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Car Temperature Gauge Fluctuates Rapidly
Car Temperature Gauge Fluctuates Rapidly. The temperature gauge sitting at about the half way mark is normal operating temperature in most vehicles. The truck is on 134a.

My banks confirms the temp change. * if the gauge is reading the voltage from an electrical sending unit, then the reading is dependent on a steady voltage to the sending unit. Have a block check done to see if that is happening.
Discussion Starter · #1 · Jun 28, 2004.
There may be a air bubble causing the heater problem but there may be head gasket problem and exhaust gases are getting into the coolant and causing the trouble. I would check your gauge with a scan tool. The truck is on 134a.
If You Still Have Warranty Get It Checked.
The temperature gauge sitting at about the half way mark is normal operating temperature in most vehicles. If you are worried about air trapped in the block, drill a couple 1/8 inch holes in the perimeter of the thermostat flange. If any of these systems don’t respond while your car is idle, the engine’s temperature can go very high, causing the temperature gauge to shift from the normal zone to the “red” zone.
My Banks Confirms The Temp Change.
If your engine is not over heating, it may be just an electrical/instrument cluster problem, which is not uncommon. Started riding with coworker only driving to her house 7 miles. Usually the only time this is really noticeable is when the engine has been working hard and suddenly has to wait at a junction or similar and the gauge can rise considerably.
* If The Gauge Is Reading The Voltage From An Electrical Sending Unit, Then The Reading Is Dependent On A Steady Voltage To The Sending Unit.
Ok so my temp gauge is fluctuating sometimes alot more then some it goes all the way up to overheat then goes back down to normal i just replaced thermo stat burped the radiator then a little bit ago it started fluctuating alot more and now when i get done driving it theres alot of antifreeze in the overflow tank and i can see that it comes out of the top of it to. It's pretty common for the temp to fluctuate this much, certain locations for the temp sender are more sensitive than others. However, the oil temp gauge always stays exactly where it should.
Check The Coolant Level And Make Sure It Is Full.
If your temp gauge is not staying stable, it keeps going up and down and you have po300 code, you will have to troubleshoot the problem until you find a solu. Toyota passenger and sports car forums. I have changed both sensors for gauge, changed thermostat and flushed everything and burped air from system, and my temp keeps going up and down.
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