Chrysler Repair: chrysler a/c problem, chrysler 300m, 2002 chrysler 300m

Question
hello mr kevin,hum i have a 2002 chrysler 300m and it seems im having a problem with my a/c ive already taken it to a dealership and they say its nothing physical in the car that it may be electrical...the car does as follows:when i turn on the car and its hot outside the compressor malfunctions in a way that it enters and cut repently with no pattern at all.now when the weather is fresh it sometimes works ,,not all the time but it works better than when its hot..ive found out that when removing the compressor relay and connecting it straight it does work but you cant turn it off because its straight out...ive already replaced the expansion valve,pressure valve,dehydration tube,ive already checked the freeon leven on a dealership and they still can find the problem...what can it be i have no ideal can u help me please???any further question e-mail me thank you

Answer
Hi Alberto,
I just fount your question from the "pool" of questions. I answered you on the 15th and so am wondering if you figures this out yet?
Best wishes,
Roland

hey roland good thing to get back to you ...you were maxed out the other day....well after reading your answer i couldnt tell you back that the dealership had already checked the freeon .....and nothing,it still doesnt work.Good thing is that on these days that its fresh the air mostly of the time works...what else could it be there has to be something....parts replaced: expansion valve,hydrating tube,ive already purged the system,new freeon,freeon checked

Hi Alberto,
The compressor cutting in and out could be due to the compressor itself, except I believe that you said that when you jumped the relay socket it worked solidly so that means the clutch must be OK.
The there is the possibility that the compressor relay is weak, but I can't reall if you tried replacing that or not. You could look around the power box for an identical part numbered relay and try switching it out to see if that solves the problem.
Finally, there is the relay control circuit which involves 5 wires (from the fuse to the relay, from the relay to the powertrain controller, and three wires from the powertrain controller to the A/C pressure transducer. (When you say you replaced the "pressure valve" is that the same as the "pressure transducer"?) Any one of those 5 wires could have a flaky connection. If you have a volt-ohmmeter I can tell you how to test this part of the wiring.
Another possibility is to see if there are any fault codes that the powertrain controller might have noticed. An Autozone parts store will often do that for free. An independent shop will do it for under $40. Let me know if they get any 4-digit fault codes and we can go from there.
Thanks for the kind evaluation and nomination.
Roland