When i am running my air or not and come to a stop, at a light my temp guage goes up past the half way mark almost to the hot line. when i take off it immediately goes back down and will stay under the half way mark as long as i am driving. i have checked and my fans are running when the car is sitting and idling why is it doing this i am a single mother of 2 small girls and i cant afford to miss work or get stranded due to this i need an answer so i can get it fixed. can anyone help me?
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air lock in the cooling system get a plastic bottle cut the bottom off turn upside down put on radiator filler and run engine cut full off water wait until all air bubbles stop then remove and put cap on see how that goes
The cooling system has an air pocket in it. The best solution is to have someone with a vacuum coolant system,and drain and replace the coolant. The only other way,is to jack up the front of the vehicle,and take off the radiator cap,and run it with the heater on full blast. Wait till the thermostat opens,(when coolant level drops)...then top it off while its still running.If you buy ,or have a friend who has a tool called an "Air Lift",..it will make this MUCH easier,and cleaner to fix.
If it is not an instrumentation problem then you have to assume the coolant is heat cycling. It could be because the cooling fans are not coming on due to the temperature switch, fans or relay. This would explain why the temperature increases when you are stopped and decreases when you are accelerating and air is moving over the radiator.
I would supect you actually have two problems going on here. First off it sounds like your guage is reading inaccuratly. When it is reading at one quarter it probably should be at the half way point. This is the normal operating range. The most likely cause is the temp sensor for the guage. When you pull a trailer and engine gets under a load the tempature sounds like its going up too high. Your engine light comes on because it uses a different sensor and is registering accurate tempature. I would start by comparing actual tempature of engine with what the guage reads, this can be done with a scanner or a heat gun pointed at the thermostat housing. I believe you will find a faulty sensor or possibly an outside chance of a bad guage.(but doubt it!)Once that is straightned out you will have to look at why is the engine getting too warm under load. I would start with radiator flow,A ristricted radiator either internally or externally will cause this. Good luck!
you can hook up your fan to a switch, fairly simple, auto zone would be able to explain it to you. so that when you turn on your car it automatically turns on and stays on, or so that you can turn on/off as you see fit. id probably have it run non-stop while car is going. i think they should all do that anyways, but they are trying to save you gas by having a sensor.
some of the factory gauges aren't very accurate if the fluid level is good and you get good heat inside I wouldn't worry about it, but I would keep an eye on it to make sure it doesn't over heat. If your still worried I would go to an auto parts store and pick up a temp. gauge there perty easy to install
Clean the IAC. Disconnect throttle body air hose and you will see a hole on the bottom of the throttle body just before the butterfly valve. Spray throttle body cleaner down the IAC hole and then let it soak about 1/2 hour. Reconnect hose and run engine about a minute and then repeat this process 2 or more times. Toyota engines from 1997-2005 commonly have the IAC get cruded up with carbon as early as 35,000 miles. This is a sImple and cheap repair that many repair shops don't want you to know.