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Could be,

low on coolant (a leak in the system),

a stuck closed thermostat,

a faulty temp gauge sending unit,

a bad head gasket or cracked head (worst case scenario).

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9y ago
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9y ago

Stuck open thermostat.

Defective temp sending unit.

Broken/disconnected wire or connection.

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10y ago

Could have a stuck closed thermostat.

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Q: Why does the temp gauge stay in the hot position?
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