Question about 1998 Nissan Altima

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Have a 98 altima and have to have the heater running on high or it overheats. In Az. right now it's not good. My thermostat, cooling system, I am desperate for any advice. Thank You!! I have never had this problem the car as always til now run with the needle right in the middle. First time I noticed it I was on the freeway and started to smell something, looked down and it was just about the the H, heard my Dad's little voice and slammed my heater on, the did lower it alot, almost to normal. Then didn't have any problems for like a month or more and then i t started again and turning the heater on does lower it, but not a whole lot just keeps it out of that red area. Turn it off let it sit a little start it and it shows cool, but if it hasn't sat for a LOOOng time it will jump right back up there. Sitting at red light heats up more, accelerate and it drops some. But not any where like it did at the onset. I am so frustrated, I should of listened to my husband when he tried to teach me. (lost to the Army) and then our oldest boy tried to teach (he left for navy in Dec.) and now our youngest son, well he didn't listen any better than I did!! So I will be very thankful for any help. Thank you very much!!

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Posted on Jul 29, 2009

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Thermostat may be stuck

Posted on Jul 21, 2009


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Replacing a thermostat

Buick Park Avenue Thermostat Repair Recommendations Best Practices
  • The entire cooling system should be inspected and tested when the thermostat is replaced.
  • A high-quality OEM thermostat should be used. Poor quality thermostats may not function properly and can cause damage to the engine or components of the emission system.
Common Symptoms
  • A thermostat that is stuck closed will cause the vehicle to overheat.
  • If the new thermostat does not immediately resolve engine temperature problems, the cooling system needs to be checked for other issues.
  • A thermostat that is stuck open can cause the engine to run colder than normal and set the Check Engine Light. It may also cause poor fuel mileage and the heater to blow cool air.
The thermostat will be at the end of one of your radiator hoses that goes into the engine block; normally at the top of the engine.

Feb 04, 2011 | 1995 Buick Park Avenue

1 Answer

How do I remove an air lock in the cooling system of a 2003 Altima?

Remove the top rad hose, raise it above the engine, the Altima's are a pain to add coolant to when emptied, run the car and keep adding coolant make sure the heater is on high. It takes a good 30 minutes.

Dec 30, 2010 | 2003 Nissan Altima

1 Answer

98 dodge caravan overheating...heater works..checked fans they came on later but when I drove it after it cooled down and it overheated...check engine lite came on.

About the only things are the thermostat and the water pump.There could be something with the radiator but that is the rarest because the water shoots straight through.If it overheats fairly rapid,it's most likely the thermostat.Sometimes a water pump will let you go 20-30 miles before overheat.The thermostat is cheaper and easier if you're going to try it systematically.Overheat will probably cause the check engine light too.Good luck! Greg

Sep 17, 2010 | 1998 Dodge Caravan

2 Answers

1st.temp. gauge went to 265 ,refilled jug .temp. gauge only stays down if heat/blower set to high plus anti-freeze light stays on tho anti-freeze in jug.

Re fill the system with the engine running and heater on high. Make sure that there are no leaks anywhere and that the electric fan is coming on as needed. If you see excessive white smoke from the tailpipe, coolant in the engine oil, oil in the coolant, you likely have a blown head gasket.
With the heater on, it acts as an auxiliary radiator ...that's why the temp becomes lower. Many times if the actual radiator is internally plugged, the heater provides just enough additional cooling to prevent the engine from overheating. If you continue to have problems and have checked for leaks etc., I would look there for problems.
One item: Your thermostat becomes unreliable after any overheat. You should replace it even if you find a problem elsewhere.
I usually begin testing by changing that because if it has failed, you won't find the problem and, I know I will be replacing it, for the reason I mentioned, so better to get it out of the way to begin with.
Good luck.

Feb 14, 2010 | 2000 Chevrolet Cavalier

1 Answer

Heater not blowing hot air changed thermostat and now car overheats

did u bleed the air out of the cooling system? if not dop this procedure and recheck for problems.
The generic method of bleeding air from the cooling system is to use a floor jack and raise the front of the car as high as poss, then fill the coolant recovery tank full and run the engine until it just starts to overheat, high end of normal zone on gauge, then shut the engine down and run cold water over the radiator core, this will self bleed the system and the coolant will be pulled from the recovery tank, repeat as necessary, never let the recovery tank run dry or more air will be pulled into the cooling systeml , if it still overheats then you need to have the head gaskets checked with a gas analyzer for hydrocarbons present in the radiator or recovery tank

Jan 11, 2010 | 2000 Dodge Neon

3 Answers

Car overheats and coolant boils

sounds like the thermostat may be sticking closed. i would check to see if the thermostat is opening or not

Jul 31, 2009 | 1999 Dodge Neon

3 Answers

Overheating engine

You have gone through a lot of trouble so far replacing parts. I wouldn't rely on rad additives for a fix sometimes they do more harm than good. You could just have an air lock in the coolant system. Did you try running the vehicle without the rad cap for awhile to release any air locks that may have occurred? Have you tried a new rad cap? Hopefully this advise helps you some what.

Jul 28, 2009 | 2002 Nissan Altima

2 Answers

Vitara overheat

When driving down highway only, it overheats? When running steady, I take it you mean, sitting idling? If it's only overheating at highway speeds, and all else has been checked out & is o.k., I'd take a close look at rad hoses for soft spots (easy to squeeze) that may be causing hoses to collapse at highway speeds & restricting flow of cooling system. Another thing to try is, turn your heater on high fan & high temperature when it starts to heat up & see if temperature gauge goes down (cooler) at all. If it does, then rad not doing it's job properly.

Jul 12, 2009 | 1999 Suzuki Vitara

1 Answer

Radiator whines and overheats when not moving

Have someone flush cooling system & check condition of rad for debris in front of rad & blow or spray it out as necessary. Next time it runs hot, turn your heater temperature up high, blower fan on high, and see if gauge starts to come back down a little. If it does, my guess is your rad needs replacing, or at least consider trying a good reverse flushing of the system first, then rad.

Apr 22, 2009 | 1998 Dodge Grand Caravan

4 Answers


Did I read that right and it has no thermostat?

Running it without a thermostat will cause it to overheat.

The problem is there is nothing to slow down / restrict the coolant and let the radiator do it's job.

A very common misconception on how cooling systems work..

Jun 06, 2008 | 1994 Chevrolet S-10 Blazer

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