Poor cab heat

[Cidertom]

Couple of ideas:
Mow a patch of thistle that has gone to seed. This plugs up the side screens, the radiator screen, the radiator and your lungs. I could not keep the front clean enough on the 4520 to keep the engine heat at "reasonable". It sort of looked like I was mowing in a snow storm.

Slightly more practical:
On a radar site I was on, we had a "coat" built of canvas for the tug tractor we used to move shelters. Covered all of the hood. Otherwise it never would heat up enough to run well. An awning shop should be able to come up with a green blanket to keep the deere warm.

 

[Willl]

When they tested the thermostat in "hot" water, was a thermometer used to tell exactly the temp it did open at ?
Guessing won't do.

Is the heater hose tapped into the system just before the thermostat like most cars/trucks ?

 

[Chris_VA]

Just came across this post and thought I'd chime in since I have a 3720 cab. Now keep in mind I haven't used the heat since last winter, but when I did, it worked fine. It would run me out of the cab on anything but low fan and the mid setting on the temp control. I only have to run the A/C at night to minimize fogging. During the day, I don't have a problem. Even with the A/C on, I don't have to adjust the heat temp. It just flat heats. Cools good in the summer also. I'm interested in the comments about this being a known issue with Deere. Lets hope not but please keep us informed of the process.

Thanks,
Chris

 

[radman1]

When they tested the thermostat in "hot" water, was a thermometer used to tell exactly the temp it did open at ?
Guessing won't do.

Is the heater hose tapped into the system just before the thermostat like most cars/trucks ?

Yes, he said he checked it with a thermometer. He said the thermostat opened/closed at 154-156F. I don't think the thermostat is the issue since JD tech support acknowledges this is a problem and engineers are trying to get a fix on it. JD tech support told them, the engine was designed to put out much more hp than want it is set up for. The cooling system was designed on more maximum hp. The radiator just seems to large for the small engine.
The heater hose comes directly off of the water pump like a car. After circulating through the cab heater, it returns to bottom radiator hose on the right side.
Local dealer also checked the relay/shutoff control in the cab heater and it is working properly. It seems as though all the bases have been cover by my dealer. Service manager called area rep today. Rep said if Jd support doesn't call back by monday am, he will call and try to get some answers. Jd support was suppose to call back today.

 

[radman1]

Just came across this post and thought I'd chime in since I have a 3720 cab. Now keep in mind I haven't used the heat since last winter, but when I did, it worked fine. It would run me out of the cab on anything but low fan and the mid setting on the temp control. I only have to run the A/C at night to minimize fogging. During the day, I don't have a problem. Even with the A/C on, I don't have to adjust the heat temp. It just flat heats. Cools good in the summer also. I'm interested in the comments about this being a known issue with Deere. Lets hope not but please keep us informed of the process.

Thanks,
Chris

That is the puzzling part to me. Why does this seem to be a problem now when others claim to have no problem on older cab tractors which have been used in the previous winter? I have to wonder if JD made some changes to the cooling system. I also wonder if the noncab 3000 and 4000 twenty series have the same problem but it is not noticed by the owners since cab heat is not needed. I would have to guess that the same radiator and cooling system is used in all the them regardless of cab or no cab.

 

[radman1]

Brought tractor home tonight. After 5 days at the dealer, I have a nice new piece of cardboard in front of the radiator and still no cab heat. I don't blame the dealer. Dealer was initially a little slow to acknowledge a problem but now has been very upfront and has checked out nearly all reasonable possibilities. (After a little prodding from me ). I'm not a mechanic but have been around farming and tractors most of my life and I know a skunk when I smell one. Now up to JD corp to get a solution.
I remember many years ago, using a can of gravel filled with a little kerosene and lit to make heat in the winter on our combine cab. Hope JD corp doesn't read this part to come up with a similar solution.

 

[dirtworksequip]

radman,it is supposed to get down in the 30's this weekend. I'll make it a special point to try out the heater on my 3520. Whats the serial number on your tractor?

 

[radman1]

radman,it is supposed to get down in the 30's this weekend. I'll make it a special point to try out the heater on my 3520. Whats the serial number on your tractor?

LV3720H281500

Radman1

 

[minimax]

The serial number on mine is LV3720H281451 and the heat works great????

minimax

 

[radman1]

The serial number on mine is LV3720H281451 and the heat works great????

minimax

Where are you located? Have you tried the cab heat when it was cool/cold outside? Your serial number is very close to mine.