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Hi my 1998 nissan maxima has recently been leaking water from unknown areas...it is also leaking from the whole top of the radiator. Just realized only one of the fans is working and it always smells hot when sitting even though the guage does not read hot. What could be causing all of these problems? It has been hooked up to a code machine and the only thing it says is a map censor. Could that cause the problem?

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  • Cars & Trucks Master
  • 21,873 Answers

I doubt it.
The map sensor code is for the sensor that measures engine vac.
Its possible you have a blown head gasket which would allow pressure to build up in the cooling system. Or you just have some leaks not connected to any other problem.
As the coolant leaks onto the hot engine, especially the exhaust pipes, it will smell like burning coolant.

Posted on Jan 08, 2013

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Posted on Jan 02, 2017

  • 255 Answers

SOURCE: overheating 1989 nissan maxima also radator fan won't come on

Hi,must of the time when fans stop working is because a fuse or a fan relay is burned ,it is also posible that the fan motor also burn out,there is a temperature switch at the cilinder head that can go bad and the fan will not go on. this should do it .....

Posted on Sep 01, 2008

Mustgo
  • 2359 Answers

SOURCE: Nissan Altima running hot

When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
Please post more information by clicking the comment link on the top right corner.

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Posted on Dec 05, 2009

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  • 770 Answers

SOURCE: 1998 Subaru Forester Overheating, top of guage.

An overheating issue can be caused by a few different things, the most common cause of overheating is a sticking thermostat..it is a $7 part that is very easy to replace, it needs to be eliminated from the mix. Second most common would be a faulty water pump, this is usually characterised by a leak at the pump itself. If you are loosing coolant, you need to make sure it is not getting into your oil, you can check the dipstick for bubbles or a milky looking sludge. This can be caused by a cracked head or blown head gasket, these conditions are usually caused by the overheating itself, so if this is not the case, be careful and do not let it get too hot! The other thing that can cause an overheating issue would be a clogged radiator. The fan issue is problably not causing your problem, because at 35 miles per hour, enough air is being forced thru the radiator to effect cooling. The fans are good for when your car is sitting still. The electric fans are controlled by a coolant temp sensor. Good Luck! I hope you find this to be very helpful!

Posted on Feb 18, 2010

  • 6 Answers

SOURCE: Nissan Largo 2.0TD 1993, radiator overheating and

I have the same problem but its my interior heaters that wont work my garage says theres two parts to the system poss 3????
take the driver seat out theres a cap to fill there. I kinda thinking Ive got head trouble as my thermastats ok...topping up all the systems does work for a bit on my findings..

Posted on Mar 23, 2010

BCAS1298
  • 3092 Answers

SOURCE: radiator fans are not working, is that a

No it's elec. check cooling temp. sensor, will sit close to the thermostat housing, also check cooling fan fuse and relay. also when temp gauge at about haft way up check voltage at cooling fan connector, if there is voltage replace cooling fan. also with a/c on fan should come on right away, check voltage at fan.

Posted on Jun 03, 2010

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