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2000 maxima overheating
Please any suggestions helps.... My car overheats there is coolant in the radiator and in the reservoir.... I changed the thermostat that's on the same side as the alternator... The car temp gauge goes up as I drive sometimes it goes up then goes back down to the mid point... The fan on the passenger side comes on but not on driver side... Please help
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Originally Posted by rjbrown87
(Post 8955907)
Please any suggestions helps.... My car overheats there is coolant in the radiator and in the reservoir.... I changed the thermostat that's on the same side as the alternator... The car temp gauge goes up as I drive sometimes it goes up then goes back down to the mid point... The fan on the passenger side comes on but not on driver side... Please help
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There are no leaks... Are both fans suppose to come on someone told me one was for the radiator the other fan for a/c
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Originally Posted by rjbrown87
(Post 8955911)
There are no leaks... Are both fans suppose to come on someone told me one was for the radiator the other fan for a/c
They told you wrong ,I hope it wasn't a nissan tech after you payed $100+ for them to look at it ...you should change the fans and see if it still overheats... :mardi: |
if the fan on one side is not coming on, possibly a blow relay, since there's two relay for it, for Fan 1 and Fan 2, whenever you turn on the a/c both fan should kick in, but if one not coming on. possibly the motor is burn out, you can replace the motor, but you can test see if the motor is out, is by simply unplugging the harness, and if you have two alligator wire clip and clip on the the plug on the fan from your 12v battery and see if it comes on, if it doesn't then the motor is out.
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It could be a thermostat issue... but obviously, test/check the fan connections and motors to verify they are working.
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Both fans should come on, and thats probably the issue. On the other hand, you might also have gotten some air in the system while replacing the t-stat. Try bleeding the air out.
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My car used to do the same thing, i replaced, radiator,fans,thermostat. Now its mint, try any of those things,maybe your fans stopped working,or you have air in your cooling system
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Originally Posted by rjbrown87
(Post 8955907)
Please any suggestions helps.... My car overheats there is coolant in the radiator and in the reservoir.... I changed the thermostat that's on the same side as the alternator... The car temp gauge goes up as I drive sometimes it goes up then goes back down to the mid point... The fan on the passenger side comes on but not on driver side... Please help
(Had same problem!) |
Originally Posted by rjbrown87
(Post 8955907)
Please any suggestions helps.... My car overheats there is coolant in the radiator and in the reservoir.... I changed the thermostat that's on the same side as the alternator... The car temp gauge goes up as I drive sometimes it goes up then goes back down to the mid point... The fan on the passenger side comes on but not on driver side... Please help
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Originally Posted by Nelsito65
(Post 8956848)
The fan on the driver side should come on first as the car heats up. The one on the driver side usually comes on when you turn the A/C. At that point both of them should be working. It looks like your driver side fan went bad. Sometimes replacing the fan assembly makes more sense than just replacing one fan or fan motor.
But each cooling fan motor has its own fuse, so it's possible for the fan motor to be good and not run. |
same issue except...
I have owned this car for years and have not opened the cooling system so I know its not air in the system. Same issue except my drivers side fan comes on when temp gauge is way up but doesn't appear to drop the temp to a normal operating temp on the gauge. When i kick the defroster on the pass side fan kicks on also.
Any ideas for my case? |
Whats way up?
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Originally Posted by VenomsMax
(Post 8997342)
I have owned this car for years and have not opened the cooling system so I know its not air in the system.
Take off the radiator cap (when the engine is cold) and look in the radiator. The radiator should be completely full, no air at all.
Originally Posted by VenomsMax
(Post 8997342)
Same issue except my drivers side fan comes on when temp gauge is way up but doesn't appear to drop the temp to a normal operating temp on the gauge. When i kick the defroster on the pass side fan kicks on also.
Any ideas for my case? 1) The fact that the fan does not turn on until the gauge is registering high could be caused by 2 things. Low coolant level or a bad ECTS (Engine Coolant Temperature Sensor). 2) Both radiator fans are supposed to come on together. Start the car and turn on the a/c. Both fans should be running. If a fan is not running, it is bad and needs to be replaced. And the part about turning the defroster on... I'd have to see it to believe it. |
way up
Originally Posted by BronxSleeperMax187
(Post 8997344)
Whats way up?
My car is not actually overheating the sending unit for gauge is reading improperly, with scan tool hooked up ECT never reads higher then 203 degrees. At 203 fan kicks on and cools car down to around 195 using a IR thermometer checked at thermo housing temps are close to the same. Gauge reading almost to the first line in the H end of the spectrum. So would appear all is well minus what the gauge is doing. |
Originally Posted by DennisMik
(Post 8997475)
You've never looked at the level but you know it is OK. Sorry man, I don't believe that psychics are worth a damn at diagnosing car problems.
Take off the radiator cap (when the engine is cold) and look in the radiator. The radiator should be completely full, no air at all. You have 2 problems. 1) The fact that the fan does not turn on until the gauge is registering high could be caused by 2 things. Low coolant level or a bad ECTS (Engine Coolant Temperature Sensor). 2) Both radiator fans are supposed to come on together. Start the car and turn on the a/c. Both fans should be running. If a fan is not running, it is bad and needs to be replaced. And the part about turning the defroster on... I'd have to see it to believe it. Sorry i didn't type it out but the first thing i did was check the system to make sure it wasn't low on coolant after the car cooled down of course, which it wasn't low at all in fact. According to your two problems listed....they're faulty.... First using your windshield defroster activates your a/c compressor. Both my fans operate and function, at the time i checked just happened to not be both operating at the same time.... Read prior post I found the problem... vehicle isn't actually over heating Thank you for reading and trying to help though appreciate it. |
While I mis-understood the part about the defroster, I did not mis-state the part about both fans running at the same time.
Both fans should always run at the same time. If you ever have only one fan running, you have a problem. When the ECU determines that the radiator fans need to run, it applies a ground to pin 35. The wire connected to pin 35 is the energizing coil for Fan Relay 1. When this relay energizes, it sends 12 volts to both radiator fan motors, the low speed winging. When the ECU determines that the radiator fans need to run in high speed mode, it applies a ground to pin 36. This causes Fan Relay 2 & Fan Relay 3 to energize and send 12 volts the each fan motor's high speed winding. |
Originally Posted by DennisMik
(Post 8997740)
While I mis-understood the part about the defroster, I did not mis-state the part about both fans running at the same time.
Both fans should always run at the same time. If you ever have only one fan running, you have a problem. When the ECU determines that the radiator fans need to run, it applies a ground to pin 35. The wire connected to pin 35 is the energizing coil for Fan Relay 1. When this relay energizes, it sends 12 volts to both radiator fan motors, the low speed winging. When the ECU determines that the radiator fans need to run in high speed mode, it applies a ground to pin 36. This causes Fan Relay 2 & Fan Relay 3 to energize and send 12 volts the each fan motor's high speed winding. Good to know I'll check it out this weekend, I'm just glad I'm not actually over heating. |
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