320I BMW Upper Hose Model 17127596837

Normal temperature difference and abnormal judgment

Reasonable temperature difference range

Upper water pipe 17127519255: Normal working temperature is about 80-100℃ (connecting the engine to the top of water tank);

Lower water pipe 17127519248: Temperature is about 70-90℃ (connecting the bottom of water tank to the engine) Temperature difference standard: 5-10℃ is normal, if more than 20℃, urgent maintenance is required.

Temperature difference is too large cause

Thermostat stagnation: resulting in the coolant can not enter the large cycle, manifested as the upper water pipe 17123415433 hot hand lower water pipe 11537500733 cool (most obvious when starting a cold car);

water pump failure : coolant circulation is interrupted, common in electronic water pump models (need special equipment exhaust);

radiator clogging: affect the cooling efficiency, exacerbate the temperature difference

Highly aging parts

Upper water pipe 17127537745: long-term high temperature baking easy to yellow and become brittle, B48 engine models about 3-5 years must be aging;

back to the water pipe / turbine water pipe: joints made of rubber wood is easy to crack, B48 engine "anchors one of the three sets (with the oil compartment base called the mid-cylinder joints) B48 engine "anchor three-piece set" (with the oil compartment base, mid-cylinder connector);

secondary kettle connecting tube: hard plastic joints are easy to break, the risk of liquid leakage is high.

Warning Signs of Aging

Surface cracked like bark, or leaking blue/pink coolant crystals;

Water hose fittings yellowed and deformed, white water stains at clamps.

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