88 GT blend door power plug (Page 1/1)
Duck 1 JUL 04, 04:56 PM
Need 88 GT blend door ( actuator) power plug wiring diagram. Does anyone know where the 5 wires go to ?
Vintage-Nut JUL 04, 10:58 PM
If you don't have a '88 Pontiac Fiero Service Manual; I'll suggest to get one and the Air Conditioning System starts on page 8A-62-0 with overall checks.
Use the A/C system check table as a guide with the symptoms and diagnosis steps.

The Air Conditioning System controls four doors with two actuator motors:
The 'Mode' door actuator and the 'Recirculation' door actuator.

The 'Mode' door actuator plug has four wires; Norm, B/L, Vent/Heater, Defrost and controls two doors with linkage; the 'Heat/Defrost' Door and the 'A/C Mode' Door.
The 'Recirculation' door actuator plug has two wires; Max and Norm/Vent and controls one door with linkage.
The Temperature door has a cable only, meaning no actuator.

If you hear the actuator working, check the door linkage.
If you don't hear the actuator working, check the actuator / motor.

Good Luck!
IMSA GT JUL 04, 11:40 PM
Don't know if this helps you.

[This message has been edited by IMSA GT (edited 07-04-2023).]

Duck 1 JUL 05, 11:11 AM
Thank you very much for your response. This was great information . I had ordered a used actuator motor from EBAY and when it came in I plugged it in and nothing happened. I went back to your information and then looked at the used part I had ordered an suddenly realized my problem. The used actuator only had 3 terminals and the original in the car has 4. The used part he sent had a part number of 3052050 0136. Now I have got to find out what the correct part number should be. I hope the person that sent the wrong part will have the correct one or refund my money so I can get the right one.
Duck 1 JUL 05, 12:37 PM
I am missing something. You stated that there were 2 actuator door motors. I can not find but 1 behind the radio. Where is the location of the second one and do you know the part number. Maybe the one I got from EBAY is the one I can not locate you have a diagram of the location of both motors, I would appreciate a copy of their location and part number, thanks again.
Vintage-Nut JUL 05, 03:48 PM
The 'Mode' door actuator is inside of the A/C box - https://www.fiero.nl/forum/Forum2/HTML/136715.html

Another Valuable Fiero Tool to Own
Pontiac 1984-88 Part and Illustration Catalog 22P

Air Conditioning: Group 9
Page 9-2, part shown as #51 (GM #03052051, Actuator, mode)