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Tractor Talk Discussion Forum

Do I need a new thermostat???

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Mark

10-29-2003 11:04:53




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Hi all, winter is almost here so I decided to change the coolant in my MF 1085 because it hasn't been done in a few years and the heater was barely luke warm. So I drained the rad and block and I flushed them and the heater core out with clean water for about 10 minutes. After filling with new coolant (50/50 mix with H20) my heater is stone cold. The lower rad hose is extremely hot like it should be but the upper rad hose is cold to the touch, as well as the lines going to the heater. I am assuming i need a new t-stat but I'd like another opinion. Also, where is the t-stat located? I *think* it is just below the upper rad hose on the water pump, not sure. Thanks,
Mark

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Jake

10-29-2003 14:46:26




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 Re: Do I need a new thermostat??? in reply to Mark, 10-29-2003 11:04:53  
What is a MF 1085 ? A tractor with a cab?
Sounds like after your flush job that your heater is air locked (not circulating coolant through the hoses and core). Since I don't know exactly what you have I can't tell you how to bleed the air out and get the coolant circulating again. I had same problem on a JD tractor, heater was mounted in the top of the cab way above engine level. I had to run engine, disconnect hose from the heater core and keep running until coolant got hot and expanded and pushed it's way up through heater hoses and core, then reconnect hose after coolant started coming out and I had circulation agian. The water pump on the engine did not have enough to push coolant up through the heater hose to the core and purge the air back out the other line to the engine.

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Mark

10-29-2003 19:19:16




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 Re: Re: Do I need a new thermostat??? in reply to Jake, 10-29-2003 14:46:26  
Yeah, a MF 1085 has a heater core mounted at the top of the cab behind the radio. Sounds like the same problem perhaps. I'd say its about a 5-6 foot verticle push for the water pump...thanks for the input
Mark



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twopop

10-29-2003 12:02:04




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 Re: Do I need a new thermostat??? in reply to Mark, 10-29-2003 11:04:53  
do you have a working water temp guage in the dash.what is the temp.your discription sounds like a stuck thermostat.or an air lock.be sure your radiator is full.on some massey models it takes a long time to get the proper amount of coolant into them,and if your water level is very low your heater wont work.



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Mark

10-29-2003 12:51:54




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 Re: Re: Do I need a new thermostat??? in reply to twopop, 10-29-2003 12:02:04  
Hi, yes I have a temp guage, it seems to be working fine as it takes about 5 minutes to work its way up to operating temperature. It is the kind that just has a red-orange-green section, no actual temp indicators. The coolant temp sensor is near the t-stat housing right where the small coolant line exits to the heater. I pulled the hose and there is coolant present. Perhaps there is air like you say. There is what I *think* is an air bleeder there too but it is seized. I figured if I ran the motor for 5-10 mins with the rad cap off it would purge any air out. Picking up a new t-stat tomorrow anyway....Thanks

Mark

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Mark

10-29-2003 11:07:13




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 Re: Do I need a new thermostat??? in reply to Mark, 10-29-2003 11:04:53  
my mistake...the lower rad hose is cold as well. The hose coming from the water pump to the block is extremely hot, not the lower rad hose.

Mark



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RayP(MI)

10-29-2003 11:45:56




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 Re: Re: Do I need a new thermostat??? in reply to Mark, 10-29-2003 11:07:13  
Well, that's as it should be - hot into top of radiator - cold coming out. Not closely familiar with your particular model, although have driven father-in-law's a few hours. If heater is showing no heat at all, I would check water lines between engine and heater for obstructions, kinks, etc. Also check and see if the heater core is letting water through, it may have some obstructions too. Since you just changed coolant, is there a chance you have an air lock (bubble) in the heater line preventing coolant flow? Since hot water is flowing to radiator, probably thermostat is working. (But don't hold me to that.) If you choose to open up thermostat, I would probably replace, as they're pretty cheap, and that would end that worry - also saves going back in later. Usually the thermostat is placed just below (engine side) of upper radiator hose.

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Mark

10-29-2003 12:55:42




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 Re: Re: Re: Do I need a new thermostat??? in reply to RayP(MI), 10-29-2003 11:45:56  
Hi, I had the garden hose conected to the heater's inlet and ran it for 5 minuted at full stream. At 1st the water was sorta green/brown comming out the other hose but it was nice and clean after 20 seconds, but I still flushed it out for 5 minutes more. Seems to me like either a bad t-stat or air in the system as you say. Picking up a new t-stat tomorrow and then I'll know for sure :)

Thanks!

Mark

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kjm

10-29-2003 15:24:47




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 Re: Re: Re: Re: Do I need a new thermostat??? in reply to Mark, 10-29-2003 12:55:42  
If that stat doesn`t work unhook the cold heater hose after it warms up and let it run till hot water comes out(wouldn`t hurt to have someone pouring anti f in the rad at the same time)heater cores will air lock and they won`t work at all. kjm



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Mark

10-29-2003 19:25:56




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 Re: Re: Re: Re: Re: Do I need a new thermostat??? in reply to kjm, 10-29-2003 15:24:47  
I was having problems figuring out which hose was the inlet and which was the outlet (heat hoses). One enters the thermostat housing on the left of the tractor near the bottom of the housing, near where the lower rad hose connects. The other enters on the right near the top of the housing where the upper rad hose connects. I would think that the inlet for the heater hose would connect near the upper rad hose because that's where the coolant is exiting the engine therefore it would be hotter for the heater....but that's just my guess & I'm not sure.

Thanks, Mark

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