Temperature gauge on my G3500 Chevrolet truck goes up & down

Chevrolet Venture Questions - My thermostat gauge in the ...

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CarGurusOct 2, 2014 - My thermostat gauge in the car is going up and down, what could be theproblem - My thermostat starts on cold and when i get in and drive it goes from low .... low to almost hot., and it jumps back and forth when I drive the car.

Temperature gauge shot up - Bimmerforums

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Nov 30, 2010 - This morning I had a problem starting the car as it was -22F and when I finally started it my ... Now the temperature gauge still jumps right to the red zone (all the way to the right). There is no way that this is right as the engine is cold. ... Even if it were stuck closed, it would take a while for the car to warm up.

Car Repairs: Coolant Temperature Gauge - YouTube

? 7:47
https://www.youtube.com/watch?v=fWjPX0_ibxY
Apr 15, 2012 - Uploaded by TheYoshiClan
... Caprice/Olds Delta 88 owners. If your coolant temperature gauge isn't working, check this out before heading out to get replacement parts. ... the car is barely getting warm inside. What seems to be the problem if you know?.

My car temperature gauge keeps bouncing around from cool to red ...

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check the engine temperature sensor ?

Can you tell if your water pump is working, is your water flowing at all can you tell. Here goes some info to help you. http://repairpal.com/OBD-II-Code-P0125

Thremostate sticking,,, get new one,,, drill a little bigger hole in the bypass hole,,on the new thremostat,,,1/8" bit,,,flush your engine with clean water couple of times,,, then put it new orange anti freeze for your engine,,, should be good to go

From what I just read about your vehicle,it has a history problem with the gauge,may be the coolant temperature sender or the gauge,it says the whole cluster will have to be changed to be fixed if the gauge is bad,found some forums and all had gauge problems.Right above the coolant temperature sensor is the coolant temperature sender,this is what sends the temperature to your gauge,the sensor sends a signal to the computer,they may have replaced the wrong one,here's a link to the sensor,the hole above it is where the sender goes,it's a one prong part,the sensor is a 2 prong part.A lot of people don't know that there are 2 types of coolant temperature gauge sending unit and sensor.

Yes it does have a antitheft system. (passlock) This is probably the problem.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

fans came late on those car,like 212 and second fan comes on at 224,you reprogram it to come a lot sooner,,other thing is there might be gunk inside the block,and coolant has hard time to pass through,and staying longer than enough in block temp goes high,even tough the radiator is doing it's job,it is just coming out block lot hotter than it suppose to be,and gauge read the block not the radiator

The gas tank sending unit has a float on it to register the amount of gas in the tank. The float is probably faulty which will cause erratic readings and is a fairly common issue with some GM units. Replacement of the sending unit should resolve that issue. As far as the coolant temperature gauge, it could be a faulty temperature sending unit or a thermostat that is stuck open or someone removed the thermostat. This will cause the engine to never reach operating temperature which in turn makes the engine run rich and can clog cat. converters and destroy some sensors.

Here's the thing. The ECU will shut down AC if the engine temperature is too hot. If the coolant temperature sensor is malfunctioning (lying to the ECU) telling it that the temperature is hotter than it actually is, the computer will turn the AC OFF.

Hmm, check your thermostat on correct behaviour, seen this before