are within acceptable levels. If the coolant tests strong, remove some of the engine coolant and add water until the readings are within acceptable levels.
5. Verify the cooling system is correctly filled and bled. See «COOLING SYSTEM DRAINING, FILLING AND BLEEDING»(ref-221820-S21265484122006022600000).
6. If the concern remains after the inspection, determine the symptom(s) and go to the Troubleshooting Index.

Pressure Test

1. Turn the engine off. WARNING: To avoid personal injury, do not unscrew the coolant pressure relief cap while the engine is operating or hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly.
2. Check the engine coolant level.
3. Connect the Radiator/Heater Core Pressure Tester to the degas bottle nipple and overflow hose. Install a pressure test pump to the quick-connect fitting of the test adapter. NOTE: If the plunger of the pump is depressed too fast, an erroneous pressure reading will result.
4. Slowly depress the plunger of the pressure test pump until the pressure gauge reading stops increasing and note the highest pressure reading obtained.
5. If the pressure relief cap does not hold pressure, remove and wash the pressure relief cap in clean water to dislodge all foreign particles from the gaskets. Check the sealing surface in the filler neck.
6. If 8-9 kPa (13 psi) cannot be reached, install a new pressure relief cap. If more than 12 kPa (18 psi) shows on gauge, install a new pressure relief cap. NOTE: If the pressure drops, check for leaks at the engine to heater core hoses, engine-to-radiator hoses, water valve hose (if applicable), oil cooler return tube gasket, radiator and heater core or other system components and connections. Any leaks which are found must be corrected and the system rechecked.
7. Pressurize the engine cooling system as described in Step 4 (using a pressure relief cap that operates within the specified upper and lower pressure limits). Observe the gauge reading for approximately two minutes. Pressure should not drop during this time.
8. Release the system pressure by loosening the pressure relief cap. Check the engine coolant level and replenish, if necessary, with the correct engine coolant mixture. See «COOLING SYSTEM DRAINING, FILLING AND BLEEDING»(ref-221820-S21265484122006022600000).

Radiator Leak Test, Removed From the Vehicle

Note. Always install plugs in the oil cooler fittings before leak-testing or cleaning any radiator.

Note. Clean the radiator before leak-testing to avoid contamination of tank.

1. Leak-test the radiator in clean water with 138 kPa (20 psi) air pressure.

See also:
• ENGINE INSPECTION