Engine Cooling System Driving Me Crazy

Discussion in 'Fox 5.0 Mustang Tech' started by jcgafford, Sep 10, 2012.


  1. jcgafford

    jcgafford Well-Known Member

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    Either it is working right and i am losing my mind or it is the water pump. When your car is up to operating temp is the upper radiator hose under pressure and what would happen if you took the radiator cap off? On mine it is never under pressure and i can take the cap off any time without spilling a drop. I even bought a new cap and used that... same thing. you can run it for hours and it never overheats and never fills the overflow. i did pressure check the cooling system a while back before i got it running and it held pressure fine. someone enlighten me before i rip off this water pump!
    #1
  2. 95Vert383AOD

    95Vert383AOD Active Member

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    Do you have a thermostat in there?
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  3. jcgafford

    jcgafford Well-Known Member

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    did. 192 degree, the oem t-stat. took it out just to satisfy my curiosity today. it is going back in. either way though it never pressurizes the hose.
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  4. 95Vert383AOD

    95Vert383AOD Active Member

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    I personally like the 180 degree. You should be running one.

    There aren't any leaks? Is it overheating? Have you checked your fan clutch?
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  5. jcgafford

    jcgafford Well-Known Member

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    no leaks i see, NEVER overheats, fan clutch??? if the fan is turning it should be all working, my fan is turning.
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  6. jcgafford

    jcgafford Well-Known Member

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    it has to be the water pump. i just went out and started my explorer and within 10 seconds with the cap off it wants to shoot coolant everywhere. damn it...
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  7. 95Vert383AOD

    95Vert383AOD Active Member

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    maybe but its odd that its not overheating.
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  8. jcgafford

    jcgafford Well-Known Member

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    i am going to go through the whole thing again this saturday. pressure test system and cap. replace t-stat. and last replace pump. i actually did a block test a few weeks ago because i was worried about a head gasket leak, turned out to be fine. i will just repeat all the others again but i see myself ripping the pump out...
    #8
  9. 95Vert383AOD

    95Vert383AOD Active Member

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    well if its pretty old it wouldn't hurt. They are pretty cheap.
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  10. Bullitt95

    Bullitt95 Active Member

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    If your water pump isn't leaking and your engine doesn't overheat, you don't have a problem. At worst maybe your radiator cap isn't holding enough pressure. Even though it's new it might not be the right one for you, especially if you have an aftermarket radiator and the filler neck is slightly taller than on the OEM radiator.
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  11. jcgafford

    jcgafford Well-Known Member

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    tested both caps last night. they both failed... one was the original, other was a stant and was brand new. bought a new stant cap and will re-install the thermostat and new cap today.
    #11
  12. jcgafford

    jcgafford Well-Known Member

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    after all that it was the cap. the "new" one failed pressure testing as bad as the old one. new cap and now no problems. guess "new" doesnt mean good.
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  13. gearheadboy

    gearheadboy Mod Dude

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    Been there many times..REALLY sux when you are a one man garage and you waste most of your day losing profit because of a bad NEW part. I question the NEW PART the second my problem isn't fixed.
    #13
  14. jcgafford

    jcgafford Well-Known Member

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    Turns out it was more than a bad cap. the timing chain cover to water pump gasket was junk. changed that out this past summer and the hose is pressurised. Cooling system runs as it should. fyi that upper hose is supposed to hold pressure. if yours doesn't then there is a problem somewhere.
    #14
  15. mikestang63

    mikestang63 Mustang Master

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    Did you ever pressure test the system? That should have exposed the leak in the gasket. Glad you had the problem resolved.
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  16. jcgafford

    jcgafford Well-Known Member

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    Three times. Finally read he directions and did it correctly the third time. ****ed coolant out the driver side front of the engine. half a day of work and new water pump bolts and it is finally back to proper working order.
    #16

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