dk55 ac questions

[8404]

Anyone know if there is a filter or something that needs cleaned on the AC system of a Kioti tractor?? My AC keeps freezing up and stops blowing cold air. How can someone clean out the water drains on these AC unit.? it seems to dain in more than just the designed drain tube so it seems like it might be stoped up somehow

 

[arsenix2001]

Anyone know if there is a filter or something that needs cleaned on the AC system of a Kioti tractor?? My AC keeps freezing up and stops blowing cold air. How can someone clean out the water drains on these AC unit.? it seems to dain in more than just the designed drain tube so it seems like it might be stoped up somehow

Thats typically a sign that you are running low on freon. I would check for leaks.

 

[8404]

ok ill get it checked for leaks. i didnt think it would freez up when it is low of freeon

 

[arsenix2001]

ok ill get it checked for leaks. i didnt think it would freez up when it is low of freeon

Lack of charge is a typical cause of evaporator coils freezing up, but as you mentioned it can be restricted airflow as well, make sure it is clean. Check any filters. While its functioning correctly check the compressor cycle times, if its short cycling, another indicator of a low charge. If you have guages give it a looksie. Refrigerant dye and a uv light will help u spot a leak if its low for no reason, but at that point you might as well take it to a shop and have it properly evacuated/recharged anyways.

 

[slc10844]

Check to see if the compressor stays engaged all of the time. It should cycle with the engine running and the system on. Not sure if your system has a relay or not, but if it does and the compressor doesn't cycle, the relay may be stuck. If it is low on freon, it won't get cold enough to freeze. The compressor will short cycle.

 

[o2batsea]

There's a filter for the ac under the fiberglass top. I have had mine up a few times. It's a pain because you have to lift it up just enough to get in there and undo the light connectors, before you can do anything. It is best to have a helper but I can do it alone since I've done it before. Anyway once you have the bolts out and the wires loose you can prop up the front. Now you can vacuum out the crud that collects up there and check the drains. Its very interesting how everything is crammed up there. Also a good time to install the Alpine and JL speakers. Have fun.

 

[arsenix2001]

Check to see if the compressor stays engaged all of the time. It should cycle with the engine running and the system on. Not sure if your system has a relay or not, but if it does and the compressor doesn't cycle, the relay may be stuck. If it is low on freon, it won't get cold enough to freeze. The compressor will short cycle.

Not true,
Taken from Hvachelpdesk.com and personal experience with leaking units.

Lack of refrigerant or a low refrigerant charge is also a symptom of a frozen evaporator coil.* Contact your local HVAC contractor to charge and conduct a refrigerant leak test.

Ive had 2 home units completely ice over due to low charge, one was old, one had a leak on a heat pump.

 

[8404]

thanks everyone ill get it all checked out by someone. especially the filters under the top, i bought this tractor used and i have no owners manuel so i have to guess at were things are.

 

[dourobob]

i have no owners manuel so i have to guess at were things are.

Manuals are definitely worth the price!

 

[8404]

Well i didnt get it in to see a shop yet but i did open up the top and check for drain blockages and found that the drain tube was kinked up and over the small air filter as it leave the drain pan and air box. I removed the filter so i could staghten out the drain tube and a bunch of held back water started draining out so there was definatly water no getting out of the cooling chamber... so then i put it all back together and turned the AC back on and it has a strong airstreem comming out of the vents now and it verry cold, so it might be fixed ill know after i go on a 2 hour bush hogging this week. one other thing i noticed in the 5 or 6 minuits i was testing the AC i noticed my compressor stayed engaged and didnt seem to cut on and off the way i would have thought it would. so it might still have a problem.

 

[arsenix2001]

Careful with that tho, my compressor on my ls190 and c190 skid steers stayed on all the time.

 

[8404]

what part needs replaced to make the compressor work correctly, im going to put in the shop tomarrow

 

[grsthegreat]

My DK45 has 4 air filters, but there all accessable fromn the underside of the roof via 4 separate access doors. Each has 2 screws.

