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Re: 1990 Honda Accord
Yes you can add water,however you have to remember that the boiling point of water is 212 degrees where as coolant mixture of 50/50 has a boiling point of 240 you have to get the vehicle to the shop and quickly. if you go too long the engine heads will either warp or crack and so will the block as well so find a shop and fast... please rate this
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If the radiator is leaking, put a bottle of radiator stop leak in it,fill it up the rest of the way with water, tighten cap, and run in idle for 15 to 30 minutes. If the leak is severe or one bottle doesn't work, use two bottles of stop leak and run for 35 minutes.
If it's the radiator cap that's leaking, replace the cap with a new one. Also check to make sure there are no loose cooling hoses.
Safety first: Use extreme caution to never remove the radiator cap when the engine is hot, severe burns from escaping hot water could result.
Is your cooling fan kicking on when temp rises?Are you running antifreeze or just water?Possible calcium buildup in radiator or water pump not working at full potential.. I could be more helpful if more detail info was given....