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Author Topic: Hot Engine Temp in Reverse  (Read 667 times)

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Offline James

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    • jayrich085
    • jrich0085
Hot Engine Temp in Reverse
« on: April 29, 2019, 06:49:44 PM »
My 04 Xterra (3.3; AT) maintains ~185 degrees F operating temp most of the time. I monitor it with an OBDII tool and not just the temp gauge.

If I spend any large amount of time in reverse (i.e. backing into a tight space requiring a few D>>R corrections) I notice the engine temp starts to creep up.  It's significant enough that the temp gauge needle begins to move up toward Hot.  Highest reading I've ever allowed it to get to was 3/4 way up the temp gauge.  Once it's back in D and moving forward engine temp comes down to normal, about halfway on the gauge. 

I should also mention coasting down a long hill will cause the inverse--engine temp drops to about 160.  This will move the gauge down toward Cold.

Cooling system was just checked and radiator serviced (new hoses and coolant) along with a timing belt service.

What's everyone's thoughts--Bad thermostat?  Fan clutch?  Something else? Or simply the way a belt-driven cooling system will behave in AZ temps?


-JWR-

Offline PitSnipe (Kyle)

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Re: Hot Engine Temp in Reverse
« Reply #1 on: May 02, 2019, 08:56:41 AM »
I would say to look at the fan clutch.
In reverse you are not pushing any air across the radiator. Which is why I believe your temps drops so far when coasting down a hill. Maybe look into an electric fan.
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