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Old 3 Weeks Ago
eksjay  eksjay is offline
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Default Radiator Caps

Could anyone please tell me what is the difference between a Tridon Radiator Cap that is stamped 16/110 versus 20/135?

I am currently using a 20/135 on a Mopar radiator [it did not come with this radiator] and I am having all of my coolant and most likely water, spray in the surrounding area of the filler cap. I have only had this cap for about 1 year.

I have recently purchased a 16/110 from Ebay and I am wondering if this is more suitable?

The car is a Pre Update 4.0L I6.

Many thanks to you in advance....

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cap pressure in psi/kpa
i belive 16 is stock.
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Thanks Rainman ... so if I have a cap that is rated higher, does this mean that the coolant won't go back into the reservoir properly .... i.e. I will have a loss over a period of time?

This is what has happened with the 20/135 ... I have had spluttering over the immediate area.... the Mopar radiator is only about 2 yo, if that...
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well regardless of pressure it should go from the radator to the reserve bottle. should not leak. i have a cable tie around where the overflow hose attaches to the nipple on the radator.
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16psi is the standard recommendation .
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I fitted a 16psi Tridon cap, due to slight coolant loss, and evidence of foaming, looked alright, but new one fixed the problem.

The Jeep rad caps seem to be somewhat tight, compared to other vehicles?, maybe the rubber sealing ring can get abraded using so much force?,,, I checked my rad neck for any imperfections
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Ive got a 16psi Stant Lever Vent rad cap on my 95 XJ. Never had a problem with it. I use it so i can test the pressure in my system. They are cheap to buy and work well.



At the end of the hose that goes into your overflow bottle, i put in an old bicycle tube valve. I then put a bike pump that has a gauge on it, and pump the system up while the Lever on the rad cap is open. I can then check for leaks by watching to see if the pressure goes down, or using one of those uv blue light torches that are a dollar on ebay. The light makes the coolant glow.

https://www.summitracing.com/int/par...okee/year/1995

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That's a nifty setup Alex.
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