sounds like a bad thermostat even though it is replaced
yes if you live in a cold area it could help, example, a 160 degree thermostat will open before a 180 degree thermostat, thus letting the warm coolant from the block to circulate thru the radiator and heater core, thus giving you warm air for your heater faster than a higher rated thermostat
If a thermostat is stuck open it will cause the "bubbling". The thermostat opens and closes giving your coolant time to cool off in the radiator. When stuck open the coolant will keep circulating and just get hotter and hotter until overheating occurs. You should change it right away. I hope this will help you. If by "open" you mean that it is stuck in a position which allows coolant to constantly flow then the last answer is FALSE. If it is stuck open, and coolant constantly flows, then your engine will not heat up to the proper temperature. It will constantly be cool, because guess what, that's what coolant flow does. That means your bearings will not expand properly and such causing a host of other engine problems. If it is stuck open, then you need to replace it.
If it's anything like the '05 V-6, it's located towards the front of the (driver's side) engine block. A diagram from Autozone repair guide can be found here: http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0996b43f80382f1e. Gonna replace mine, along with thermostat this week. BTW, is your check engine light on, and giving you a code saying that either the coolant is low, or thermostat/coolant temperature coolant sensor is bad? Best of luck.
Flush the coolant, change the coolant resevoir and add new coolant, it doesn't hurt to change the hoses either
your cars thermostat could be broken, making the coolant+engine not heat up, sucking the coolant from the expansion tank because its cold and giving your car a rough idle cause it has a hard time warming up
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Either there's a problem with your sensor, or there's a problem with your thermostat, and it's giving a false reading. Your engine temp may actually be high, as well - what you see on the gauge is the temperature of the coolant, not of the block itself.
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A thermostat in general, is an assembly that measures temperature (if it measures room temperature then we are talking about a room thermostat) and trips an electrical contact on and off comparing measured temperature to a temperature setpoint (the temperature setting we set on the thermostat by means of a rotating knob or a digital screen and buttons. In an hvac system, we install a thermostat inside the room in which we want to control temperature and we set the desired temperature. If current temperature is below setpoint, then the contact trips, and the heating system heats the room. When measured temperature reaches the desired setpoint, thermostat trips off and the heating system will stop giving energy to the room. By starting and stoping the heating system, we achieve to set room temperature within some limits.
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is the coolant temperature sensor giving a correct reading to the computer? Is the fan getting power?