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heating issues/ blowing cold air when stopped

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Old 01-14-2012, 02:12 PM   #1
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heating issues/ blowing cold air when stopped

a friend of mine has a nissan xterra and the heat is not working properly, When the car is moving the car heats up fine but when she stops at redlight it blows cold air, what could be the issue, bad thermostat or some type of sensor
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Old 01-14-2012, 02:25 PM   #2
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The first thing I'd check is the coolant level. Too low a level might not circulate through the heater at low RPM, but could at higher RPM. There may also be a bleeder somewhere on the top side of the engine that might have to be bleed to purge air in the system. I'm just throwing these ideas out. I have no direct knowledge of Nissans, but have had both these issues with previously owned vehicles that suffered the same problem.
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Old 01-14-2012, 02:28 PM   #3
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Quote:
Originally Posted by LostRebel View Post
The first thing I'd check is the coolant level. Too low a level might not circulate through the heater at low RPM, but could at higher RPM. There may also be a bleeder somewhere on the top side of the engine that might have to be bleed to purge air in the system. I'm just throwing these ideas out. I have no direct knowledge of Nissans, but have had both these issues with previously owned vehicles that suffered the same problem.
I am checking these right now, thank you
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Old 01-14-2012, 11:11 PM   #4
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Tell him to get rid of the Nissan and buy a Toyota and he wont have these kind of problems
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Old 01-14-2012, 11:26 PM   #5
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Low on coolant, clogged heater core, weak water pump. Most likely a clogged heater core. Might try back flushing it.
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Old 01-14-2012, 11:27 PM   #6
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could be a vacuum problem, maybe (big maybe) there is not enough vacuum produced when the engine is idling. most vehicles use vacuum to work the actuator that closes the flap between the heat and cool side of the heater box under the dash (or where ever it is located, usually near the blower motor.) just an idea...
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