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Modern Tractor Discussion Board Re: John Deer 950 Over heating [ Expand ] [ View Replies ] [ Add a Reply ] [ Return to Forum ] Posted by Misterfixit on March 01, 2009 at 12:32:40 from (66.157.56.89): In Reply to: John Deer 950 Over heating posted by Mark Kalisz on March 01, 2009 at 10:12:57: When you say it overheats, are you going by the temp guage, that it boils past the radiator cap, or both? A stuck closed thermostat can cause what you're observing, but I don't know that it should within 5 minutes idling at 15 degrees ambient. Not knowing the specifics on that particular Yanmar, I'd guess around 180 would be stock thermostat temp. So yeah, from 15 degrees to boiling over in 5 minutes seems a bit quick. Are you seeing any bubbles in the coolant when it starts to surge upward? At those temps I hope you have at least about a 30% mix of antifreeze/coolant in there. You may have combustion pressure getting into the cooling system somewhere (cracked block, head gasket etc). Verify whether its a pressure issue, or a heat + pressure issue first. Replies: Re: John Deer 950 Over heating Mark Kalisz 13:39:49 03/01/09 (0) Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Optional Video Title: Optional Video URL: Advanced Posting Options Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.   Advanced Posting Tools   Upload Photo  Select Gallery Photo  Return to Post