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Why is there a small hole in my new coolant reservoir?

2009 dodge charger 3.5 V6 SXT automatic. No one can tell me why this small hole is there. How can I do a pressure test if the hole is there? After installation, I want to do a pressure test for leaks but, concerned that this small hole will not hold pressure in the reservoir for pressure testing. Thanks in advance for any help

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  • Dodge Master
  • 49,960 Answers

If it has a radiator cap on the radiator , you connect the pressure tester there

Posted on May 04, 2018

Testimonial: "How can I do a pressure test on the reservoir which has a radiator cap if the hole is there? After installation, I want to do a pressure test for leaks but, concerned that this small hole will not hold pressure in the reservoir for pressure testing."

  • 2 more comments 
  • Bill Boyd May 04, 2018

    are you saying that there is no radiator cap on the top tank of the radiator
    If that is the case replace the reservoir or may be it would be easier to take it to a radiator specialist shop if they all have holes in the reservoir

  • Neil Williams
    Neil Williams May 05, 2018

    The hole was manufactured that way for a high pressure release. The reservoir has a divider inside.

  • Bill Boyd May 05, 2018

    if that is the case then the release will be slightly higher than the operating pressure of the system
    The max pressure is on the cap

  • Neil Williams
    Neil Williams May 05, 2018

    I want to do a pressure test for leaks but, concerned that this small hole will not hold pressure in the reservoir for pressure testing



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SOURCE: 2002 freelander coolant leak

My coolant leaked out and on top there is a large hard plastic container, I had to replace it, that stopped my coolant leak.

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SOURCE: 2001 ford focus wagon coolant problem- Pressure

You may be developing a worn head gasket which can allow oil to flow into the engines cooling jacket. If your engine is running rough this is usually a good idication that there is a head gasket leak.

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SOURCE: 3 weeks ago I had a holed radiator replaced was

could be the water pump itself. i"ve seen pressure tests hold and when pressure is down the seals in the pump leak. if you can see the pump, look closely and see if it slightly misaligned. if it is the pump is bad

Posted on Jun 14, 2010

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SOURCE: My Granddaughter has a 2003 Honda Civic which has

Hi, its not good news im afraid by you describing that with the coolant cap off and revving the car causes the pressure to build up and push the water back out it sounds to me like the head gasket is on its way out, what you need to do is take it to a garage and dont have a compression test done you need to have a gasses test done, you can buy these yourself if you want to and what it does is this.

its a plastic tube with blue liquid inside it then you take the coolant cap off and place this in its place you then run the engine and rev it up then you squeeze the rubber at the end of the tube and it then sucks the air out of the coolant and through this liquid then if it detects gasses from the engine in the coolant then this turns the liquid green and this is then telling you that the head gasket needs changing.

please dont let it keep over heating as this will cause the cylinder head to warp and you would then need to get it skimmed to make sure its not warped, get the gasses test done as a compression test dont give you a true reading as the engine is not running when they do a compression test.

let me know how you get on or if you need further assistance ok

plz rate this solution as i have a whole page of unrated posts, thanks

Posted on Sep 21, 2010

  • 3400 Answers

SOURCE: Water pump 2004 suburban, coolant

Possible leak areas waterpump, heater core, intake manifold gasket, radiator or hoses. Waterpumps have what they call "weep holes" which is an early warning system to prevent major damage when pump fails. The weep hole needs to be inspected from below and is usual behind waterpump pulley. If it's your heater core, you should smell anti freeze inside truck and in most cases windshield will fog up. Radiator could be pin hole to front side of radiator (which is buried behind AC condenser & grill) and if it was head gasket, intake manifold symptoms would be coolant in oil OR lots of white smoke from exhaust. Try parking it on a clean dry surface and see if you can narrow down area where leak is coming from.

Posted on Feb 25, 2011

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