Just completed a 5.0 swap and the A/C has me stumped...

[R-code]

Help! I'm at my wit's end with this air conditioning system... the truck is a 2002 Sport with a 5.0 out of a 2000. All of the AC parts are less than a year old and came out of the 2002 with the exception of the suction/discharge line, which I sourced from the 2000. Everything worked before the swap, the system is charged and not leaking, and I'm just stumped. I thought I had all of the wiring sorted out but I'm starting to second guess myself. Hit me with suggestions, I'll take anything at this point!

 

[Mbrooks420]

Do you have a dual gauge setup? What are the pressures? Check the high and low switches?

 

[CDW6212R]

Have you checked for a voltage signal at the AC WOT relay, or the LP sensor? The clutch trigger current goes through the LP and HP sensors(switches), and finally to the WOT relay.

 

[R-code]

Whelp, it was fuse #10 in the central junction box... a 7.5a that's supposed to control the turn signal relay. Who knew!?

 

[CDW6212R]

Great, good find.

 

[410Fortune]

okay phew
I was thinking a 5.0 swap in a sport should not require any special AC wiring........ I have had my fill of special 5.0 wiring for a couple of weeks HAHAHAHAHAHA

 

[R-code]

okay phew
I was thinking a 5.0 swap in a sport should not require any special AC wiring........ I have had my fill of special 5.0 wiring for a couple of weeks HAHAHAHAHAHA

You do have to add a pigtail to the engine harness to accommodate one of the pressure switches, but it’s not difficult at all. There’s also a grey/white wire at the connector on the other end of that new pigtail that needs to be re-pinned so it lines up correctly with the Sport’s body harness. Super easy, especially if you’re able to do it while the engine is out.