Hello All. Been a While. A/C Question.

[Dirtleg]

Well for reasons related to the big "D" I haven't been on here for a while. Unfortunately I will be losing the IDI in the divorce. Not to worry I still have 2 6.9's I'm slowly assembling and will eventually find something to put one in.

On with my question. Last weekend I drove the IDI for a couple of days. The A/C is short cycling. Not getting very cold. I hooked the gauges up and noticed the low pressure getting extremely low. At the same time the high pressure was extremely high. My initial thought is plugged filter/drier or orifice valve. I installed a variable orifice valve in there about 4 years ago when I replaced the compressor, drier, etc.

Mainly looking for confirmation as to my diagnosis or something I may have overlooked. System was converted to 134a in 2007 and that compressor (rebuilt) only lasted a year. So the filter/drier was replaced both times (2007 and 2008) and the lines were fully flushed both times as well.

Thanks for the input.

Greg

 

[OLDBULL8]

Could be the some of the crap finally worked it's way out of the condenser, if it didn't ruin the compressor, prolly a partially plugged orfice. Condenser should have been changed. Since it's pumping a hi pressure it might still be OK. That's my SWAG.

 

[RLDSL]

X2

 

[rhkcommander]

Define high and low pressure... ambient temperature is a good thing to list too

 

[Dirtleg]

Low pressure falling 25psi when switch cuts out. High pressure rising 315psi when low pressure switch cuts out. Ambient temperature 85 degrees. I am inclined to think the compressor is good due to the pressures it can achieve. Also the charge isn't low. Just a blockage which is causing the high and low pressures to spike.