Can I get a wiring diagram for the A/C/Heater control unit?

1989 CHEVROLET 1500
10,000 MILES • 6.2L • V8 • AUTOMATIC
Avatar
RDAYTON80
  • MEMBER
  • 1 POST
Need a wiring diagram for the AC Heater control unit, the wires that plug into the unit have been cut. Where do these wires fasten to the power supply and ignition switch?
Nov 3, 2022 at 12:34 AM
Avatar
CARADIODOC
  • ✓Experienced Mechanic
  • 34,405 POSTS
This first diagram is without A/C. The second one is with A/C. That's the only one I see a controller on. These can be hard to read, so in the third diagram, I blew up the controller section, and in the fourth, I made the connector bigger.

Let me know if you need another section expanded.
Images (Click to enlarge)
Attached Media
Attached Media
Attached Media
Attached Media
Nov 3, 2022 at 4:28 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle