I once changed the prestone on my car (Chevy 97)and after that, the temperature went from normal to a little hot. I changed the thermostat and temperature went back to normal. I assume the new prestone made the thermostat more "stiky" and It could not open as freely as before. Hope this help Normand Also make sure there are no air pockets in your cooling system, but most likely it is an intermittent problem with your thermostat, they are cheap and easy to change, I change my thermostats almost once a year anyway. If after all of this you are having the same problem then maybe the temperature sending unit could be corroded or faulty or the water pump impeller could be worn. With the gauge at about half way or a tad higher the cooling fan should kick on and the Temp. gauge should fall rather quickly within a couple minutes to about a third of the way.Then the fan shuts off. Does your cooling fan run? Do you ever hear a gurgling sound from under the hood or under the dash? The gurgling sound would indicate air trapped in your cooling system. I hope this helps as well, Randy...
It's dependant on what you want. If you live in a hotter climate, select a lower temperature thermostat; that causes the thermostat to open sooner, keeping the engine a little cooler... hopefully. If you live in a climate that is either normally cooler or seasonably cooler, a hotter thermostat can help the heater work better. A hotter thermostat has been demonstrated to be SLIGHTLY (almost insignificantly) at helping the engine run more efficietly.
Thermostat tempratures are more a function of the local temperature average. If you live in an area that doesn't get much above 100 degrees and gets very cold during the winters such that you need your heater to work well, I'd use a 195 degree thermostat. If you seldom need the heater, you can get by with a 185 degree thermostat. In either case, if the engine runs a little warmer but still within the normal range, it will perform a little more efficiently and give just a little better fuel economy. I almost ALWAYS use a 195 but then I always keep my radiators clean.
There are multiple reasons for that. First of all the thermostat must installed in the proper way. There is a valve which must at it's maximum vertical position. Also if you have bought an aftermarket part you might made a mistake. It's because aftermarket parts a little higher opening temperature. You have two choices: first one is to buy the thermostat from Toyota; second is to but so called "low temperature thermostat" which opens before required temperature is reached. If you live in a cold state you need to buy OEM part because low temperature thermostat effectively decreases temperature of the heating system.
only time a thermostat needs replacing is if it doesnt workgenerally when they quit, the engine will over heatthis is caused by the thermostat not opening properlyeasiest way to test this is to get engine to running tempthen with engine running a little faster than idle, remove radiator cap and look to see if the coolant is circulating in radiatorif no circulation, the thermostat has not opened and needs replacementonly other way to test is to remove thermostat from engine and test in bioiling waterbut if you do that, u may as well replace it while it is out
Everyone knows that a thermometer merely registers the temperature in a location. But a thermostat has the ability to control the atmosphere around it. Even though it may be small, a thermostat has the ability to cause major changes where it is installed. A great tip for wisely using a thermostat is to always remember to set the thermostat down to a lower temperature when one is planning to be away for at least a few hours or more. Simply adjusting the setting down a few degrees can help immensely on lowering costs. Imagine how much money can be saved by lowering the thermostat if a person will be gone for an extended period of time such as a weekend or more. Additionally, nighttime is a good time to adjust the thermostat down a little lower. Many people find that they actually sleep a little better when the temperature in the room at night is slightly cooler than a daytime temperature. Not only does the slight adjustment add to a good night's sleep, but it also helps lower the monthly bill for the energy source providing the heat. One point about lowering the setting on a thermostat that many people fail to consider is the savings that will be produced when a refrigerator or freezer is not required to run nearly so much to maintain a cold internal temperature. The warmer a room is kept, the more a refrigerator will need to run to compensate for the raised room temperature. While many people may think this is a trivial matter, over time the cost of a refrigerator running constantly can really add up. If each degree a thermostat is lowered during an eight-hour period accumulates to mean a one percent savings on a fuel bill, then it is definitely worth attempting to drop the temperature by a degree or two for a trial period. If a person lowers the thermostat while away on a trip during the winter period, it is safe to set the temperature around 55 degrees. That will prevent water pipes from bursting and will provide a nice savings on the next utility bill.
The cooling machine in a fridge doesn't run the whole time. The thermostat turns the cooling machine on when the temperature is just a tad over the target temperature, then it will run until the temperature is a little below the target temperature. Then the cooling machine switches off, the temperature will slowly creep up above the threshold, and the machine will start again.
I suppose when you say " the air stops blowing but the unit is still running" you mean the air that is blowing is not cool. If so, then the thermostat is faulty or needs to be set a lower temperature setting. If the unit blows cool for a few minutes and not cool for a few minutes, then cool again, etc. (called short-cycling), the unit is low on freon.
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