[AT] not antique but tractor related.

[bradloomis at charter.net]

If it’s that hot and cutting out on a HP switch, it could be actual high pressure. I’d be leery of bypassing a HP safety. Is there a possibility of non-condensables in the system? Of course that would mean you’ve had the system open or it has run in a vacuum with a leak. I never did automotive A/C only commercial and industrial refrigeration. In commercial 134a does not do well with dirty condensers. Can’t tell you home many compressors I’ve replaced on beverage coolers like every convenience store in the world has because the condensers suck a zillion tons of dust and lint a day. R12 would tolerate periods of high discharge way better than 134a. It doesn’t do well in my vehicles either. If it gets really hot as California can, any extra load on the engine, be it my VW diesel or my truck, you can tell the A/C output drops 10-20°. Temporary, but noticeable on a really hot day. 

Are the air filters you speak of on the evaporator or condenser? Clean your condenser, again. Or you have an electrical issue that is causing something to open, the clutch, a safety, overload. Harder to track for sure as you’d have to ohm those items when the A/C quits while it’s hot. 

Best I can think of.

Brad

 

From: AT <at-bounces at lists.antique-tractor.com> On Behalf Of Cecil Bearden
Sent: Sunday, July 21, 2019 7:32 PM
To: at at lists.antique-tractor.com
Subject: Re: [AT] not antique but tractor related.

 

I have worked on vehicle air conditioning systems since I was 13 yrs old.  That is about 52 years.  I have seen a lot of crazy problems and fixed every one that I was asked to work on.  Having said that, I am stumped.  The TS110 money pit has always had a great air conditioner.  a couple of weeks ago I was cutting hay in a field a little ways from home, so I had the atv to travel back and forth in case of breakdown, etc...  I baled for about 3 hours, then stopped for lunch.  I returned and started the tractor and noted the a/c was not working.  The compressor was not turning.  I tried many different thing including bypassing the low pressure cutout that had been replaced a day earlier.  It finally started working after I had the doors open to the wind and the interior of the cab cooled off.  This took about an hour.  It worked fine.  I put it in the shed.  2 days later I had to bale another field and got started about 1pm.  It was hot and the A/c would work for about 2 or 3 minutes then quit for 10 to 15 then run just a little then quit again.  I spent the next 3 hours in a 95deg greenhouse.    I spent last Friday morning checking the freon levels and the switch connections.  I found the air filters were really badly plugged.  I found the only ones were 65 miles away and got them.  Without the filters the A/C worked fine and had the correct pressures for a R134 system.   Today I got started baling about 10 am and baled until 5pm and only once was it blowing not real cold, but other wise worked fine...   Later this evening it was starting to rain and I went to back it into the shed, the interior of the cab was hotter  than a 2 dollar pistol.  The A/C would not blow anything but hot air.  The heater does not work on this so, it is not heater hoses.  When the interior is hot, the system will not get started....    I am thinking a high pressure cutout switch.  I really hat to bypass things, but I have seen so many NH tractors at sales of this vintage that have an extra switch in the cab for turning on the A/C clutch, I think maybe it is a design defect as there are so many......  Anyone had any experience like this???
Cecil



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