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Does 16 psi radiator cap harm the engine

Discussion in 'Stock 2006 -2010 Explorers' started by alawneh, December 5, 2017.

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    1. alawneh

      alawneh New Member

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      Hello everyone, as the title of this thread i wanna know if i change the 20 psi rad cap with16 psi may this affect or harm the engine or not!!!?
      Last week i changed the rad cap becouse i felt that 20 psi built alot of pressure so the large main hose very hard to sequeez and there is no 20 psi cap at the dealership.
      2010 explorer 4wd about 164k mi.
      Thanks
       
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    3. garye

      garye New Member

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      I don't think so, I have been running one of over a year no problems.
      2008 4.0
       
    4. alawneh

      alawneh New Member

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      Thanks alot for your great response.
       
    5. Davidm53

      Davidm53 Active Member

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      Same here, 16 PSI cap for several years now.
       
    6. shucker1

      shucker1 Elite Explorer

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      It will lower your boiling point of the coolant slightly.

      I think for every PSI pressure you apply you raise the boiling temp by 3 Degrees?

      Therefore you have just lowered your boil over temp by 12 degrees.

      If you keep the coolant changed on a regular basis there should not be an issue.
       
    7. alawneh

      alawneh New Member

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      Thank you Davidm53 and shucker1 for response. Until now i havnt any issue just releif some hoses pressure.
       
    8. alawneh

      alawneh New Member

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      Dear shucker1let me understand that,which better lowering or raising the boiling point??
       
    9. shucker1

      shucker1 Elite Explorer

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      You defiantly don't want to go higher.

      The system was designed for 20 PSI.

      You run the risk of blowing things up.

      Unless you live and drive in the desert most of the time I don't see where lowering the pressure cap wold hurt.
       
    10. alawneh

      alawneh New Member

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      Thanks again. So the lower pressure cap means lower boiling point and allow water to move faster from engine to the container.
       
    11. shucker1

      shucker1 Elite Explorer

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      In essence, yes.
       
    12. 08Ex

      08Ex New Member

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      I changed my cap on my 08 Ex to the 16psi cap in 2009 because of all the radiator and thermostat housing issues I've seen on the forums. I now have 98K miles on the odo and haven't had any leak issues.
       
    13. MotorCityFats13

      MotorCityFats13 Active Member

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      the 20psi/16psi swap is one of the first things people do because 20psi is too much for those cheap plastic t-stat housings and plastic radiator end caps...... on mine before and after the swap my coolant stays stable at 192F winter and 194F summer which is normal for a 192F t-stat and the cap pressure will not change it..... so you basically did what others do but without reading it on a forum thread so I will award you with intuition 50 points lol
       
    14. alawneh

      alawneh New Member

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      Thanks alot for your post, i am wondring why i didnt change it before.
       

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    15. alawneh

      alawneh New Member

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      Thanks for the points, it took from me alot of time and changing parts until i swap to 16 psi rad cap,so it was intuition and trail and error expirements..

      Thanks again
       
    16. michael loibl

      michael loibl Active Member

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      If one more plastic coolant part springs a leak on my “4.OH NO”, I’m going to begin a search for an even lower psi cap than my current 16
       
    17. MotorCityFats13

      MotorCityFats13 Active Member

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      I did the through bolt and nut hack on mine and it's holding up great but the 3 bolts holding it to the manifold like to loosen up and I have to keep checking them when ever my coolant starts looking low.... but it did come from a salvaged 3rd gen and they say those crush sleeves don't like being reused but....... screw those engineers
       

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