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It could be due to a number of causes including a bad thermostat which is intermittently sticking half open as you have mentioned.
1. The first thing you must do is check the coolant level in the car when cold and make sure it is right up to full.
2. If there is air (air pockets) in the cooling system you can have similar symptoms although normally the overheat problem would occur every time you drove the car with the high enough RPM to cause the overheating. If the coolant has been removed for any reason recently and replaced the air needs to be bled out of the system because there will always be trapped air when you drain and refill.. Some mechanics don't bother doing this or don't do it properly.
3. If the cooling fans are only being triggered intermittently when the coolant reaches the predetermined temp then you could have the same symptoms. When the overheat condition shows up your cooling fans should have kicked in . If they are not operating then that will be your problem or part of your problem.
4. There could be a partial blockage somewhere in the cooling system which is intermittently retarding coolant flow. You need to have the system emptied and flushed very 2-3 years to prevent these kinds of problems. In addition, the effectiveness of the coolant (to protect the engine, lubricate the water pump etc... ) breaks down over time and must be replaced for this reason in any event.
Look on your exhaust manifold. What you are looking for is a little bleed screw. Mine is painted blue. Yours maybe a different color. When you find it start your engine and let it idle for 3-5 minutes. Make sure your heat is turned on full. With the enging running turn bleed screw counterclockwise till water starts shooting out. Let the water continue to shoot out until you get a steady stream. Once you get that steady stream then tighten. Your system is now bled.
have a radiator shop pressure bleed the coolant system to remove air trapped in the system ( probably in the heater core and not allowing full coolant flow all the time . Regardless of the air temp the thermostat will keep the coolant temp at approx. 85 degrees C. As to the cig socket check the fuse first . If the socket fails it will dead short. The little element in the knob bit are prone to burning out . Get a plug in for the lighter and attach a light across the wires (multi meter) turn on to accessories or run on the ignition switch and see if you have power Tests fuse and socket
This is usually caused by air in the cooling system. While the engine is cool, check your fluid level in the coolant tank. Then check the radiator to make sure it is full. If both of them are full, the system has to be bled. To bleed the system, take the radiator cap off, start the engine. If there is air in the system it will bubble out and the fluid level will drop, add coolant until this stops.
The temp reading on the dash is a very big clue... Likely the thermostat (at the end of the large top radiator hose inside the metal housing) is stuck open. When that happens, the coolant in the engine never reaches full temp. Not only can that result in a low heat condition but it can also give you poor fuel mileage as the computer always thinks the engine is cold and therefore it adds extra fuel to keep it running. Replace with a 195 degree(f) thermostat, run the engine (with the heater on full heat) to nearly normal temp, turn it off and wait about three minutes, then re-start and continue filling. Once full, add whatever is necessary to the recovery bottle and close it up and check for leaks.
the tempersature you say is 210,is that what the guage says,or have you got a thermometer to verify,because,with antifreeze in the system,the most efficient temp for the engine is 90C OR 210F,WHATS THE PROBLEM IF ITS NOT BOILING OVER ???(QUESTION)
completely normal those readings are perfect this car comes with a 195 degree thermostat,210 is fine for stop a go traffic remember a cooling system with the proper amount of coolant in it and under pressure will not overheat till about 240 degrees your in great shape no conerns!!!!!...
Flush rad & change coolant & thermostat. Check operation of rad fan, & make sure it is coming on when engine reaches normal operating temperature. Be sure to bleed air out good when refilling rad/cooling system. Start engine & turn heater on when refilling & let rad fan come on & off at least 2 or 3 times before putting cap back on rad, and refill rad as needed as you do this. then fill return bottle to proper level & see what happens.