1997 Honda Accord temp guage goes up and down. It goes up when when idling @ a traffic light. It rises in between the half way mark and the H. When I accelerate it goes below the half between the C. What is going on??

Double check and make sure you have enough coolant in your system. Additionally why you are at it put in a new thermostat preferably the lowest temp allowable by manufactorer. A cool running engine is an efficent engine

change the antifreeze and flush your system, its been hot lately so the motor heat goes up too, having the AC on makes the motor work harder, so thats normal that the temp would rise when its on. traveling on the road allows air to help cool the motor, sitting in traffic slows the air, so there again heat will increase

Dear,

the fuel guage is fine but the wirring is getting earth to the body please check for the same rest is ok

thanx

There are several possible problems causing the temp increase.

1. Low coolant level
2. Leak in radiator hose
3. Leak in radiator
4. Bad waterpump

With low coolant levels by any 1 or a combination of 1-4, the vehicle will run hot at low speeds and at idle. Running the AC or heater pushes the remaining coolant through the system faster, aiding in cooling the engine but all indications are you've definitely have a cooling system issue that should be looked at immediately before doing damage. If the coolant level is good (when car is cold, open radiator cap and check for coolant level), the issue most likely lies in the waterpump.

its the HIC VALVE....it controls your idle common to older vehicle and almost work like a sensor. when the engine is on , coolant runs through it as the temp rises-it lowers the idle. calcium builds up in the coolant ports and restricks the coolant. located on the drivers side, on the intake manifold. (usually u can remove it, take it apart and clean or replace it, sometime you may catch one on ebay for cheap.

The next thing to do is to observe the car as it idles for 10 minutes to ensure the electric radiator fan is coming on if not replace the fan relay if that doesn't work replace the coolant temp. sensor that activates the relay that activates the fan after that ti can only be the fan itself that is if the fan is not coming on.

how old is your coolant?
try changing your antifreeze

it sounds like to me that the cluster could be going bad or the spedo cable is sticking and the temp sensor on the block is bad

if ac dont work idleling it start to work when you move our fan is not coming on because when you activate the ac compressor kick in and fan should come on if it start to be cold only when you drive the force air cool the condensor ac work temp goes down HOPE IT HELP FIXYA OUR POST THANKS . PIERRE

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.