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  1. #1
    Silver Member VT_Hokie's Avatar
    Join Date
    Jun 2005
    Posts
    107
    Location
    Blacksburg, Virginia
    Tractor
    Yanmar 1500D, Kubota L5030

    Default Down hill hot, up hill cold?

    I have a 1500D with no water pump ie thermo siphon and I have installed a temp gauge after I realized that my idiot light was not working. When I run the tractor under heavy load at full throttle (bushhog, dragging boxblade) that the temp will run up to 220 max going down a hill (70F outside temp). But under the same load going up hill the temp will drop down to 185-190. Is this normal? I was thinking that the warmer coolant was pooling at the back/top of the engine going down hill and the cooler fluid comming into contact with probe while going up hill. Some have posted that operational range is 180 to 190. Should I be worried?? Other specifics:

    35% antifreeze to water.

    Front mesh is cleaned out.

    Radiator had not been rodded, but does not look corroded.

    System has been flushed.

    No exhaust gas residue or bubbles in coolant.

    No coolant in oil.

    Does not use coolant as far as I can tell.

    Thanks for any input!

    VT

  2. #2
    Veteran Member
    Join Date
    Apr 2000
    Posts
    1,572
    Location
    Dixon, Il

    Default Re: Down hill hot, up hill cold?

    I wouldn't worry.

  3. #3
    Member
    Join Date
    May 2002
    Posts
    46
    Location
    Western NC Mountains
    Tractor
    Kubota B1700 HST Bi-Speed Turn

    Default Re: Down hill hot, up hill cold?

    My 1100D with the same thermo syphon does the same thing.

    Just a quirk of this style cooling system.

  4. #4
    Silver Member VT_Hokie's Avatar
    Join Date
    Jun 2005
    Posts
    107
    Location
    Blacksburg, Virginia
    Tractor
    Yanmar 1500D, Kubota L5030

    Default Re: Down hill hot, up hill cold?

    Thanks for the information. Since I have some steep slopes on my property and prefer to bushhog some of it in reverse or going foward down slope, it gets a little unnerving to see that temp gauge swinging on the hot side. May need to come up with some kind of solution so that it does not boil over this summer...

  5. #5
    Veteran Member
    Join Date
    Feb 2005
    Posts
    1,467
    Location
    Olathe, Ks
    Tractor
    Yanmar 1602D

    Default Re: Down hill hot, up hill cold?

    Do they offer water pump kits for the 1500 like they do the 1700? Lots of folks have added water pumps to their 1700s with good results........

  6. #6
    Veteran Member
    Join Date
    Apr 2002
    Posts
    2,086
    Location
    SW Ohio
    Tractor
    yanmar

    Default Re: Down hill hot, up hill cold?

    Quote Originally Posted by Jagmandave
    Do they offer water pump kits for the 1500 like they do the 1700? Lots of folks have added water pumps to their 1700s with good results........
    Never seen one. What allows that on a 1700 is that it is the same block as the 2000, so parts fit. It would take a complete retrofit for a 1500 and I'm not aware of anyone doing that.

  7. #7
    Elite Member
    Join Date
    Mar 2002
    Posts
    3,399

    Default Re: Down hill hot, up hill cold?

    Since so many guys do run thermosyphon systems in the 180-190 range I suspect you still have some blockage. I would "back flush" the system until water runs clear, and if no help, have the radiator professionally tested/cleaned.

  8. #8
    Elite Member
    Join Date
    Nov 2005
    Posts
    2,915
    Location
    Virginia
    Tractor
    1949 farmall, 1961 Fordson Dexta, 1986 Duetz Allis, 2001 Kubota.

    Default Re: Down hill hot, up hill cold?

    Sounds like an old MGB that I use to own... only burned oil driving south? North, East or West ran like a top! Never could figure it out?

    mark
    red tractor
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    too many impliments to list

  9. #9
    Platinum Member Tom_Veatch's Avatar
    Join Date
    Oct 2003
    Posts
    516
    Location
    Wichita, Kansas
    Tractor
    Yanmar 2220D

    Default Re: Down hill hot, up hill cold?

    Quote Originally Posted by mjarrels
    Sounds like an old MGB that I use to own... only burned oil driving south? North, East or West ran like a top! Never could figure it out?

    mark
    Probably had one of those magnetic oil pan drain plugs and it was interacting with the Earth's magnetic field.
    Tom Veatch
    Wichita, KS
    USA

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