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<p>Filters were the evaporator intake filters. I have to blow out
the condensor sometimes 4 times a day. Especially if baling
bluestem hay when it has gone to seed. I forgot to mention that
when I had to problem the other afternoon, the tractor was runnin
with the A/C on and I pulled the condensor and the hyd cooler out
of the rack in front of the radiator to clean off the usual
trash. The condensor dropped down on the ground and after a few
minutes while I was cleaning the radiator, there was a blast of
freon from the back of the engine like a popoff valve blowing
off. I shut off the A/C ASAP. I added a little Freon when I
found the plugged filters. The problem seems to start when I
start up in the afternoon with a hot evaporator. As I said there
are a bunch of New Holland and some of the last Ford tractors that
have a switch installed to turn on the compressor. <br>
</p>
<p>A thought occurred that it might be a circuit breaker that is a
thermal type and the electric load compounded with the heat of
the interior might be causing the breaker to open. I chased a
blower problem like this for 3 months and $300 parts before I
found the circuit breaker and replaced it with a fuse. It worked
fine with the heater, but the A/C would load the breaker... <br>
Cecil<br>
</p>
<div class="moz-cite-prefix">On 7/21/2019 9:48 PM,
<a class="moz-txt-link-abbreviated" href="mailto:bradloomis@charter.net">bradloomis@charter.net</a> wrote:<br>
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<p class="MsoNormal"><span style="color:windowtext">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.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">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. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">Best I can
think of.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">Brad<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span
style="color:windowtext"> AT
<a class="moz-txt-link-rfc2396E" href="mailto:at-bounces@lists.antique-tractor.com"><at-bounces@lists.antique-tractor.com></a> <b>On
Behalf Of </b>Cecil Bearden<br>
<b>Sent:</b> Sunday, July 21, 2019 7:32 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:at@lists.antique-tractor.com">at@lists.antique-tractor.com</a><br>
<b>Subject:</b> Re: [AT] not antique but tractor
related.<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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???<br>
Cecil<br>
<br>
<o:p></o:p></p>
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