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Why is top radiator hose hot and the bottom hose cold in 1989 Toyota pickup?
Wiki User
∙ 8y ago
Engines return hot coolant to the radiator through top hose, and cooled coolant goes back to the engine through the bottom hose, so a difference in temperature between the two would not be unusual. Assuming you have allowed the engine to come up to temperature and the bottom hose is stone cold, either the radiator or bottom hose is blocked, the water pump has failed or there is an air lock. A seized viscous coupling on a cooling fan or a permanently running electric fan can also make the radiator over-cool, but the bottom hose would feel slightly cooler than the top hose, not cold.
Wiki User
∙ 8y ago
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