Anyone have this problem with their temperature gauge?

[juanX]

I have a 2008 Skyline 370gt with about 160,000 km on the clock currently.

A while ago, I noticed the temp gauge would start climbing but it comes down when I give it some throttle. I took it into the shops. The technicians comments are transcripted below. Reported they couldn't find anything wrong with the vehicle mechanically and they pressure tested the cooling system. Funnily enough, the technician commented that the temperature dropped back down when the car is stationary but this is when I'd notice the temp gauge to be climbing.

Just wondering if anyone else experienced anything similar to enlighten me? Cos at the onset, the temps were going up one tick and then comes back down when I step on it. Now, the temps are climbing all the way to the top of the gauge, and it's making me very nervous lol. It also doesn't come down to the neutral position anymore.

PS I do have a small exhaust leak near the drivers side caused by when I got f**ked by a really steep driveway at a mall I never visited before. Not sure if this would affect the sensor.

Technician comments:

Check and verify Fan/Cooling system - ALL OK max 106*C and fans operating at 100%

Cools down right away.

Checked Fan Operation - 55%@101*C, 85% @ 104*C and 100% @ 105*C

Vehicle did not exceed these temperatures with max load.

Temperature recovered back to 99*C after fan operation while vehicle Stationary.

[GTSBoy]

So, it's clearly an electrical problem. Either with the gauge itself, or the sender. It appears to be voltage sensitive (ie, alternator output affects the reading.

[MBS206]

I'm with GTS, that's not an actual overheat issue. That's an electrical issue.

[sunsetR33]

Read the ECU for fault codes or have someone else do it. A faulty coolant temperature sender is usually listed in ECUs. If the sensor itself is not busted it can also be a bad ground connection.
Or in a really unlucky case, damaged wiring.

Edited April 10 by sunsetR33