I second or third the low freon post. this is what happens to residential units when there low on freon also. they freeze up solid

 

[8404]

Ok so i had my local car mechanic look at my AC and he hooked it up to some kind of pressure checking thing and he said my tractor held 35psi in the AC system at idle and at high RPM, he said he thought it was were it should be and he didnt add any Freeon but he also said the compressor didnt cut on and off with him either.. and wasnt shure if the tractor system even had pressure switches. .... so i used the tracter for about 5 hours of bush hogging and it again stayed very comfortable for about an hour or so before the vents stoped blowing air out, the vent were still cold just no air flow. so i started turning off the AC for a coulple laps around the feild untill i couldnt stand the heat and would turn the AC back on again and it worked great the airflow was hard and verry cold. but of course i couldnt go long before it would ice up again. so im still need some advice from other kioti owners.
-does this AC unit have pressure switches?
- how much PSI should the system be holding? as of now its 34,35 PSI
-and will i need only Kioti parts to fix it or can a local Aircondision shop get
the parts to fix this?

 

[steve0413]

I'm no A/C expert, but I've seen where it needs to be 50-55 psi.

Edit: I got that number off the R-134a can. It's based on an ambient temperature of 100 degrees. If Northern Mississippi is like here in Arkansas and it was tested outside, then it seems to me that you need to add refrigerant. According to the table on the can, 35 psi would be normal if the ambient temperature was 60-70 degrees. Also, the freezing up is a definite sign of low refrigerant.

 

[slc10844]

Since it is working until the evaporator freezes it has enough freon. There are usually 2 pressure switchs and a relay in the system. Both switchs are usually mounted on a refrigerant line, one before and one after the compressor. A high pressure switch may actually be mounted on the compressor and protects the system from high pressure. The low pressure switch cycles the compressor. Both switches, on most systems, feed a relay that controls the compressor. If the relay sticks it will cause the compressor to stay engaged all of the time. Check the clutch by disconnecting the battery to see if the clutch releases (rotate the clutch by hand). Some relays are fed by battery current and are hot all of the time, even with the key in the off position. If it releases there is probably a stuck relay in the system somewhere, usually in the fuse panel. Some of the new automotive systems also use a computer to control the A/C depending on input from various sensors. I'm not familiar with the Kioti system, but I doubt that there is a computer used for A/C control.

 

[arsenix2001]

Ill say again, if you are confident you have all filters and coil fins clean, it appears that the system is operating on low pressure, and you cannot accuratly measure just by guages. It needs to be evacuated and recharged to the proper weight spec of freon and lubricant specified for the tractor. Your symptoms still fit my original guess. And lastly I would not be suprised if it has no pressure switch, none of my new holland skid steers did. If it were me, i would be finding a dealer to reference thier shop (not owners) manual to check all filter/screen locations and the operation of the compressor. **** they should know right off the bat if they work on many. Have them properly recharge your system and add tracer dye. You will then have working ac, and can check for leaks with a black light

 

[8404]

arsenix2001, I hear you im going to call tomarrow, Im one of those people who bought a Kioti knowing there is no dealer near by so have two buy parts online then find a mechanic to help me fix it. So ill call a Kioti dealer tomarrow. I only found one switch looking thing on the inside of the canister looking thing it has wire going to it. and one relay switch in the fuse box. I checked the compressor too, it turns by hand with the wire disconected, i toulk a picture of some parts incase someone can see something important.

 

[slc10844]

Check the part number of the a/c relay with one of the other relays, like the headlight, and if it is the same part number switch the relay and see if the a/c runs and cycles. If there is no change you might an expansion valve in the system. The switch on the dryer (the black canister) is the low pressure switch. This appears to be a similar to the old Chrysler system which used an expansion valve to regulate the flow of freon. All the low pressure switch does with this system is shut the compressor down if the freon is below a certain pressure. The newer systems regulate the flow by turning the compressor on and off. An expansion valve is like a rectangular block of metal at the end of the line from the dryer.

 

[slc10844]

The dryer has a sight glass on the top. Run the a/c for severl minutes until it stabilizes. Look in the sight glass and you will probably see air bubbles. A constant flow of bubbles may indicate the need for freon. If you only see occasional bubbles you are OK. The best way is to drain the system and recharge with the recommended amount of freon.