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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

6ya6ya
  • 2 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

emissionwiz
  • 75117 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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Trans fluid in radiator tray


You are leaking transmission fluid from either the fluid cooling lines that run from transmission to a separate reservoir in the radiator, or leaking from the reservoir itself. Hopefully, it's only the lines and may just need tightening to stop the leak.
There are two lines to the radiator's reservoir. One brings fluid from transmission to the reservoir, and a return line back into the transmission. Probably located on driver's side of the radiator, one will be near top of radiator, and one near the bottom. Small copper or steel lines that may also turn into rubber lines. Clean the area well with rags to locate the leak. Will probably need to have the car running to make it leak, while looking for it. You could also take a wrench and try tightening the fittings at the radiator, and tighten any rubber hose clamps that you see. If it's not the lines or hoses that are leaking, then the radiator may need to be pulled off for repairs or replacement. But 9 times out of ten, it is a leak from one of the lines.
When fixed, don't forget to check your transmission fluid level. Or keep adding till it is fixed.

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Bring your vehicle in for a cooling system pressure check. Another thing to keep in mind when inspecting leaks is that where you see the leak may not necessarily be where the leak is from. While the leak will drip down, the wind from when you're driving will splatter the leak all over the under-carriage of your vehicle making it look like leaks are happening where they in fact, are not.

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