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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 Jerry/MT on March 01, 2009 at 16:23:11 from (206.183.116.129): In Reply to: John Deer 950 Over heating posted by Mark Kalisz on March 01, 2009 at 10:12:57: You say that the tractor is overheating and then you say that the radiator overflows just a few minutes after start up when you think the thermostat opens.It sounds like you may have two separate problems. Most of these tractors should not be filled with coolant to the radiator cap. They should be filled just above the top of the core to maybe a half inch over the core. The rest of the space is for the thermal expasion of the coolant. That maybe what you are seeing on start up. Overheating can have a lot of different causes. Make sure that you have the correct presure cap on the radiator, that your water pump drive belt is tight and that you have the correct thermostat and that it is working correctly. Make sure the lower hose does not collapse at high rpms. Finally, make sure the air filter is clean. Diesels are different than gas engines in that they run at varialble gas temperature (varable fuel to air ratios) and when you reduce the airflow with a dirty filter, it causes the gas temperatures to rise in the cylinders. That puts a higher heat load on the cooling system. You also want to make sure that there are no bubbles in the coolant with the engine running. That can cause the radiator to belch coolant out of the overflow and it"s usually caused by a head gasket leak. Replies: Re: John Deer 950 Over heating Mark Kalisz 18:02:22 03/01/09 (1) Re: John Deer 950 Over heating Jerry/MT 11:56:12 03/02/09 (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