Water tank down pipe is not hot what is going on.
The thermostat is faulty or stuck
The main reason why the water tank water pipe is not hot is that the thermostat is faulty or stuck.
When the thermostat fails or is stuck, even if the engine water temperature reaches the preset target, the thermostat switch may not be able to open smoothly, so as to maintain the closed state. In this case, the coolant completes the cycle heat dissipation process inside the engine, and the thermostat is a key component that controls this cycle path. In normal operation, the cooling system adopts a small circulation mode, during which the thermostat remains closed, so the downpipe does not rise significantly. If the thermostat is damaged or stuck, the cooling system cannot be circulated, and the cooling water cannot flow through the lower pipe for heat dissipation, resulting in the phenomenon of the upper pipe being hot and the lower pipe being cool. In addition, the failure of the pump, the blockage of the upper and lower water pipes or the blockage of the water tank may also lead to poor coolant circulation, which will affect the problem of the lower water pipe is not hot.
To solve this problem, it is usually necessary to replace the thermostat to restore the large circulation function of the cooling system and ensure that the coolant can flow smoothly through the downpipe for heat dissipation. At the same time, checking and repairing other problems that may cause poor coolant circulation, such as pump failure, pipe blockage, etc., is also a necessary step.
Car water tank water pipe leakage how to repair
Car water tank water pipe leakage can be repaired by the following methods:
Use tank strong plugging agent: If the leak does not exceed 1mm cracks or 2mm holes, you can add a bottle of tank strong plugging agent to the tank, and then start the car to run. The sealant automatically finds and fixes leaks.
Cut and block the leaking heat pipe: If the water tank heat pipe leaks and is serious, you can cut the leaking heat pipe from the water leakage, use soapy cotton ball to block the cut heat pipe, and then use pliers to clip the cut head of the heat pipe, and then roll the edge tightly to stop the water leakage.
Check and tighten the tank cover: Check that the tank cover is secured. If not, tighten it again to prevent water leakage.
Solder or adhesive repair: For larger water leakage problems, solder or professional adhesive repair can be used. This applies to cracks or minor leaks in the tank. It should be noted that if the leakage is more serious, it is necessary to clean and polish the leaking part first, so as to ensure the repair effect.
Argon arc welding leak repair method: For more complex situations, argon arc welding leak repair method can be used. This method requires grinding and cleaning the leaking part first, and then welding the argon arc welding rod on the leaking part. This method can ensure the repair effect, but it should be noted that if the water leakage is more serious, it is necessary to strengthen and strengthen the water leakage part first.
Inspect and replace damaged parts: If traces of oil emulsification are found, the engine cylinder pad needs to be replaced. This usually involves disassembling the engine for repairs.
Add gas to check the leak area: Add gas to the tank, because the pressure leakage area will leak water, so that the gap is found to repair.
Through the above methods, most of the car water tank water pipe leakage problems can be effectively solved. If the problem is complex or cannot be handled by yourself, it is recommended to send the vehicle to a professional repair shop for inspection and repair as soon as possible.
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