Engine swap done!!

[LS6_Silverado]

Hey guys,

I just finished my engine swap last night and it started up first try. But i have some little fixes i need to do, one problem is its throwing me a PO443 dtc code also the a/c turns on but its not cold at all. I think they both are probly related. Does anyone have any idea?

I triple checked all the plugs and there all plug in firmly.

Thanks Brandon

[skeet]

if not mistaken, po443 has to do with the evap system which you can have turned off in a tune. the other sounds like the conpressor is not getting power or signal to come on ...

[SCIV]

Don't know, but congrats on the install.

[LS6_Silverado]

So what im getting is that my ac compressor isnt getting power? does anyone know what po443 even means? Thanks

[r6z4o6]

A/c turns on: the compressor clutch activates and the compressor is pumping, the fan turns on, the defrost blows out window vents only, could you be more specific?

[r6z4o6]

1.) P0443 is Evaporative Emission control system purge valve circuit malfunction. By the way, it is the number "0" and not the letter "O". Did you properly hook up your EVAP system? Not many people do when they do LSX swaps. If that is the case, do as skeet recommended and turn it off in the tune. If you don't know what EVAP is than you do NOT have it and you should turn it off in the tune.

2.) Is there any voltage at the compressor when you command it to come on at the a/c head unit?

[LS6_Silverado]

Hey,

Ok i have no idea what EVAP is.... someone please enlighten me on it. also i cant check the compressor right now for im at work but i will when i get home. Please keep the ideas coming!

Also when i turn on the A/C it activates and starts blowing out hot air.

Brandon

[txarkitekt]

Uh...when you swapped everything, did you keep the original A/C compressor connected? Did you ever take it off the bracket? If you didn't diconnect it, then it might need a recharge. The A/C compressor has two connectors that you need to plug into it. One to the compressor itself and the second is the A/C clutch. Make sure both are properly connected. Go back and double check all of the electrical grounds to the front and back of the motor.

The P0443 code can be thrown by a improperly tightened gas cap or if the breather tube on the gas tank neck that goes to the side of the bed at the fuel door is not secured. The code also may be thrown by the fact that you did not connect the EVAP system and the PCM is either wanting to open or close the vent solenoid--but if it isn't hooked up, it cannot give a signal to the soleniod. And if not return signal is sent, the PCM freaks out and it results in a CEL. Can you quickly have your PCM tuned to turn off the EVAP?

[TxStVanWilder]

freon low??

[LS6_Silverado]

Ok guys,

No i didnt disconnect the a/c compressor, power steering and alternator. I just zip tied it all to the side. I didnt discharge the freon so i know i dont need more.

Now for the ground situation, there was a ground on my iron block behind the intake, there wasnt an area for it on the ls1 block so i relocated it to the back bolt of the vally pan. Could this be the problem?

Brandon