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2005 Nissan Sentra No Heat
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littlerednissan
Novice
Nov 21, 2011, 5:04 PM
Post #1 of 10
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2005 Nissan Sentra No Heat
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The heat in my 2005 Nissan Sentra is only working intermittedly. The radiator was hot on one side, but cold on the other, so we thought the radiator was clogged so we replaced the radiator and cap (which I think was leaking) and the thermostat. However the radiator is still cold on one side and the heater hoses are cold. When I start driving the heat comes on occasionally.
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 21, 2011, 5:13 PM
Post #2 of 10
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Re: 2005 Nissan Sentra No Heat
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Which engine? Is it overheating?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 21, 2011, 5:16 PM)
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littlerednissan
Novice
Nov 21, 2011, 5:36 PM
Post #3 of 10
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Re: 2005 Nissan Sentra No Heat
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Nissan Sentra 1.8S
The engine was running hot when I was stopped at lights, but would cool when I started to drive. Since we replaced the radiator it hasn't been running hot.
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 21, 2011, 5:40 PM
Post #4 of 10
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Re: 2005 Nissan Sentra No Heat
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The upper radiator hose is hot, but the lower radiator hose is cold? How did the old radiator look inside? Was it really crusty or plugged?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 21, 2011, 5:41 PM)
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Sidom
Veteran
/ Moderator
Nov 21, 2011, 7:07 PM
Post #5 of 10
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Re: 2005 Nissan Sentra No Heat
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Have you made sure the cooling fans are coming on after the engine heats up?
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littlerednissan
Novice
Nov 21, 2011, 7:58 PM
Post #6 of 10
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Re: 2005 Nissan Sentra No Heat
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The hoses going into and out of the radiator are hot, but the hoses going from the engine into the car are not. I just drove it for about 20 minutes and the heat never came on. I parked for about 15 minutes while I ran into the store and when I fired it up the heat came on, though the air was not as warm at the red lights as when I was actually driving.
The old radiator looked fine, not crusty or plugged from what I could tell, but we are pretty sure it had a leak because it was almost empty and you could smell antifreeze when the car was running, both inside the car (through the vents) and if you were standing over the engine while it was running.
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littlerednissan
Novice
Nov 21, 2011, 7:59 PM
Post #7 of 10
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Re: 2005 Nissan Sentra No Heat
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The cooling fans are coming on.
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littlerednissan
Novice
Nov 21, 2011, 8:02 PM
Post #8 of 10
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Re: 2005 Nissan Sentra No Heat
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We realized after we posted the initial post, that the radiator is not actually cool on one side, he was actually feeling the ac condenser in front of the radiator and that is what felt cold.
We are still having the issue where the hoses into the radiator are hot, but the ones going into the car are not.
Just drove the car for about 30 minutes and the temp gauge never went above the half way point
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Sidom
Veteran
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Nov 21, 2011, 8:53 PM
Post #9 of 10
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Re: 2005 Nissan Sentra No Heat
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If both heater hoses are cool/warm to the touch, then there is a flow problem going into the heater core. Either core is plugged up or there isn't good flow going into it....
You could try taking heater hose off & flushing it out with garden hose.
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littlerednissan
Novice
Nov 21, 2011, 9:04 PM
Post #10 of 10
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Re: 2005 Nissan Sentra No Heat
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Forgot to mention - One of the heater hoses is definitely warmer than the other and when the heat is working it is warmer on the passenger side than the drivers side. In fact, sometimes the passenger side blows hot air and the drivers side is downright cold. Will try flushing them with a hose, thanks for the suggestion!
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