kattywumpus
Gold Member
Anyone know what the thermostat part number is for DK40SE? Is this something I can get at NAPA? No cab heat looks like the thermostat stuck open.
Replacement Thermostat for DK40SE
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k0ua
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murphy1244
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thermostat#E5800-73011 gasket#E5500-73272 Feel the top hose to see if coolant is get thru. Does the temp gauge go up?
OP
kattywumpus
Gold Member
Yes, the temp gauge does go up after several minutes. My guess is the engine reaches operating temperature after 20 or 30 minutes, but no hot coolant is getting to the cab heater.
k0ua
Epic Contributor
is it possible you have an air bubble in the heater hoses?..
murphy1244
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How does one get a air bubble out of a heater hose? I've done lots of car work and have never run into this. Is this a tractor thing?
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kattywumpus
Gold Member
Anything possible. I did think of that but since the engine normally doesn't take long to reach operating temperature and its a lot easier to change the thermostat then open the cab roof I figured I try changing the thermostat first.
k0ua
Epic Contributor
I have seen several posts on this. I suppose kinda like vapor lock.. apparently it can happen. I will see what I can find.
k0ua
Epic Contributor
here is one.. it is a John Deere, but I suppose it could happen to a Kioti.. seems the air bubble gets trapped up in the heater core and stays there.
http://www.tractorbynet.com/forums/.../265483-obtaining-heat-inside-3320-cab-2.html
http://www.tractorbynet.com/forums/.../265483-obtaining-heat-inside-3320-cab-2.html
murphy1244
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Now I got it, Cause the heater core is mounted so high up the water pump must have a hard time moving it. Where as a car its like 6 inches higher than the pump. Am always learning. katty, have you been in the cooling system lately?
murphy1244
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My gosh we posted at the same time again, we must stop doing this.
seacap04
Gold Member
If the engine reaches normal temp than thermosat is more than likely doing its thing. I have had the same issue with heaters I have installed in boats run off engine cooling system. I now install vents, (usually a tee with a small valve), at the high point of the system. After reading a couple of posts about cab tractors I take it manufacters save a buck or two by not installing vents.
Hard Knocks
Bronze Member
Correct, if the engine is reaching operating temp the thermostat is not your issue. You have an air lock. The cab models are a pain to bleed the upper hoses after doing any service to the cooling system. You know that you have got all of the air out when you get heat in the cab.
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kattywumpus
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I got the cab heat working just before the next big snowstorm. The problem was not an air bubble or the thermostat, it was a bent cable. Lucky before I touch the thermostat I timed how long it took for the engine to reach operating temperature in the morning. With outside temperature 18 degree the engine reach operating temperature in less then 5 minute so I decide the thermostat was fine, good choice. It took me about 30 minute to pop the top of the cab, not too bad for the first time. After looking over the heater setup I noticed the shutoff valve for the heater in the off position even through the heat control dial was turn all the way to high heat. After look over the heater control linkage I found the bent cable at the cab heat control dial.
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kattywumpus
Gold Member
It appears the reason the cable bent is if the heat is turned all the way to cold it caused the heater shutoff valve lever pass the shutoff position or pass perpendicular to the hose. When the dial is turned to cold the cable is pulled, so when the dial is turned to heat the cable is pushed. When heater shutoff valve lever pass perpendicular it takes more force on cable and heater levers to move the shutoff valve back to the on or heat position. Over time this weaken the cable at the dial end until it finally bent. I came to this theory after straightening the cable and operating the heat/cold dial back and forth between cold and heat. If the heater shutoff valve lever got push passed perpendicular when turned to cold when I attempted to turn the dial to heat the cable bent. I ended up adjusting the cable a little and adding a stop at the heater shutoff valve to prevent it from going pass perpendicular. This appear to resolve the issue.
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k0ua
Epic Contributor
Glad you got it fixed, and thanks for posting back and educating us!
James K0UA
James K0UA
seacap04
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Every problem we find and the solution to fix it really helps make this a good forum. Glad you got it fixed and thanks for posting.
murphy1244
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Good job
Coyote machine
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Nice work troubleshooting! I was about to ask you if the heat had ever worked properly since you had ther tractor when you came up with the fix.
Did you show where the extra stop you installed is in the pics? I couldn´t find it...
Is it possible that the cable which bent is the wrong cable, (too long) for the application?
Thanks,
CM
Did you show where the extra stop you installed is in the pics? I couldn´t find it...
Is it possible that the cable which bent is the wrong cable, (too long) for the application?
Thanks,
CM
OP
kattywumpus
Gold Member
In my hurry to close the cab before dark I forgot to get a picture of the stop. I had do the work outside due to the height need to open the cab top. As far as the cable length I don't know. If the cable was stiffer at the dial end I don't think pushing passed perpendicular on the valve would be an issue. If the issue occurred again I would remove the cable and solder or braze an inch or so of the cable to stiffen it up. I would use a vise-grip as an heat-sink just before the cable housing to prevent it from melting.
