Electrical Jumping AC low pressure switch

JD1964 · Jul 2, 2024

Can I test the compressor clutch by jumping the switch with KOEO or does the engine need to actually be running? All I’m looking to get is a click from the compressor clutch to confirm the electrical circuit.

I’m just trying to make sure I have all my ducks in a row before I bother hooking up the lines and refrigerant.

Mcmahst · Jul 2, 2024

This thread might help:

Electrical - Foxbody AC System Issue!

I have followed Jrichker detailed steps on getting AC compressor Clutch to engage. At WOT relay i have no power to black yellow wire. I have 12V to Pink LT Blue as well as 12V to Red. I Grounded the Orange LT/Blue wire with a good ground, and still didn't see 12V. I then went and bought a new...

stangnet.com

JD1964 · Jul 2, 2024

Mcmahst said:
This thread might help:

Electrical - Foxbody AC System Issue!

I have followed Jrichker detailed steps on getting AC compressor Clutch to engage. At WOT relay i have no power to black yellow wire. I have 12V to Pink LT Blue as well as 12V to Red. I Grounded the Orange LT/Blue wire with a good ground, and still didn't see 12V. I then went and bought a new...

stangnet.com

I found what I needed there. Thank you

JD1964 · Jul 2, 2024

Good news is I vacuumed the system down for 45 minutes then turned the pump off. 2 1/2 hours later it’s still holding 30 inches vacuum

JD1964 · Jul 7, 2024

I don't want to neglect important things on this R134 conversion process. I went ahead and ordered a new drier / low line assembly and a liquid line with orifice tube built in. This system is tight as can be. It's still holding vacuum days later.

Bullitt347 · Jul 7, 2024

Vacuum and pressure are two different things.
30" of vacuum is one thing.
250+ psi on the high side is a completely different matter.
I not saying you have a leak, I am just stating that you won't really know until the system is charged and running at pressure/temperature.
I have seen a lot of systems hold vacuum but leak once the system is charged.
If you can, put some dye in the system so that if it does leak, it will be easier to spot.

Mustang5L5 · Jul 7, 2024

Agree. The system is really designed for pressure. So holding vacuum (while a great sign) doesn’t necessarily mean it won’t leak under pressure.

When I did my AC system, I pulled a vacuum and then filled the system with 100psi of nitrogen and let that sit.

JD1964 · Jul 8, 2024

I’ll be changing both the liquid and suction lines. Is it worth while adding any extra insulation to either of these lines to prevent heat transfer in the engine compartment?

Mustang5L5 · Jul 8, 2024

JD1964 said:
I’ll be changing both the liquid and suction lines. Is it worth while adding any extra insulation to either of these lines to prevent heat transfer in the engine compartment?

I doubt it will make any significant difference. If anything, i think the insulation is more to prevent chaffing.

JD1964 · Jul 21, 2024

I got the lines changed, leak tested via vacuum and charged it up including 27 oz r134 and 4oz ester oil. She’s blowing 50 degrees out the vents idling at 93 ambient temperature. That’s a 43 degree drop and good in my book.

One inquiry I’ll need to follow up on is my e fans. I have the dual Contour setup controlled by DC Current variable speed controller. Their instructions say connect ac trigger to the blue wire on the controller. That triggers the fans to run at 50% whenever the compressor is running. There’s another wire on the controller (red) not being used at the moment and I think it may trigger fans to run at 100%. My question is, should I trigger the fans at 100% or is 50% good enough?

Noobz347 · Jul 21, 2024

Start at 50 and see how it goes.

The fans are only good for stop signs, traffic, and parking lots.

JD1964 · Jul 21, 2024

Noobz347 said:
Start at 50 and see how it goes.

The fans are only good for stop signs, traffic, and parking lots.

OK I'll see how 50% works out. So far I've only idled in the garage. Do you think going down the road at a steady speed will result in even cooler air from the vents?

Mcmahst · Jul 21, 2024

Did the fan come with a wiring diagram? On my 2014 Ford F150, it has that “Sounds like a jet engine” speed, that only comes on at slow speeds on stopped when the outside air temp is approaching Hades. I wonder if the red wire is powered by an ambient temp sensor or the water temp sensor?

JD1964 · Jul 21, 2024

40 degrees on a steady cruise and sustained 45 in stop n go traffic

AeroCoupe · Jul 22, 2024

AC in my Coupe with the blue wire triggering the Mark VIII fan at 50% in the summer when we lived in Houston would freeze my ass out of the car.

Mustang5L5 · Jul 22, 2024

I'd run the fans higher at idle with the AC on, but that's me. You can certainly do better than 50's at idle and airflow across the condenser may be a reason. That's why it's cooler at sustained cruise. Check for debris and crushed fins and straighten if necessary

I'd expect 40-45 degrees at idle from an R134a system, even at idle.

JD1964 · Jul 23, 2024

I previously said there was a red trigger wire on the DC Current controller. That is incorrect. There’s a blue one (50%) and a green one (100%).

I checked with Brian at DC Current and verified the following. I can use the blue one on the compressor clutch circuit which will automatically run fans at 50% whenever the compressor clutch is engaged. In addition to that I can run a 12v through an interior mount toggle switch to the green wire. This way I can manually override from 50% to 100% anytime I see fit.

Noobz347 · Jul 23, 2024

JD1964 said:
I previously said there was a red trigger wire on the DC Current controller. That is incorrect. There’s a blue one (50%) and a green one (100%).

I checked with Brian at DC Current and verified the following. I can use the blue one on the compressor clutch circuit which will automatically run fans at 50% whenever the compressor clutch is engaged. In addition to that I can run a 12v through an interior mount toggle switch to the green wire. This way I can manually override from 50% to 100% anytime I see fit.

Use a toggle switch with a dim amber light.

I always seem to have a difficult time finding aftermarket automotive switches that aren't trying to be the star of every show when it gets dark. LoL

Electrical Jumping AC low pressure switch

JD1964

there is enough sticking out to grab on to

Mcmahst

Electrical - Foxbody AC System Issue!

JD1964

there is enough sticking out to grab on to

Electrical - Foxbody AC System Issue!

JD1964

there is enough sticking out to grab on to

JD1964

there is enough sticking out to grab on to

Bullitt347

I have been doing it wrong this whole time

Mustang5L5

That is…until I whipped out my Bissell

JD1964

there is enough sticking out to grab on to

Mustang5L5

That is…until I whipped out my Bissell

JD1964

there is enough sticking out to grab on to

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

JD1964

there is enough sticking out to grab on to

Mcmahst

JD1964

there is enough sticking out to grab on to

AeroCoupe

lube between the nut and the face. I know my lubes

Mustang5L5

That is…until I whipped out my Bissell

JD1964

there is enough sticking out to grab on to

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

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Electrical Jumping AC low pressure switch

there is enough sticking out to grab on to

there is enough sticking out to grab on to

there is enough sticking out to grab on to

there is enough sticking out to grab on to

I have been doing it wrong this whole time

That is…until I whipped out my Bissell

there is enough sticking out to grab on to

That is…until I whipped out my Bissell

there is enough sticking out to grab on to

Stangnet Facilities Maint Tech... Er... Janitor

there is enough sticking out to grab on to

there is enough sticking out to grab on to

lube between the nut and the face. I know my lubes

That is…until I whipped out my Bissell

there is enough sticking out to grab on to

Stangnet Facilities Maint Tech... Er... Janitor

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