The system itself seems to work fine. If I leave the clutch jumped, the system will cool the inside of the cab until the evaporator frosts up and loses it's cooling capacity.
Also, as long as the pump is running, the "suck" fitting/line at the head remains very cold/sweaty and the discharge fitting/line is hot to the touch. What's really odd is that the engine fan will 'cycle' as long as the pump remains engaged(!).
There is another 2-wire switch(?) located in the box under the passenger's seat that houses the evaporator, heater core, blower fan, etc near the evaporator. This switch is equipped with a capillary tube leading to the evaporator. I can "jump" across this switch with the same results as above.
It "appears" that my only problem is that the compressor clutch won't 'cycle' off/on.
Thanks for your help so far. I have just one more question...
How sure are you? The reason I ask is, as you probably already know, these Class 8 parts are very expensive ($60 just for the high pressure [fan] sensor at the pump!).
The switch with the capillary tube is actually a box about 1" x 1" x 2" with the 2 blade style connectors and looks to contain a small circuit board with some electronic components. I'm guessing this is my low pressure switch? It's probably expensive too. I'm just trying real hard not to fix this problem through the process of elimination.
I appreciate your patience...
ASE Master Auto Tech
ASE Certified since 1972,Master Auto tech,Heavy Truck Tech, foriegn and domestic
Okee Dokee. Good answer.
I was fairly certain this was my problem but felt the need for a (more) qualified second opinion.
Thanks again. I'll keep you posted if this does the trick. Have a good one...
Thank you for using just answer. I'll be here if you have any more questions on the subject. Just ask for me or log on to this question.
Left you some Positive feedback...
It just so happens that I'm sitting directly across the street from an International dealer in upstate New York and it's hot here during the day.
They actually had my part in stock - even though it has been revised (updated) since and looks surprisingly different from the original except for the mounting. International is calling this a "freeze" switch P/N XXXXXXXX1. Anyway, $40 and an hour later, I'm no longer sweating inside my truck. Instead, I am enjoying the comforts of a highly functional A/C system. Thanks to you.
Have a good one. Many thanks again...