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Old 04 Feb 2013, 10:18 pm
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Join Date: Oct 2007
Posts: 4
Default Honda radiator cap doesn´t seal properly?

Hi.































I have a 2001 Honda civic 1.7































last year it overheated badly, we discovered it was the head gasket and replaced it (also the mechanic decked the head surface so it seated properly)















we also replaced:















water pump















radiator (NOT OEM but direct replacement)















hoses































Since then it ruined on the OLD OEM RADIATOR CAP (my car has over 100k miles) so last week i decided to replace it with a new one, so i bought one from my local HONDA DEALER































and now it´s spilling fluid from the reservoir, and when i press the top hose it makes a sound like squishing fluid to the reservoir EVEN WITH THE CAR COMPLETELY COLD































PLEASE HELP!!!































Does my radiator cap doesn´t work? whats wrong, i need to do a long trip in the car, i don't want it to fail on me
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Old 04 Feb 2013, 10:31 pm
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Posts: 137
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this same thing happened with my car, kind of. i lost the radiator overfill/resavior cap and every time the car ran it got antifreeze everywhere. if you look at the resivious tank you can see towards the bottom you will see a "full" line. make sure the antifreeze isnt above that. you may just have too much in there. also, if you have a radiator that isnt an oem replacement, but a direct fit from an after market company you shouldnt have to buy the cap from honda. if this doesnt work, try getting another cap somewhere to see if that helps. also, check the seal on the cap. make sure there isnt any depris that is stuck in there or anything like that. hope this helped.
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Old 04 Feb 2013, 10:47 pm
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Try and flip the radiator cap on its back on the ground and you can use a small hammer or whatever and bend the taps in a little at a time and see if that fixed the problem. The cap is not sealing the top of the radiator and when the car heats up all the water leaves and fills your overflow it sounds like.
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Old 04 Feb 2013, 11:03 pm
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i hope it is only your radiator cap giving you an issue.one of the things a bad head gasket can do is cause too much pressure in the coolant system.to check for this kind of blown head gasket symptom is easy.just make sure your reservoir is at the full mark and with the engine COLD start the motor for maybe 10 seconds and shut it off. then release the radiator cap.there should be no pressure at all coming out of radiator at this point,because the pressure should only come from the coolant being heated up.if there is pressure that means your head gasket is bad and is sucking in air while the motor is running and yes that will cause exactly what you are talking about. its an easy check so get busy and try it.
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