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i have a 1997 honda accord lx 4 cyl. I have an “overheat” on the interstate but not while im driving around town. It doesn’t overheat to the point to where i have to pull over but the temperature gauge goes above what it normally sits at. It will sit usually about the half way mark for awhile and occasionally it will just drop. I have noticed that i can switch on the heat for a just one second and it will drop immediatly. I’ve been driving this car for awhile and i know this isnt normal. In the past ive replaced the radiator, both cooling fans, timing belt and water pump. I went out and bought a new thermostat for it thinking that is the problem. Any insight on my problem given the symptoms?
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Honestly, I don’t think it’s your water pump because then your car would be overheating ALL the time. I would drain the coolant out and instead of mixing the 50/50 coolant/water combo yourself, I would just buy the already mixed stuff, fill it up, and then bleed the system…give that a try. Good luck!
Do you have circulation of the cooling system? Did you try feeling the heater core hoses and radiator hoses to see if there at temp?
been driving the car still and it still overheats. ive bled the cooling system free of any air it could have. I hooked up my scan tool and noticed that the cooling fans kicked on at 208 degrees F. Im thinking that is a bit too high?
No. I’m not quite sure how to check it. I have the service manual but i cant find anything about the coolant temp sensor or coolant temp switch anywhere.
The cooling fans are actually controlled by a fan timer unit under the dash. I cover it’s operation in this video. Based on your description however I would say that you might have a flow problem meaning it COULD be your water pump. It’s not common but it kinda makes sense due to the fact that it overheats when driving down the highway. Also, if your timing is off it may overheat so be sure your timing marks are lined up.
I know this is late but i found out what the problem was. My thermostat was sticking at times. Replaced the thermostat and the problem is fixed. Hope this helps somebody out.
[quote=”WDHewson” post=46339]In the old days the rubber rad hose to the coolant pump inlet would would collapse due to suction and stop flow. Only happened on the highway with continuous high speeds.
Put two fresh stiff rubber hoses to and from your rad.[/quote]
That’s not what causes that condition. The condition you mention would be a faulty radiator cap as that’s what regulates pressure OR vacuum in the system. The hoses have nothing to do with it.
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