Question about 2001 Nissan Sentra

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Overheating no heater

I have a 2001 Nissan Sentra GXE, the other night my car overheated and when I pulled over I realized the radiator was empty (the reserve tank was over Max) I put more radiator fluid into the radiator and made it the rest of the way home. For two days nothing happened, A/C was on and off, and I traveled both short and long distances. Then it began to overheat on the highway, I pulled over and had to get off the highway. When I looked the radiator was not completely empty, but did need more fluid I added more and made it home ok. I have checked each day before leaving for work and coming home. This morning I added a little bit of fluid it didn't need that much, but when I got to work (about 6miles) I put in fluid and it kept going down each time I filled it, it took about 5 tries to get it to stop. Also, my heat is freezing when I try to turn on the heater to draw the heat off the engine the air coming out is air conditioner cold. Both of my fans are working, I'm not sure what the problem is. I have been told that I blew a head gasket, but the symptoms do not match what I have seen and read on that. It more like a thermostat issue, but now with the heater now working I'm concerned. Any advise on this would be great!

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Sounds like a sticky thermostat. That would prevent coolant from circulating through the radiator and heater box. Your engine would overheat while the heater blows cold air.

Replace the thermostat and thermostat gasket; it's a cheap fix you can probably handle yourself.

Good luck !


Posted on Jun 17, 2009

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When was the last time the coolant thermostat was changed out? if you cant remember than definite change that part out now.
I would replace the radiator cap also.
the thermostat may or may not have failed.
in conjunction sounds like the radiator cap is failed allowing coolant to escape to the reservoir but the cap isnt allowing the siphoning of the coolant back into the radiator as the coolant cools.
if you have overheated the car and did not catch it in time then you may have warped the head which will be a costly repair.
I hope this helps... If I have helped solve this please return and rank this answer. thanks!

Posted on Jun 17, 2009

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First thing make sure that oil is not mixing with your radiator coolant. That would tell you if you had a blown head gasket. The coolant has to be going somewhere and it sounds like it's leaking. Possibly from the heater control valve, since you mentioned no heat. It's very easy to not even notice it. Check the passenger side front floor mat and make sure it's not soaking wet. If it is wet then it's a bad heater control valve. Check the thermostat by removing it and heating up some water to hotter than the temp that's on the thermostat and see if it opens properly. Finally if all else fails, get the car up to normal operating temp, turn on the heater full blast and check both the hoses going into and out of the heater control valve. They should both be hot. Hope this was a little help. Good luck!

Posted on Jun 17, 2009

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