What can be the possible cause for this and how can i rectify this problem
Check temperature switch or extra fan.
Probably radiator fan switch A or B, or radiator fan main relay, or maybe only the fuse in under the hood fusebox. When you drive, the wind cools yours car cooler and temperature goes down.
It sounds like your radiator fan is dead. You should check for a blown fuse first, but you may need to replace the fan assembly itself. It is there to pull air through when you aren't moving, thereby cooling the radiator and keeping the engine from overheating. When you start moving, the air starts flowing over the radiator again, cooling it off. From what I can find with a quick search, it looks like you only have an electric fan. There are some diagrams in this post regarding replacement:
http://www.odyclub.com/forums/9-problems-concerns/152298-2004-honday-odyssey-radiator-fan-motor-replacement.html
You can also find a replacement fan online at places like RockAuto, partsgeek, and Autopartswarehouse. You can get the fan online for (on average) about $75.
Check to see if the fan comes on if not check fuses if it comes on flush engine and radiator then change the thermastate this should cure the problem
SOURCE: temperature gauge
Well let's see....You did not say the temp of the heat changed inside
your car... if it does NOT ...I say the gauge is messed up....
A thermostat usually sticks open or closed.. if it is broke.
If it is defective the car will start getting hotter under a load going
uphill or....when the a/c is running it will not put out cool air while
sitting still at a stoplight or heavy traffic..
SOURCE: 2000 Honda Accord - engine overheats when stopped
There are only a couple things you can check. First, I would make sure the gauge is reading properly by checking the fluid temperature manually. Newer model cars have temperature sensors that can malfunction but they will usually set your check engine light off it that is the case. Check your radiator fluid. While the engine is cold!! See if it looks dirty. Rub it between your fingers and see how viscous it feels. Make sure the radiator is full. You may just need to get your radiator flushed. A lack of flow will cause an overheating condition. When your back in motion the engine has more pressure to circulate the fluid. When the car is moving there is airflow that also aids in the cooling process as well. Other than that you have a thermostat which could be sticking and causing it to overheat. Or the water pump is bad. A flush and fill and replacing the thermostat are fairly cheap and usually a lot easier to do than replacing the water pump. Especially on a Honda. Usually you will hear a squealing noise if your water pump is going out and there is, I think it is called a weep hole on the pump itself that will start to leak when the pump is going bad.
SOURCE: 2003 Honda Civic runs hot when idling.
Check the cooling fan switch. It appears your auxiliary electric cooling fan isn't going on when at idle. and engine temp increases. While you are driving, air is being rammed thru your radiator as you cruise along, so it isn't overheating, at idle, that isn't happening, and the fan should go on as the temp goes up. When the ac is switched on, the fan is being signaled to operate due to the heavy ac load on the cooling system.
SOURCE: Temp Gauge went to high
It could be 3 things: Temp sensor, thermostat, or fan relay. Fans don't usually turn on until car has been idleing for a while. I first would change thermostat, then relay, then temp sensor. Coolant must be 50/50 mixture for water pump to have proper lubricant from antifreezer. Do not go any further than a 60water/40antifreeze mix
SOURCE: my temperature gauge goes up when im at a stand
1.Low coolant level,2. restricted rad. ( full of dirt, bugs etc.)3. Idle too low.4. Fan not cutting in.5. Water pump.
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