Radiator Cap same as Coolant Expansion Tank Cap?

Discussion in 'KJ General Discussion' started by sunrisew, Jan 20, 2020.

  1. sunrisew

    sunrisew New Member

    Messages:
    9
    Likes Received:
    2
    Joined:
    May 31, 2016
    Location:
    Los Angeles
    I noticed today I needed to top off my coolant in the expansion tank. I replaced the radiator last year (the previous owner had the wrong kind of coolant in it, and it all got trashed). I don't seem to have any leaks that are noticeable, but I did notice that the coolant expansion tank cap was barely tight at all when I removed it (engine a bit warm but not hot). So, I figured it would be an inexpensive and wise choice to replace the cap. However, the cap I have is not OEM, and I am having difficulty determining the part number--I have searched for just the cap, but I can only find choices for replacing the cap on the radiator (not the expansion tank) or replacing the entire expansion tank. Am I missing something here?

    2005 3.7L
     
    LibertyTC likes this.
  2. GitEmSteveDave

    GitEmSteveDave Full Access Member

    Messages:
    298
    Likes Received:
    51
    Joined:
    Feb 23, 2018
    Location:
    Howell
    I stole this from LibertyTC. Has the part number and make sure it's 16 PSI:
    [​IMG]
     
    sunrisew and LibertyTC like this.
  3. LibertyTC

    LibertyTC Well-Known Member Staff Member Moderator

    Messages:
    6,699
    Likes Received:
    228
    Joined:
    Oct 24, 2008
    Location:
    B.C. Canada
    Ya that was before I used brasso and made it better than new.
    In detailing section title was metal.polish, anyways part number is.
    05278697AA.
    I'll post a better pic later once I'm off the dumb phone.
    Also we have seen bad tanks.
    Pressure testing tank may also be required.
    If the tank is dirty inside or greatly discolored, you may want to get a new OEM tank and cap together.
     
    sunrisew likes this.
  4. sunrisew

    sunrisew New Member

    Messages:
    9
    Likes Received:
    2
    Joined:
    May 31, 2016
    Location:
    Los Angeles
    Thanks to all. Very helpful.
     
    LibertyTC likes this.
  5. LibertyTC

    LibertyTC Well-Known Member Staff Member Moderator

    Messages:
    6,699
    Likes Received:
    228
    Joined:
    Oct 24, 2008
    Location:
    B.C. Canada