Temperature gauge is not staying one place on highway speed

Tiny
FARHAN2149
  • MEMBER
  • 2006 NISSAN MAXIMA
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
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.
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Wednesday, June 13th, 2018 AT 6:50 AM

1 Reply

Tiny
STEVE W.
  • EXPERT
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.
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Wednesday, June 13th, 2018 AT 4:48 PM

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