I have the GXP with the Northstar V8. It was leaking coolant into a cylinder. I took it in and the shop ran Blue Devil through it. I am no longer leaking coolant, however, my temp guage fluctuates with some overheating. It normally runs at 200 but gets as high as 240 before going back down. I have changed the temp guage since then and it still does it.
SOURCE: ford mondeo mk3, intermitent dumping of water from
You may have an air pocket in your system which some times happens. One way to get rid of it is to take the upper hose off on the engine side, fill your system with water until it runs out from your engine block, replace the hose, start your car turn you heater on and set to hi keep the radiator cap loose until the temp start to rise then close tight. Once the air pocket had been remover you can drain some of the water from the radiator using the lower drain plug and add antifreeze.
SOURCE: 2001 dodge stratus engine temperature gauge spikes occasionally
Look for a loose connection to the temperature sender unit on the motor.
If all connections OK, you may need a new temp sender unit.
SOURCE: antifreeze ts boiling back into reservoir.
it sounds like a possible head gasket problem,you can get the fluctuation from combustion gases getting pumped into your cooling system and creating gas pockets,i would suggest taking it to a shop and have them do a block test to look for combustion in the cooling system to confirm the problem,that way you will know for sure,if it comes up negative they can also perform a flow test to make sure there is no restriction in the cooling system such as a plugged radiator or a bad thermostat,hope this sheds a little light on it
Testimonial: "I bet you've hit on the problem ! Car has been "using " antifreeze for a couple years now, with no leaking anywhere. Lost through the head gasket ?"
SOURCE: 2004 Nissan Maxima temp gauge fluctuation
well the temperature control gage is connected to the engine block and consists of 1 wire for the reading of the motor heat either the sensor is going bad or you need to check your coolant levels in the radiator make sure the engine is cool before opening the thermostat cap to the radiator so not to get burnt ...also make sure the wire itself is not grounding out on the engine block to give the gage to give such a readout look to the engine and usually on the drivers side lower the plug wires you should see a plug with a wire coming from it ensure the wire is not rubbing on anything .
SOURCE: Temperature gauge fluctuates and the heater blows cold air
Sounds like the thermostat needs to be replaced. If you do the work yourself be sure the temp threshold is correct and the flow direction is correct when installed. Good luck to you
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