Temperature gauge is not staying one place on highway speed

2006 NISSAN MAXIMA
160,000 MILES • 3.0L • 6 CYL • 2WD • AUTOMATIC
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FARHAN2149
  • MEMBER
  • 32 POSTS
On highway driving if my rpm is below 2 the temperature gauge stays at one place, but if I am driving 100 kmph and the rpm is above 2 then temperature gauge is fluctuating slightly up stay there for some time and then coming down, and on 100 kmph I pump hard acceleration the temperature immediately go down to normal position. What can cause this problem?
I changed twice thermostat, I changed radiator cap also. I change coolant, also bled properly. my heater also work good. By gun I checked the temperature of hose they are as they should b upper is very hot and lower is 15 degrees below now I think it is water pump. But I am confused because there is no sign of leaking or any squeaking sound. The engine is very silent and the both fans work as they should be.
Jun 12, 2018 at 11:50 PM
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STEVE W.
  • Experienced Mechanic
  • 15,295 POSTS
I would check the connector on the engine coolant sensor. It sounds like it may have some corrosion in it or the connector pins are slightly loose causing a poor connection. When you hit the throttle and the engine move the connection shifts. I would also check the engine to chassis and battery to engine ground straps. If one of those was corroded or failing a poor ground could cause gauges to act the same way.

Jun 13, 2018 at 9:48 AM
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