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Modern Tractor Discussion Board Topic: Re: John Deer 950 Over heating [Show Entire Topic] [Return to Forum] Author [expand] [Modern View] Misterfixit 03-01-2009 12:32:40 66.157.56.89 20222 Report to Moderator 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. [Reply]  [No Email] Mark Kalisz 03-01-2009 13:39:49 68.32.83.163 20223 Report to Moderator I don't think that the water temp got above 180 degrees. It was just barely steaming and the water raised over the cap level. I was able to put my finger into it with out any discomfort. There was no bubbles or movement of water. Just the steady raising of the anti freeze level. Someone else had put a new thermostat in it and I am thinking that possible it was put in backwards or the radiator is plugged. Tomorrow I am planing on pulling the thermostat to see if there is any flow into the radiator. If there is I at least know the pump is working, Good idea???? If there's no flow then I suspect the water pump or radiator is plugged but that's just my laymems opinion. Trying to do a process of elimination before tearing into something I don't need to. Thanks for your reply and hopefully you know where I am going with this.   [Reply]  [No Email] [Show Entire Topic]   [Options]  [Printer Friendly]  [Return to Forum]   [Add a Reply] Hop to: Another Forum Tractor Talk Tool Talk Restoration Tips Paint & Bodywork Implement Alley Tractor Transporting Allis Chalmers Case Combines Crawlers Farmall & IH Ford Ford 9N,2N & 8N Fordson John Deere MH & MF Harry Ferguson Minneapolis Moline Oliver & Cockshutt Garden Tractors Orphans Stationary Engines Today's Tractors Memorabilia Tractor Tales Using Your Tractor Tractor Pulling Site Comments Test Forum Buyer Seller Feedback Kountry Life Classic Trucks