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What is the reason why the water temperature gauge of Tianjin truck key does not return to position in 1st gear?

2 Answers

Devin

07/28/25 8:57pm

The reasons why the water temperature gauge of Tianjin truck key does not return to position in 1st gear are as follows: Possible causes: It may be due to a broken power line of the water temperature gauge, burnt heating coil of the water temperature gauge, burnt heating coil or poor contact of the water temperature sensor, poor connection or broken wire of the water temperature sensor, or damage to the voltage regulator that supplies stable power to the water temperature gauge circuit. Function of the water temperature gauge: The water temperature gauge indicates the temperature of the coolant, but it also reflects the engine temperature. After all, the coolant is used to cool the engine. Therefore, if the water temperature is too high, the engine cannot operate normally. Conversely, if the water temperature is too low, it can also be a significant factor leading to higher fuel consumption.

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KiraLee

08/12/25 1:40am

Over the past few years, I've encountered numerous issues with the temperature gauge while repairing vehicles. For the Tianjin truck, when the key is turned to the first position, the temperature gauge doesn't move. This is mostly due to a faulty temperature sensor or wiring issues. When the sensor ages or gets clogged with dirt, it responds sluggishly, failing to transmit signals to the gauge. Alternatively, poor contact at the connector or loosening due to bumps can be the cause. Sometimes, aging vehicle wiring with damaged insulation can short-circuit, causing unstable current that affects the gauge's return to zero. The inspection steps aren't complicated: first, check if the sensor connector is secure, then test the ground wire for rust; next, start the engine and observe if the gauge returns to normal—it should quickly reset to zero. If it still doesn't work, the issue might be mechanical jamming inside the gauge, requiring disassembly for lubrication or replacement. Low voltage can also affect it, so check the battery level. Don't underestimate this issue; inaccurate temperature readings can lead to misjudging engine overheating, significantly increasing the risk of engine seizure. It's best to visit a professional repair shop as soon as possible for a thorough fix.

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