I have a 1995 Honda Accord, At idle, in traffic, car tempature is below half way. When I go uphill, I hear a small squeel, and the tempature goes to 3/4. When I top the hill it goes back down. The Radiator is 2 months old, and so is the thermastat and fluid. Also all belts are tight. Could it be the fan, or the water pump, Car has 175,000 miles. Water pump and fan are original.
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Re: Car tempature goes up only on hills.
I think your cooling system has air in it, Try and find a place around the thermosat that can be opened a small valve it may just look like a nut, with your car running and radiator cap off, turn the heater on and fill with coolant till it runs out the valve with out air, then top off the radiator to full. also top of the coolant overflow tank. I think this may solve your problem. Merry Christmas!
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Possible thermostat faulty, Thermostat automatic, stays shut, till water reaches correct temp, if it goes faulty, (ie) does not open after reaching running temp, water will not circulate, so engine overheats
You may have air in the system, find the highest spot in the cooling system .Try open a hose and if there is a bleeder opening that.If it overheating at low speeds it is a water flow problem(volumn). I would suspect a bad water pump or a thermostat stuck partially open.The timing belt drives water pump and if it is loose then that could be a problem.if you replaced the radiator because of rust then the blades on water pump could be worn.Rust is abrasive.
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.
The common cause of this on honda's is the Idle air control valve, or IAC Sometimes you can remove the valve and clean it, but often you need a new one. It is usually mounted with bolts to the back side of the intake manifold.
There is a coolant passage that goes to the idle control system. The idle control itself is not bad. Cleaning this passage will make it normal again. I have fixed a 95 honda accord this way, and a 97 honda accord. You will need to remover the whole assembly. Actually the whole rapair doesn;t need parts so thats good news for you. Be carefull since the idle control is made of aluminum, and can be damaged easily. I damaged the one I was working on, thankfully I also have an aluminum mig welder so I was able to repair it like new.
the problem exist when the car goes uphill regardless of fuel demand. this sounds more like a transmission problem, check ur fluid if necessary have changed, have ur transmission filter system checked.if it were in the fuel system u would expirence this problem anytime u put fuel demands on the motor. but as u state it happens when ur going uphill which is the transmission job