So after bearing and incredible hot summer and having an AC that blows out warm air, I finally decide to get one of those R-134a AC Retrofit kits. After putting on the new ports, I hooked up a guage that comes with the system and it read around 100 PSI. When I tried to let in the R-134a nothing really happened.... I'm thinking the system probably still has R-12 in it and the compressor or another part of the system isnt working. Is there any way to check if the AC compressor is working or a way to figure out what the *** is wrong? When i turned on the AC the center part of the pulley doesnt spin, is that whats supposed to happen? Thanks.

 

hmm my 93 has it already what year is ur car

 

Your clutch in your Ac compressor is bad or connectors arnt clean check the wire that is above the AC Comp It signals the clutch to engadge

Before you add R-134a you have to get a shop to vacum out all R12 then you add the new stuff.....

 

If you mix r12 and r134a it will become acid and eat your lines. No teeling what it'll do with your compressor. Look back a few pages, we discussed this not long ago.

 

[QUOTE=Maxima Man]Your clutch in your Ac compressor is bad or connectors arnt clean check the wire that is above the AC Comp It signals the clutch to engadge[QUOTE]

Is the high pressure (something around 25 psi is normal) an indication of a bad compressor/clutch?

 

No it is not a sign of a bad compressor because when the compressor is not running the pressure is high like 100psi or so when you compressor turns on it should go down to anywhere between 25 psi and 45 psi.

45psi is the perfect charge without triping the high pressure switch to make the compressor turn off.

I would have a shop vacum the system out that way you can be sure the system is completly dry and then add the R134a to the system.

If you don't have enough old R 12 in the system then your low pressure sensor won't allow the clutch to engage the compressor so Most likly you have too low pressure in your system ...

Do you have a gauge for the system ?

 

Yeah I do have a guage. Once I put on the R-134a ports and I measured the pressure it was up around 100psi and it went down to around 70psi when i turned the system completely on. Given what you said about the pressure going down when the compressor is on, thats a good sign right? Also, when I tried to put in the R-134a I dont think anything went in, almost liek the system was blocked. Does this mean anything? I think im goign to go get the system drained tommorow to make sure nothing is in there. Thanks.

 

Make sure the clutch is kicking on or you will never get the 134 in..also do as he said and vacum out the r12..you might have to jump out the low pressure switch to engage the clutch so it will add. good luck

 

What do you mean by jump out the low pressure switch?

 

Unplug this and jump it out(the end with the wires) and your clutch will kick on. >>>>ONLY DO THIS IF YOUR AC CLUTCH IS NOT COMING ON WITH YOU AC ON MAX<<<<