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Will a faulty car radiator cap cause radiator to leak fluid on top of radiator

Radiator is leaking at top. Can't locate where leak is coming from. Checked top hose for cracks and appears ok. It is also clamped on to radiator very tight. Don't see any evidence of cracks/pin holes on plastic top of radiator. Any solution(s) to this problem? Thanks, Jim

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: 2001 Honda CRV radiator leaking

There are dozens of possible sources for your leak, ranging from a split hose, to a bad water pump, a bad thermostat bypass hose, split in the radiator core, defective radiator cap, etc... If there aren't any visible problems, about the only way to find the leak is a radiator pressure tester. Buy, rent, or borrow one, and pump up your cooling system to around 30 psi. Don't go any higher or you could do some damage. The problem should show pretty quickly. Don't forget to check the radiator cap. I have had 2 in a row go bad on my PT Cruiser, one OEM, and one aftermarket. If you smell anti-freeze while driving, your heater core is leaking. Be very careful with any spilled anti-freeze since children and pets will lap it up because it tastes sweet, and polyalkylglycol is highly toxic.

Posted on Feb 25, 2009

  • 79141 Answers

SOURCE: coolant leak at the top radiator hose

the plastic radiator tank that the hose nipple is part of can be replaced by any radiator repair shot for about $75-100

Posted on Apr 06, 2009

  • 192 Answers

SOURCE: Leaking radiator fluid but not from rad., pink fluid, no hose leaks

A fluid leak that is pink and/or red colored is usually either power steering fluid or transmission fluid. I recommend checking both. You can check the power steering fluid when the car is off. However, the transmission fluid should be checked with the engine warm and idling in neutral. Have someone else step on the brake or use the parking brake and block the wheels while you're measuring the transmission fluid level.

Posted on May 30, 2009

  • 135 Answers

SOURCE: 1996 Acura 3.2TL Overheating Problem...

From your description of symtoms it sounds like you have a bad water pump. If the coolant is not circulating properly you will have a heating problem. Sometimes even a new thermostat can stick and cause the engine to overheat. I have seen them fail in as little as a week after they were installed.

Posted on Sep 14, 2009

  • 1 Answer

SOURCE: I have a 1996 Acura 3.2TL[V6] and it is overheating...

I had the same problem, whole new radiator, new hoses, new thermostat, and still overheating. What the problem was for me...bad radiator cap...all that money and a $20 fix...try it?

Posted on Oct 01, 2009


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