• Mustang Forums
  • 2015 - 2023 (S550) Mustang -General/Talk
  • 2015 - 2023 Specific Tech

Help locating correct "pin" to jumper on ac relay

  • Thread starter Thread starter Perkey
  • Start date Start date Apr 5, 2020
P

Perkey

New Member
Apr 5, 2020
1
0
1
Murfreesboro
Apr 5, 2020
#1
  • Apr 5, 2020
  • #1
2016 5.0. I'm trying to use a wire to jumper the ac compressor clutch to engage to diagnose why my ac is blowing warm air but not sure which holes to stick the wire in. There's no diagram on the relay. The fuse and relay are both good. The compressor doesn't engage. It's a 2016 so I can't image it's that low on coolant but who knows these days.
 

I Bleed Ford Blue

5 Year Member
Feb 13, 2017
416
122
73
North Olmsted OH
Apr 5, 2020
#2
  • Apr 5, 2020
  • #2
Don't do it, the newer cars use the ECM to control the A/C. If you choose wrong you can damage the ecm and/or the a/c clutch.
 

redNfast

Active Member
Apr 5, 2020
70
33
28
Woodstock, GA
Apr 5, 2020
#3
  • Apr 5, 2020
  • #3
The clutch uses 12vdc, to engage the clutch. The low pressure switch controls the coil of the relay via ECM. Coil closes the contacts of the relay, suppling the voltage for the clutch.

With the power plug removed form the clutch, using a meter set to 12vdc, black probe to ground.

Set the ac on, ignition on, put red meter lead into pin of the plug removed. If no voltage is found the low pressure switch is detecting low freon .

Find 12vdc the clutch on the compressor is toast. To confirm, leaving the black led connected to ground . Set meter to OHMs, probe the male pin on the compressor. You should get a reading, it will have some resistance. If no reading the clutch is toast, coil is open.

My guess 2016, low freon, no voltage on the female pin of the plug removed from compressor .

It could also be a bad really......
 
You must log in or register to reply here.

Similar threads

82 Gen 1 Coyote Swap AC Questions...
  • thinkfaster
  • Aug 14, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
1
Views
372
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Aug 15, 2025
thinkfaster
C
Electrical HELP! 1989 5.0 Stick, Voltage Bleed onto Ignition Trigger wire
  • ChickenDeluxe
  • May 14, 2026
  • Fox 5.0 Mustang Tech
Replies
7
Views
236
Fox 5.0 Mustang Tech May 24, 2026
ChickenDeluxe
C
Electrical 89 fox AC help please
  • Fast89GWILL
  • Dec 5, 2024
  • Fox 5.0 Mustang Tech
Replies
5
Views
509
Fox 5.0 Mustang Tech Dec 18, 2024
Mindseye007
J
2003, 3.8l with air conditioning problems
  • Jimb0z '03
  • Nov 3, 2024
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
6
Views
505
1996 - 2004 SN95 Mustang -General/Talk- Nov 4, 2024
Jimb0z '03
J
M
Progress Thread mnky99 2001 V6 evap core, ac compressor, heater core replacement
  • mnky99
  • Sep 5, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
1
Views
513
1996 - 2004 SN95 Mustang -General/Talk- Sep 5, 2025
mnky99
M
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 2015 - 2023 (S550) Mustang -General/Talk
  • 2015 - 2023 Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?