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Ranger 700xp overheating

This is a discussion on Ranger 700xp overheating within the Ranger Problems & Solutions forums, part of the Polaris Ranger Forums category; Have recurring problem of overheating with the flashing notification. The fan is running, but the coolant is cool and not circulating when I take off ...

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Thread: Ranger 700xp overheating

  1. #1
    Starting Member rdfarr's Avatar
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    Question Ranger 700xp overheating

    Have recurring problem of overheating with the flashing notification.
    The fan is running, but the coolant is cool and not circulating when I take off the radiator cap. It's also topped off.
    What could be the problem? Thermostat?
    Thinking of removing the thermostat for the summer.

  2. #2
    Regular Member miker570's Avatar
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    Ranger 700xp overheating

    Yes I would take the thermostat out as a test and/or replace it.
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  3. #3
    (Kris) 1000+ Member jungleman's Avatar
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    rd, NEVER run an engine without a thermostat. An EFI engine needs to be up to temp to work properly. You could have a plugged radiator or a bad pump impellar or a big air pocket . Although minutely possible that the stat is bad, not very likely . Carefully remove the stat and remove the rubber gasket and drop the stat into a pan of boiling water and check for it to open. Not that it would keep the coolant from circulating but when did you last install a new cap ? They go bad every few years and then boil over begins.
    pyromedic likes this.
    Life's journey is not to arrive at the grave safely in a well preserved body,but rather to skid in sideways totally worn out shouting WHAT A RUSH, WHAT A RIDE. WHOA !

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  5. #4
    Veteran Member summermn's Avatar
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    Quote Originally Posted by jungleman View Post
    rd, NEVER run an engine without a thermostat. An EFI engine needs to be up to temp to work properly. You could have a plugged radiator or a bad pump impeller or a big air pocket . Although minutely possible that the stat is bad, not very likely . Carefully remove the stat and remove the rubber gasket and drop the stat into a pan of boiling water and check for it to open. Not that it would keep the coolant from circulating but when did you last install a new cap ? They go bad every few years and then boil over begins.
    Jungle, he has cool coolant and no boil over. Your right about almost all newer ecm controlled engines have block sensors and now exhaust sensors to control fuel flows and help with keeping emissions low.
    I would remove and test the thermostat. Its simple, and the cost is zero.
    Last edited by summermn; 06-11-2019 at 06:40 PM.
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  6. #5
    (Kris) 1000+ Member jungleman's Avatar
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    Yeah sum , I got that. I covered the usually non circulating bs............. air pocket/ bad impellar/plugged radiator stuff and then started on the cap spiel. My point is/was that I have worked on dozens of 700's that have overheated and I NEVER ONCE had a bad thermostat when there was no circulation. Not one.
    summermn and Rangerwhit like this.
    Life's journey is not to arrive at the grave safely in a well preserved body,but rather to skid in sideways totally worn out shouting WHAT A RUSH, WHAT A RIDE. WHOA !

    2007 Polaris Ranger700 XP LE

  7. #6
    (Steve) 1000+ Member pyromedic's Avatar
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    Don't know about the 700 Polaris engine but some engines run hot when there is no thermostat becaue the coolant passes through the radiator too quickly to shed heat. Ford 289 was bad about that.
    jungleman likes this.
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  8. #7
    (Kris) 1000+ Member jungleman's Avatar
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    Pyro, With the 700 engine with two little cylinders you end up with a oil pan full of gas because it never warms up enough to burn it off. A V-8 will get hot like you said because , like you said, the coolant passes thru to fast and doesn't cool.
    pyromedic likes this.
    Life's journey is not to arrive at the grave safely in a well preserved body,but rather to skid in sideways totally worn out shouting WHAT A RUSH, WHAT A RIDE. WHOA !

    2007 Polaris Ranger700 XP LE

  9. #8
    1000+ Member Rangerwhit's Avatar
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    Easy to test with the radiator cap off. Remove thermostat and get the air out if any. Circulation check.
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    2007 Ranger 500 (Carb)

  10. #9
    1000+ Member Rangerwhit's Avatar
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    Quote Originally Posted by jungleman View Post
    Yeah sum , I got that. I covered the usually non circulating bs............. air pocket/ bad impellar/plugged radiator stuff and then started on the cap spiel. My point is/was that I have worked on dozens of 700's that have overheated and I NEVER ONCE had a bad thermostat when there was no circulation. Not one.
    Plugged radiator not the symptoms. Maga!
    2007 Ranger 500 (Carb)

  11. #10
    (Steve) 1000+ Member pyromedic's Avatar
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    Quote Originally Posted by Rangerwhit View Post
    Plugged radiator not the symptoms. Maga!
    MAGA????? You switching sides Ranger?
    Rangerwhit likes this.
    2015 Polaris Ranger 570 Full Size XP
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