Question about 1997 Nissan Maxima

3 Answers

Overheating my car was overheating so i put some coolnat in it is fine now but i was wondering should the two fans run when the car is on or only when the a/c is on, when i turn the car off it sounds like the car doesnt completely shut off it sounds like the fans are going? and help would be great. oh yea what would be a reason why my car would need coolant if there is no leak in sight?

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  • deneeta43 May 24, 2009

    OK THANKS SO MUCH WELL HOW MUCH COOLANT SHOULD REMAIN IN THE CAR? SHOULD IT ALWAYS GO IN THE RADIATOR OR THE PLASTIC CONTAINER?

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3 Answers

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  • Nissan Master
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Yes, needing to add coolant, obviously calls for some investigation. Check & make sure coolant return bottle doesn't have a slow leak. Perhaps after a good drive down the highway, park it somewhere that you will see any liquid under it, after it sits for a while. Other option is to take it to a rad shop, or repair shop & have them pressure test the system, which shouldn't cost much, if anything. If it reveals a leak, then you need to dig a little deeper for cause. As far as the 2 fans coming on, usually passenger side will only come on with AC or defrost on, the other should be coming on regularly when coolant temperature in rad reaches proper temperature that requires cooling .

Posted on May 24, 2009

  • Mike Butler
    Mike Butler May 24, 2009

    I always top up rad when engine cool, then run it for a while with heater on, to make sure it doesn't have an airlock, then after it has reached operating temperature, rad fan has come on & off a couple of times, I leave it an inch or 2 from top of rad, put my cap back on, then top up the return bottle to mark on side of bottle.

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  • Nissan Master
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Both fans when a/c on. running after shut down normal.
Coolant loss is a good sign that something somewhere is leaking. If loss is minor, it will be difficult to find, and may be burning off before it reaches the ground while driving. A careful inspection of all connections and a good look under the engine for greenish stains may give you a clue. Sometimes just re-tightening all hose clamps slightly can help (don't go crazy with this there is a point where you can damage the hose.)
Obviously, it has to be leaking somewhere. It is possible to have an internal leak as well, from cylinder head gaskets etc. Prolonged white smoke or a persistent miss in engine are clues to that. Hopefully you will find leak elsewhere though!
good luck

Posted on May 24, 2009

  • Richard Scordino May 25, 2009

    vehicles with radiator caps can be filled best by adding to radiator first, then filling bottle. Best to do this with engine running from cool, permitting it to warm up while adding, but can also be done cold. Just never open when hot.

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  • Master
  • 4,669 Answers

The fans will come on with A/C and if the temp goes above about 235. The fans are on a battery circuit so it is possible for the fans to continue to run after the key is shut off for about a minute or two.

Posted on May 24, 2009

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