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What is the reason why the new thermostat won't open?

2 Answers

Coleman

07/29/25 12:12pm

Reasons why the new thermostat won't open: 1. Internal damage to the thermostat; 2. Damage to the thermostat opening valve; 3. The water temperature is too low. The thermostat is a valve that controls the flow path of the coolant, serving as an automatic temperature-regulating device. It typically contains a temperature-sensing component that uses thermal expansion or contraction to open or close the flow of air, gas, or liquid. The thermostat usually includes a temperature-sensing element that relies on expansion or contraction to open or close the coolant flow, automatically adjusting the amount of water entering the radiator based on the temperature of the coolant. This changes the circulation range of the coolant to regulate the cooling system's heat dissipation capacity. Currently, the most commonly used thermostats are wax-type thermostats, which control the coolant circulation method through the thermal expansion and contraction principle of the internal paraffin wax.

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EmersonMarie

08/13/25 10:33pm

Having played with cars for years, I've encountered quite a few cases where new thermostats fail to open. Most often, it's due to installation errors—like mounting it backward. The thermostat has an arrow mark that should face the coolant flow direction; if installed wrong, it'll definitely get stuck closed. Another possibility is getting a defective unit where internal debris from manufacturing blocks it, causing delayed opening. Additionally, air bubbles trapped in the cooling system can hinder operation—when the engine heats up, these bubbles obstruct fluid flow, preventing the thermostat from opening. The solution is straightforward: First, verify proper installation by checking the arrow direction after removal. If correct, inspect the system for air leaks and bleed it using the vent valve. If all else fails, replace it with a reputable brand—I recommend avoiding cheap options since this component affects engine health. Chronic overheating could damage cylinder blocks, costing thousands in repairs. Address it promptly for safety.

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