High Pressure switch explosion

Hi, Steve!

Just wanted you to know your advice was spot-on! Everything worked. Thanks.

I just replaced the A/C compressor in my truck listed above 1500hd. I also replaced the accumulator drier and the liquid insert [forget the name now] along with the high-pressure switch on the back of the compressor.

After I added Freon, I ran a diagnostic check with the A/C manifold gauge set.

With my A/C set on MAX and recirc, the gauges read 90PSI on the Low Side and 15 [yes, 15] PSI on the High side. What bothered me most though was when the compressor kicked on, the low side pressure decreased but the high side pressure did not change.

Obviously, I did something wrong or installed something incorrectly. Please give me any advice as to what I should check or where I should go from here?

Dudley "Gunner' Garidel
Baton Rouge, LA

Greetings:

About 6 weeks ago, I installed a new A/C Compressor, A/C Condenser, Accumulator Drier, Liquid Line, Discharge Line, Suction Line, A/C Serpentine belt and a De-slugger.

Everything has been working fine until this past Saturday, July 23rd. I left to run an errand and turned on the A/C as I pulled away. It came on fine with cooling air for about 5 minutes, then suddenly, without warning or any other indicator, it stopped blowing cool air and only blew hot air [I say 'hot' because I live in Baton Rouge, LA, and July is hot as hell around here].

Today I tried to diagnose the problem. I checked all fuses related to HVAC or A/C and the A/C Relay. All were fine and worked.

I then put the A/C manifold gauge on with the engine running and A/C on to see if a freon leak had developed. The low side read 110 and the high side was between 110 and 150, although I forget the exact reading. I assume, therefore, from the reading there is NO freon leak.

I did watch a YouTube [YT] video on check A/C fuses and relays, and the narrator did say something I had not heard before. I have a bad ABS module which I'm about to replace, which has been frequent warning lights. The YT narrator said sometimes the computer will not allow the A/C compressor to kick on if there have been too many warning lights from a problem.

At this point, other than the ABS module issue, I'm out of ideas. If it's a matter of returning the compressor, I'll do so, as I spoke to parts people where I do business, although the thought of having to return the compressor for a replacement makes cold shivers run up and down my spine even in July.

I guess I'm asking for any ideas as to other things I might consider before I look at returning the compressor. Any help you can give me will be much appreciated.

Dudley Garidel
Baton Rouge, LA

Hi Joe, Thank you so much! To tell you the truth, I had a feeling deep down inside which said the compressor was bad. You just reinforced the feeling.

I do have one other question. Do I really need the de-slugger?

Dudley Garidel
Baton Rouge, LA

Joe, thanks again. One other thought occurred to me. I also replaced the orifice tube when I changed the compressor, could it be the culprit?

Dudley Garidel
Baton Rouge

I own the truck listed above 1500 HD with a 6 liter engine.

What amount of R-134a and evaporator condenser oil should be in my A/C unit?

Dudley Garidel
Baton Rouge, LA

Thank you, very much, Joe!

Dudley Garidel
Baton Rouge, LA