Model: 2500hd diesel
Engine Size: 5.9
Refrigerant Type: 134A
Ambient Temp: 90
Pressure Low: 30
Pressure High: 425
Country of Origin: United States
I have a lot of experiance working on different systems, auto, Caterpillar.
I was trouble shooting an intermittant cooling problem with the A/C on a 2005 Dodge pick-up, when I hooked up the guages and turned on the A/C the low press went to a nice 30 psi but the high went up to 425 before the press switch kicked the clutch off then it bounced back and forth from 425 to 250 about 10 times then it just went to normal 30 low 250 high. and it was working fine. I think that the cooling problem is with this spike, but what could cause the high press problem to be there and then just go away so suddenly? Could it be a problem with the Orfice or with the Dryer?
I have never seen anything like this before....
Was the condenser fan running strong the whole time? The most common reason for excessive pressure (assuming the system is properly charged) is lack of airflow on the condenser.
I had just started the truck up for the first time today there wasn't any time for heat to build up. I was reading the pressure right from start up to the time the pressure went back to normal about 1 minute.
I am evacing the freon right now and I am gonna check the orifice..
Well thanks everybody for all of the help, I guess non of you could figure it out???? Well then I guess I will keep the fix a secret....
Never posted back what you found from the orifice inspection.
Fixed it? why not tell us how, and ultimately what was causing the spikes?
I was also wondering where you went. It'd be a rare situation for anyone to be able to absolutely troubleshoot a problem without having the vehicle in front of them to observe and test firsthand.
Edited: Sat September 26, 2009 at 9:20 PM by mk378
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