Thoroughly confused about adding AC to a 3800sc engine (Page 4/4)
Dennis LaGrua JUN 12, 09:42 AM

quote
Originally posted by dcarrd:

To the existing port on the high press hose



OK now I get it. You had the hose made with a 7/16' switch port and wish to convert it with the adapter. If you go this route I would make sure that the adapter has a provision for depressing the valve so the pressure is seen at the M10 side.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

dcarrd JUN 12, 10:56 PM
correct, or I can get the switch from a 1990 to 1993 3.1 cars like Darth suggested.
But I have other problems now, my hoses are leaking. The guy that did them didnt crimp them right so Im deciding if I want to just buy a set off the Mall or buy the crimping tool and redo them myself. Just when you think you're almost done lol
dcarrd JUN 12, 10:58 PM
I could also remove the valve core off the 7/16" port and use a 10mm adapter with a valve core installed in it.
sdgdf JUN 27, 11:23 PM

quote
Originally posted by Darth Fiero:

Engine block ground.


Since you say you don't have the stock Fiero A/C clutch relay to work with, this is probably why you are getting confused on where things get hooked up. I wrote the wiring instruction sheets assuming you still had and were reusing the stock Fiero wiring bits (for the A/C clutch and such) in your swap.



I’m working on wiring up the ac on my 3800sc-swapped 88 coupe. I have a problem. C2-34 and c2-35 are wired weird. It looks like they’re spliced together and hooked up to c2-55. That’s listed as fuel tank pressure signal. I bought the car already swapped, what could this mean? Can I safely disconnect that and hook them up to my ac wiring?

[This message has been edited by sdgdf (edited 06-27-2023).]

sdgdf JUN 28, 12:03 AM

quote
Originally posted by sdgdf:


I’m working on wiring up the ac on my 3800sc-swapped 88 coupe. I have a problem. C2-34 and c2-35 are wired weird. It looks like they’re spliced together and hooked up to c2-55. That’s listed as fuel tank pressure signal. I bought the car already swapped, what could this mean? Can I safely disconnect that and hook them up to my ac wiring?




From what I read online, that pressure sensor is for evap and testing the gas cap. It may be wired this way to fool that test in the pcm? I see no codes for evap with scan tool. My light on the dash is disabled because I have codes for the emissions o2 sensors so I don’t care if it throws another emissions code, it won’t matter if I remove this wire bypass and hook it up correctly for my ac?
sdgdf JUN 28, 05:12 PM
Took the heat shrink off the spliced c2-34 and c2-35 wires and found a resistor on each of them, and that arrangement soldered to the c2-55 wire. I’m just going to take that all apart and run the wires correctly for ac. Anyone know if I can just run a ground wire for this transducer instead of connecting it to c2-35?