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 12-31-2008, 10:38 Post: 158965
mathewb



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 Temperature problems

New Holland 1530 - I noticed that my temperature guage wasn't registering any normal temps. Barely moved off the bottom. So I checked everything out. All fluids at the correct levels - radiator cap looked normal. Called the dealer and asked their opinion.

They stated that I probably had a stuck thermostat which is what I figured too. So I replaced it with a new one. Drained and changed the coolant in this operation.

Now the guage will run up to the bottom of the green, then apparently the thermostat opens and it drops back to nothing.

Now what? I've never ran into anything like this before.






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 12-31-2008, 11:09 Post: 158966
candoarms



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MathewB,

It's not uncommon for a smaller tractor to have engine heating and cooling issues during the winter months.

Way up here in the frozen north, many of us place a piece of cardboard in front of the radiator during the winter months.

Remember that your tractor is designed to allow the radiator to cool your engine during even the hottest summer weather. During the winter months it is not necessary to allow for such extreme cooling efficiency.

You can either place a piece of cardboard in front of the radiator, or make a cold weather canvas cover front for your tractor. A canvas cover should have a flap with either snaps, or a zipper, allowing you to adjust it for proper air flow.

Insert a piece of cardboard in front of the radiator, and then KEEP A CLOSE EYE ON THE TEMP until you are sure you have it adjusted properly. If it gets hot, cut a hole in the cardboard. If it's still on the hot side, make the hole just a bit bigger.

I have two pieces of cardboard for my tractor. One has no openings cut in it at all. I use that one when the outdoor temps are in the -10 to -30 degree range. The other has a hole about the size of a softball cut out in the center. I use that one when the temps are anywhere from 0 - 25 above zero.

Works great. Just don't forget to watch the temperature gauge. It's a habit that takes a little getting used to.

Good luck.

Joel






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 12-31-2008, 11:24 Post: 158967
mathewb



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 Temperature problems

Thanks for the response. I've tried the cardboard and it's still not registering any heat. I'm wondering about the temp sensor now.

I would understand if it was just running cool, but the guage is going up to green and then dropping back to almost nothing.

But you're right, I haven't had a chance to run it in anything above 15 degrees for the past couple of weeks.






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 12-31-2008, 11:36 Post: 158968
Murf

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 Temperature problems

Get the engine thoroughly warm with the rad cap loose. Shut off the engine, open the rad cap and stick in a kitchen thermometer.

You should get a reading of about boiling point ideally, but realistically in this weather you will probably not get much more than 150 to 175.

If it is colder than 150 you need to do something to raise the temperature. The cardboard will work, but if it is not centered on the rad it can cause the fan to cavitate and flex to much. I prefer to see you just close off the front of the tractor grille, this will do a lot to limit the air through the rad, you want to reduce it, not stop it totally.

You may want to ask the parts guys at the dealer if there is a hotter thermostat you can get for that unit. Just don't forget to switch it back come summer time.A lot of the Japanese based units have such an efficient cooling system that you really have to work to warm them up.

Best of luck.






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 12-31-2008, 11:38 Post: 158969
candoarms



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Mathewb,

I'll try to explain things a bit better.

Your temperature gauge is fluctuating due to the thermostat opening and closing frequently. When the engine gets warm the thermostat opens, allowing coolant to flow through the radiator. The coolant then quickly cools off, causing the thermostat to close again.

Your temperature sensor is located beyond the thermostat. In other words, it won't read coolant temperatures when the thermostat is closed. You'll get a reading only when the thermostat opens again, because the thermostat is located in the cooling circuit, rather than in the engine block.

My little Kubota has a debris screen located just ahead of the radiator. It slips right out through the top allowing for easy removal of grass clippings, etc. I completely remove the debris screen during the winter, as there's no chance of anything of the sort plugging up my radiator during the winter months. I used the debris screen as a template to cut out a piece of cardboard that will slip right into the debris screen's channel.

Try it. I think you'll see a noticeable improvement.

One more thing..........

Diesel engines like to run a bit on the warm side. They don't operate efficiently in cold weather. Blocking off the air flow through the radiator is actually good for your diesel engine, provided you don't get it TOO hot.

Best of luck. Let us know how this works out for you.

Joel






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 12-31-2008, 11:45 Post: 158970
candoarms



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Murf,

Thank you, Sir.

I didn't see your message before posting my last one.

It is very important to cut the hole (if there is one) directly over the center of the fan hub. This will prevent any fan flexing problems.

My little Kubota has a nylon fan blade. There's little chance of it breaking due to metal working fatigue, as would be the case with a steel fan blade.......even so, the hole in the cardboard is cut directly over the center of the fan hub.

Joel






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 12-31-2008, 13:06 Post: 158971
Murf

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Joel, I'd be even more cautious of a nylon fan than steel, when the temperature drops a material that is very pliable at 70 F. can turn into an amazingly brittle product at sub-zero temps. In your area this may be a bigger issue than for most people.

I'd also be cautious about stopping air flow across the rad for another reason, clearing snow can be hard work, that hard work will make heat, and it needs to be dissipated, quickly, if you block off the grille rather than the radiator it will still allow cooling, but will keep the engine warmer.

Best of luck.






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 12-31-2008, 13:39 Post: 158972
candoarms



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Murf,

You're right about snow removal being hard work. It is very important to keep an eye on the temperature gauge when working the tractor hard in these temps.

Joel






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 01-02-2009, 08:06 Post: 159001
mathewb



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Thanks for the response guys. I'll give these ideas a try and see what happens. With these outside temps in years past, it would always run in the green on the guage, so since it won't this year, I'm still guessing that I've got something mechanically wrong.

Bruce






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 01-02-2009, 16:10 Post: 159007
auerbach



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I agree there's something wrong, likely the thermostat (wrong opening-temp or poor design). The cardboard-cover solution dates from the time before there were proper thermostats.






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