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overheats uphill and cools down really fast...

Discussion in 'Technical Chat' started by bullcrew, Mar 28, 2015.

  1. Mar 28, 2015 at 6:24 AM
    #1
    bullcrew

    #1
    bullcrew [OP] Well-Known Member

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    OK so it has a aftermarket radiator and fan as well as hydro assist cooler, Tranny cooler and ac in front of the regular radiator.
    So it is fine all around its fine with air conditioning g going it runs fine in 90 degree heat...

    If I go up a really steep hill that's really long as in the 330 to big bear 600 feet to 7000 feet in a short period of time it overheats......

    Anywhere else its great...

    Now here's the kicker......

    It goes from the red to back to half in 2 minutes...I stop turn it off and let it sit for a minute or two start it up and it drops back to half or so and takes a bit to go back to red on a steep hill...

    So turned heater in full blast and the heater got super hot but ran it to try and eliminate any air pockets...the radiator was full and the reservoir was down....

    Oil isn't milky coolant is Toyota brand .....
     
    bullcrew, Mar 28, 2015
    #1
  2. Mar 28, 2015 at 6:39 AM
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    Steves104x4

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    Steves104x4 Well-Known Member

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    Is there a fan shroud on the radiator? Electric fan?
     
    Steves104x4, Mar 28, 2015
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  3. Mar 28, 2015 at 9:35 AM
    #3
    bullcrew

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    bullcrew [OP] Well-Known Member

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    Yes...it has a full aluminum shroud and it pulls a lot of air....electric fan and I have a switch for it....it was on the whole time
     
    bullcrew, Mar 28, 2015
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  4. Mar 28, 2015 at 9:57 AM
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    robssol

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    robssol If it ain't broke, leave it the eff alone!

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    Is the fan turning the right direction?
    BTW never shut down a overheated motor. Let it idle.
     
    robssol, Mar 28, 2015
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  5. Mar 28, 2015 at 10:07 AM
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    STravis

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    STravis Well-Known Member

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    Could your thermostat possibly be stuck?
     
    STravis, Mar 28, 2015
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  6. Mar 28, 2015 at 2:14 PM
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    bullcrew

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    bullcrew [OP] Well-Known Member

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    Yeah it hits red I turn it off no steam or loss at all....then let it sit for 2 to 3 minutes and its half or close to again....I know there's no way the block is cooling that fast makes me think there's a circulation issue...or possibly a air pocket near the temp sensor......

    If thermostat was stuck it would be hot more regular.....it never leaves half even sitting in traffic...its actually a smidge over half and that's where its happy till a really steep long Incline
     
    bullcrew, Mar 28, 2015
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  7. Mar 28, 2015 at 2:16 PM
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    95 taco

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    Do you have a scanguage or ultraguage to measure the actual temperature of the coolant?
     
    95 taco, Mar 28, 2015
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  8. Mar 28, 2015 at 3:36 PM
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    bullcrew

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    bullcrew [OP] Well-Known Member

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    I don't but that would be a good idea to see if in fact the rest of the system is that hot....I have one at the shop on the Xj I can snag.

    Aside of that though any ideas or why it cools so fast....
     
    bullcrew, Mar 28, 2015
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  9. Mar 28, 2015 at 4:13 PM
    #9
    STravis

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    STravis Well-Known Member

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    Maybe the engine circulates the water too quickly on climbs because you are at a higher rpm climbing hills? That's the only reason I would still assume thermostat.
     
    STravis, Mar 28, 2015
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  10. Mar 28, 2015 at 4:33 PM
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    lotsoftoys

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    lotsoftoys pavement is boring....

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    bunch of crap
    3.4 or 4banger?
     
    lotsoftoys, Mar 28, 2015
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  11. Mar 28, 2015 at 4:46 PM
    #11
    bullcrew

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    bullcrew [OP] Well-Known Member

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    bullcrew, Mar 28, 2015
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  12. Mar 29, 2015 at 5:42 PM
    #12
    lotsoftoys

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    lotsoftoys pavement is boring....

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    bunch of crap
    You said the coolant level continues to go down?
     
    lotsoftoys, Mar 29, 2015
    #12

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