The thermostat gauge on my 2009 Chevy Aveo goes from normal to high then back down to normal while driving. It does this periodically. What does this mean?
When the coolant reaches a certain temperature, the rad fan will cut in until the temp drops enough. That could be what you are seeing. As long as it's not ever running hot you have nothing to worry about. Be sure the coolant level is where it should be.
SOURCE: Temperaure gauge/thermostat 2001 chevy tahoe
yes, your thermostst is sticking open or closed. it is an easy fix and the part isnt that much but you do have to drain some of the antifreeze/coolant out. when you get the thermstat pick up a repair manual for your truck and it will take you step by step.
SOURCE: Car Overheats after 12 to 15 minutes of running. Temperature decreaes when I accelerate.
your fan is the problem...it's not turning fast enough to cool the engine off. I need more info on what type of fan you have....elec fan or a clutch fan?
SOURCE: my 1994 acura legend keeps overheating
when bleeding the system to get the air out, you may want to turn of the heater to help get all the air out of the system.
SOURCE: 1997 2.4L Chevy Cavalier LS; Low Coolant Indicator and Temp Gauge
take the cap off of the radiator (whil engine is cold) start and run the vehicle. keep runnig 30mins after the vehicle is hot keeping notice of the rad fluid level.
keeping the cap off will prevent the pressure build up that woiuld keep the air in the system, keep adding water or antifreeze as the level goes down. this may take an hour or so.
also with the cap off, you will be able to see if your water pump is operating correctly. you will visibly be able to see movement in the rad when the pum is engaged.
SOURCE: Honda 98 CRV temperature gauge goes way up after an hour on hwy
You will need to change your thermostat as it is stuck and is not responding correctly to temperature changes. Have your mechanic change the thermo, do a flush of the system and all should be good again.
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