Jump to content

joh510

Puppy Poster
  • Posts

    11
  • Joined

  • Last visited

joh510's Achievements

Apprentice

Apprentice (3/14)

  • First Post
  • Collaborator
  • Week One Done
  • One Month Later
  • One Year In

Recent Badges

0

Reputation

  1. I just noticed whenI trun on my fan on full and my air controls on, this wire that goes to the compressor that is to supply positive 12v power is getting nothing? does the expansion valve turn it on or should it always be on?
  2. OK here is what I am dealing with and maybe someone can give some insight on what to look for or what to do with this air conditioner system Older 1985 International Truck, was a r-12 system that someone supposedly removed the older oil and changed over to newer R-134a so here is what I did, when I started this the truck air conditioner compressor would cycle but no cold air, at one time there was cold air but that was last year. Now to today, I removed the old rusted out receiver /dryer and replaced it with a new one and replaced 1 new line that was bad and rusted. Before installing the new line and receiver/ dryer I removed the lines off the compressor and flushed the condenser and and the evaporator with a flushing agent for air conditioner systems, the blew all lines out with air until nothing was coming out . installed the new line, receiver/dryer, new o rings, and re-installed the lines on the air conditioner pump with new o rings. then vacuumed the entire system, low and high side for 45 minutes. Watched it for 5 minutes after to insure it maintained negative pressure before starting to load it. I started with a 6 oz can of ester oil and r-134a and noticed the pressure with the unit running shot right up low side 35 psi ,high side stayed low , pump would not engage. Added another 6 oz can of the ester oil with 134a and unit running but pump still would not engage, for some reason I was not getting power to the compressor unit? so I added 12 volt power to engage the pump manually while running to see if the unit would load any r-134a, the low side seemed as if it did not want to take the 134a, and noticed the pressure on the low side going to 80 lbs while the high side stayed all the way down to about 20 lbs? What would stop the power from getting to the compressor ? why is the pressure not correct? what turns the pump power on and off? I didn't see a expansion valve or orifice tube where is that hiding and could these cause the problems? I dont knwo why it would cycle before I did this stuff? and ideas I m showing some pictures , may be I can get a little help, thanks
  3. the previous owner told me he had the pump off few years ago and changed the oil so I was wondering cant I just change the receiver/dryer then vacuum it and reload the system with 6-8 ounces of ester /134a in the can right into the low side port then follow with r134a ?
  4. I have a older truck, not a mack but a international that has the old R-12 air conditioner system on it, I know how to do the changer over basically but I dont understand 3 things if someone can help? 1) When I add the first can of pag oil to the system before I add cans of r-134a what viscosity should I use I seen the local parts stores sells Low (46), medium (100) and high (150) viscosity cans of pag oil ? 2) What is the difference between pag oil and ester oil in the larger can? 3) What should my gauges read on the low and high side ....should be reading when I load it so I dont under load it or overload it?
  5. air coditioner

  6. wow 250 - 450 ? that's high I never would of thought of that.. Any idea what would make the clutch on the air conditioner compressor to stay engaged
  7. Have a mack rd model and trying to find out what the gauges should read on the air conditioner LOW pressure side and HIGH pressure side ? want to make sure its not over charged, because My clutch unit is not kicking off automatically.. temp in my area in the summer is 70-90 degrees its blowing very cold air.. any help would be great
  8. Have a older RD model dump mack and noticed every time it rains I get water on the floor under the dash mostly on the passenger side, where is this coming from? the vent in the front center is closed.. anyone? driving me crazy!
×
×
  • Create New...