Eric in KY
Member
Well, we changed the compressor, the expansion valve and the dryer and the high pressure switch is still kicking the AC out. We can bypass the switch but the high side line gets too hot to touch. Any suggestions?
(quoted from post at 13:01:36 06/08/16)
Ditto what Roger stated.
If refrigerant pressures are correct & cond,rad & evap plus cab filter is clean I'll guess faulty high pressure switch is the problem
(quoted from post at 13:02:01 06/08/16) I think the pressure on the high side is the determining factor. I have seen them so hot you could not hold on to them.
Is the pressure OK and is it working?
(quoted from post at 09:44:29 06/08/16)(quoted from post at 13:02:01 06/08/16) I think the pressure on the high side is the determining factor. I have seen them so hot you could not hold on to them.
Is the pressure OK and is it working?
Dave, the AC is working only if we bypass the hp switch. I don't see any way to check the high pressure. There's no port to hook the gauge.
(quoted from post at 16:27:47 06/08/16) When was the last time the AC condenser AND the radiator were removed and cleaned 100%?
As in when you look through the core tubes/fins at light you can see they are clean over their whole area.
Unless it's really HOT right now where you're at, there's no reason for high condensing pressure and HEAT leaving the condenser.
Also, I ASSUME it's been properly evacuated before being charged to eliminated non-condensable gases?
(quoted from post at 18:49:48 06/08/16)
Eric in KY
Does your tractor have a compressor similar to photo of my 4255 compressor? JDparts shows both tractor ac components are similar. If so it should have 2 connections similar to the ones with a red cap & blue cap
(quoted from post at 09:45:06 06/10/16) On these models I have been by-passing the timer switch,,they are pricey and 4440's ran well with out them,, just more electronic crapp added to the mix,
(quoted from post at 01:56:54 06/11/16) hello,, i install a JIC tee fitting where your hi switch is,, so you can use the hi switch, and a R134 test
fitting. i keep these in my AC BOX at the shop,, part # AE----- i am not at the shop now.
(quoted from post at 14:45:06 06/10/16) On these models I have been by-passing the timer switch,,they are pricey and 4440's ran well with out them,, just more electronic crapp added to the mix,, I unplug the Yellow wire off the cold switch, run a new wire from that terminal to the low pressure switch on the left rear corner of the cab roof, through that switch and down the left front post to the compressor, this gives you low pressure protection, and I know it does away with High pressure protection but in my area that has never given a problem, this works out well,,and go on to the field..
(quoted from post at 05:41:14 06/11/16)
Tim, that's what we're doing temporarily is bypassing the switch. I don't really know but I kinda like the other poster's response about adding the tee fitting. What do you think?
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