OffspringZ28

OK, so my ac is blowing hot air. there are no funny noises and no funny smells. I took it to a local place and they said that my pcm or something wasnt working. (???) Something about a bad electrical connection or something. anywho, a couple months before it went bad it was blowing COOL air and white-ish steam stuff. the steam was not condensation however and would occasionally go away and come back in like 10 minute intervals. Now after reading THIS post : http://web.camaross.com/forums/showt...r+conditioning

now i pulled the pcm fuse but my radio stations are still there so im thinking that didnt do anything. AC still blows hot. you never really appreciate something until its gone.....

Cmr0z28

shoebox

I'm no a/c expert, but pulling the PCM fuse has nothing to do with the radio.

OffspringZ28

so it DID reset the computer? i thought maybe resetting the PCM would result in losing the radio stations like when you disconnect the battery. guess not so the ac still blows hot......crap

OffspringZ28

well with freescan i cleared the codes (only one 02 code) thinking that would work but it didnt. still blowing hot. now what do i do?

OffspringZ28

ttt

valter

Try jumping AC clutch relay to make sure it's working. Computer needs a signal from AC controls, correct voltages from R134 pressure sensor and evaporator temperature sensor. If all is ok, it will operate clutch relay. Do a search, there were like tutorials from HBHRacing there (helped me a lot )

IRONCROSS97

IF YOUR CAR IS BLOWING HOT AIR check to see if your compressor is turning on, if not then that is a clear sign that there is not enough r-134 in your system to turn on the compressor. i just went through it with mine, noting a recharge wont fix until the dye they install finds the hole

HBHRacing

Yes. turn the AC on and see if the center part of teh compressor is spinning or not.. thats step one.

if it's not you could have a slew of issues to sort through. yes it is possible for the PCM to cause the compressor not to come on but I have only seen that happen once in my life.

start by telling me if the compessor is comeing on.. it would also be very helpful to find out how much pressure you have in the system. do you have any kind of gauge at all?

jtk

the place you took it to dident just open the hood and say replace your PCM did thay? I mean a bad PCM could cause the A/C not to work but is that realy the cause and what led them to that?

HBHRacing

they would have had to do a good half hour of electrical diagnostics to think the PCm was bad. if the AC reqest signal was going into teh computer yet the clutch contorl ground was not then sure it;s the PCM asuming that all the other comonents where looked at as well..

OffspringZ28

ok so i cant get the compressor to turn on. and when i hook up the DIY recharge kit the pressure gauge reads 100psi. i know im supposed to connect the gauge to the "low side" or something but i dont know where that is. i was using the port on the ac line right by the PCM.

HBHRacing

if the gauge fit the port then you got it right. the low side port IS the port on the larger of the 2 lines.

now if it's reading 100PSI with the ac not coming on then your system is full. thats good.

now it's a matter of electrical diagnostics. do you have a test light or multi meter and are your ok with testing the system if I walk you through some tests?

OffspringZ28

I dont have any testing equipment. someone was telling me about paperclipping the switch on the sensor right next to the port for the gauge to kick the compressor on. is this true? thanks for taking the time to help me by the way.

HBHRacing

is it true? to a point. is it a good idea? no.

if you can go and buy a test light from autozone or get your hands on a multimeter I can tell you what to test