Question about 2003 Toyota Corolla

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A/C COOLING LESS AT IDLING AND IN THE TRAFIC - 2003 Toyota Corolla

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I'd say that is fairly normal. the A/C system is just a high end heat exchanger. it sucks the heat out of the air in your car and blows it out the front of the car with a radiator-like device.if you are sitting still heat builds up around the front of the car and that hot air is less able to absorb more heat. it can produce a noticeable difference in A/C performance. try running it on max a/c. it reuses the already cold air in the car so it has to take less heat out of the air to achieve the same temp. also better for gas mileage.

Posted on Oct 03, 2009

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This sounds like your cooling fan is not running. If you were to stop too long with with the engine idling it would overheat the engine. I hate to be the bearer of bad news but this is a very serious issue. I can have a number of causes, like bad cooling motor, bad wiring or conectors, bad relay, open fuse, etc. Please have it diagnosed and repared before it overheats the engine and possibly damages the engine. If you are stopped in trafic you can place the transmission in neutral and shut off the engine. When trafic restarts you can restart the engine and place the transmission in drive again and continue. I hope this helps.

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I was traveling 5 to 10 miles an hours due to traffic for about 30 minutes. The aircon was on almost at the same time then suddenly, the engine temperature gauge went to red zone, which denote overheating....


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When you are running your engine the coolant is circulated around the engine by a water pump.
When the temperature rises to a pre set figure (ie 80 degrees C) the thermostat in the system will open thereby directing the water through the radiator.
The coolant gets a good deal of 'cooling' in the radiator purely by the airflow caused by the car's forward motion.
However when stuck in trafic, crawling along or in hot weather etc etc this flow is not enough and a temperature switch in the radiator (usualy) 'makes' and allows the electric fan to start thereby providing more airflow through the radiator and thus cooling the 'coolant'.
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