Question about Nissan Sentra

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I have a 05 Nissan Sentra and it keeps running hot and the heat isn't blowing hot. But when Im under the hood the hoses runing from the radiator and thermastat; the top hose gets really hot while the bottom one stays cool.

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Hey iisha, although obvious, 1st thing to check is the coolant level. If it's low, the engine will run hot and the low level prevents coolant from circulating to the heater core inside the car, so the result is little or no heat, but engine running hot situation. The top rad. hose takes hot coolant from the engine, it flows down thru the radiator where it is cooled (w/ help from the fan) and the coolant returns to the engine at a reduced temp. to keep the temp under control, and it's returned thru the bottom hose (the result is the bottom hose should be cooler thant the top. There's more involved than that, so 1st check your coolant level, if it's ok let me know I'll help further. Hopefully the fix is that simple, and it is a rather common problem.

Posted on Dec 08, 2008

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