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  1. #1
    New Member
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    May 2012
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    Western NY
    Tractor
    JD 3320 with comfort cab

    Default Obtaining Heat Inside a 3320 Cab

    Bought a new cabbed 3320 at end of summer and I can't seem to get the heat on in the cab. This is the first time trying it in cold weather. Both the heat and cold knobs are turned as far as they go clockwise and I have the AC/deicing button pushed on..It is still blowing cold air. How long does it need to run before it begins blowing warm air?

  2. #2
    Veteran Member Dutch445's Avatar
    Join Date
    Aug 2001
    Posts
    2,237
    Location
    Upstate NY
    Tractor
    JD X585

    Default Re: Obtaining Heat Inside a 3320 Cab

    Has your temp gage come up to operating temp? There are 2 heater hoses on the right side of the engine compartment going up into
    the cab to the heater core, are they getting hot? you may want to try turning the A/C off and see if you get any heat. Also, check your
    coolant in the radiator (when cool) and see if it is full. If you get an air bubble in the system and it finds it's way up into your cab heater
    it will prevent the warm coolant from circulating up into the heater core in the cab. I can't remember for sure, but some tractors have
    a valve to shut that flow off going up into the cab (for summer), which would be visible from the right side of the tractor, between the engine and the
    bottom front of the cab where those hoses go into the cab and up to the heater core.
    JD X585 with 45 loader, 3ph, 62C deck, 47SB, 54 blade, Soft Cab. JD F620 with 60". JD HPX gator. JD T23 trimmer
    JD CS56 and CS36 saws. JS35 WB mower.

  3. #3
    Super Member Gary Fowler's Avatar
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    Jun 2008
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    7,838
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    Bismarck Arkansas
    Tractor
    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: Obtaining Heat Inside a 3320 Cab

    Turn off the ac by disengaging the AC button (light off) and just turn your temp control to hot. The heater should work then, at least that is how mine works.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  4. #4
    New Member
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    May 2012
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    23
    Location
    Western NY
    Tractor
    JD 3320 with comfort cab

    Default Re: Obtaining Heat Inside a 3320 Cab

    Quote Originally Posted by Dutch445 View Post
    Has your temp gage come up to operating temp? There are 2 heater hoses on the right side of the engine compartment going up into
    the cab to the heater core, are they getting hot? you may want to try turning the A/C off and see if you get any heat. Also, check your
    coolant in the radiator (when cool) and see if it is full. If you get an air bubble in the system and it finds it's way up into your cab heater
    it will prevent the warm coolant from circulating up into the heater core in the cab. I can't remember for sure, but some tractors have
    a valve to shut that flow off going up into the cab (for summer), which would be visible from the right side of the tractor, between the engine and the
    bottom front of the cab where those hoses go into the cab and up to the heater core.
    Just talked with dealer. Turned off AC switch and ran tractor at 1800 rpm for 20 minutes and still not blowing noticeable hot air. Even stainless lines not hot to touch. Dealer suspecting air got in and need to bleed off.

  5. #5
    Elite Member
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    Apr 2004
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    2,544
    Location
    East Coast of Lake Huron
    Tractor
    Deere, several

    Default Re: Obtaining Heat Inside a 3320 Cab

    Who connected the heater hoses and to where? We see dopes all the time that connect to just the block and head.

  6. #6
    Super Member greg_g's Avatar
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    Dec 2003
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    6,028
    Location
    Western Kentucky
    Tractor
    JD3720 Cab, 300X loader with 4-in-1 bucket

    Default Re: Obtaining Heat Inside a 3320 Cab

    Had a similar issue when my 3720 was new. Had to pop the top and adjust the temp control cables between the cab and the heat exchangers. What the knobs said - and what they were actually doing - was not the same thing. Also - what you're calling a deicer switch is actually just a compressor on/off switch. Its only purpose is to control whether you're cooling with A/C or with ambient air. It should be off when you want heat.

    //greg//
    USN (Ret)
    Former Chinese tractor owner (x4)
    Current John Deere owner

  7. #7
    New Member
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    May 2012
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    Location
    Western NY
    Tractor
    JD 3320 with comfort cab

    Default Re: Obtaining Heat Inside a 3320 Cab

    Is there a valve or switch somewhere that may be shut that would allow coolant not to enter the cab in the summer as was mentioned earlier? Looks as if one of the hoses running into the cab is warm on one side of the tractor and one running on the other side is cold.

  8. #8
    Super Member greg_g's Avatar
    Join Date
    Dec 2003
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    6,028
    Location
    Western Kentucky
    Tractor
    JD3720 Cab, 300X loader with 4-in-1 bucket

    Default Re: Obtaining Heat Inside a 3320 Cab

    That's what the cables do. As you turn either of those knobs inside the cab, they're supposed to open and close valves up under the cab cover. Sounds like your red knob isn't opening the heater core valve far enough - if at all. You have to take the roof off to adjust for proper cable travel. And don't try it yourself. Two guys have to lift the roof straight up, or else you'll tear the weather seal. I watched a John Deere mechanic try it himself, and they ended up buying me a new seal.

    //greg//
    USN (Ret)
    Former Chinese tractor owner (x4)
    Current John Deere owner

  9. #9
    Platinum Member
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    Jun 2009
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    679
    Location
    wyoming

    Default Re: Obtaining Heat Inside a 3320 Cab

    There is a rotary plastic shut off in the heater hoses as well. You will find it near where the hoses enter / exit the cab on the outside of the machine.

  10. #10
    New Member
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    May 2012
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    Location
    Western NY
    Tractor
    JD 3320 with comfort cab

    Default Re: Obtaining Heat Inside a 3320 Cab

    Quote Originally Posted by ctlguy View Post
    There is a rotary plastic shut off in the heater hoses as well. You will find it near where the hoses enter / exit the cab on the outside of the machine.
    We looked for a valve by tracing the hoses but dont see any. Dealer is supposed to be here within the hour. They think it is an air bubble in system and haven't mentioned anything about valves. So I will let you know what they figure out.

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