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Answered 2011-09-14 00:08:12

Hey Ken==The radiator cap isn't sealing. Replace it. GoodluckJoe

If replacing the radiator cap is not enough then look at your radiator as the problem. Your radiator when the car is running should be the same temperature top to bottom. Run your hand down the radiator (careful you can burn yourself) and see if it is cool toward the bottom. If it is cool at the bottom but hot at the top your radiator is clogged. Flush does not work so save your money. I would start looking online for a new radiator their cheap enough. Good luck.


If it still vents with a new cap then the excessive pressure could be due to a blown head gasket pushing combustion pressure into the coolant system, if the vehicle has been overheated recently it is a good possibility

I had the same problem. Check your upper and lower radiator hoses. You might also need to replace your thermostat. The thermostat is a spring seal for coolant. These get stuck open and closed often for civics in the 1990's. I had to replace mine 2 times within a month. Part of it was my fault, because i drove it like i stole it. When your engine gets hot, the thermostat opens up and lets coolant in. When it is too cold, it closes and doesn't let coolant into your engine so it will warm up. Your thermostat probably got stuck closed. Also, check the little hose running from the reservoir tank to the radiator, it might be clogged.

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Why could your car lose a small amount of water in about a 45 mile radius.Then the low coolant lite will come on.The temperature gauge will go up if sitting in one spot after a run?

I asume you have found no obvious leaks in your cooling system, but your coolant level keeps going down anyways. Two possible causes, one every expensive, one very cheap. You may have a blown head gasket or cracked head. In that case, get ready to pay. However, you may just have a bad radiator cap. I learned this after I was told I'd need a $2,000.00 top end job on my Chevy Suburban: If the small rubber seal in the radiator cap goes bad it can allow the coolant to escape the system in the form of vapor during driving, leaving no puddles. Instead of wasting two grand replacing the heads, a simple $8.00 radiator cap saved the day. I Hope this helps you out. P.B.