10 Guests, 0 Users

Author Topic: 1972 A/C Blower Switch and Vent Issues  (Read 1081 times)

0 Members and 1 Guest are viewing this topic.

Offline 1972 Wagon

  • Pinto Full Member
  • ***
  • Posts: 103
  • FeedBack: +27/-0
  • Gender: Female
  • 1972 Pinto Wagon

  • Total Badges: 3
    Badges: (View All)
    Mobile User Signature Topic Starter
1972 A/C Blower Switch and Vent Issues
« on: January 25, 2017, 03:50:42 PM »
My 1972 wagon has factory installed A/C. I have had an ongoing issue with the blower switch. The switch has the following positions: Off, Low, Medium, and High. The switch only works on high speed. The switch was replaced a while back and the lower speeds initially worked and then stopped. Where should I start looking for the cause? Today when I had the instrument cluster and radio out, I did a quick check of the wires and didn't see anything obviously disconnected or bare. The second issue is with the two dash vents and the floor vents. No matter where the vent lever is placed, the air only comes out of the defroster vents. I know that the issue is probably a vacuum leak as my 89 Burb had a broken lever clip in the vent box that I had to repair (Cheap plastic that dried in the Florida heat). Again, is there a good place to start checking? Any tips or suggestions would be appreciated.
*The Original Family Car: A 1972 Pinto Wagon*
Ordered by my folks from Bunnell Motor Company, Inc., Bunnell, Florida
Delivered: June 20, 1972
Entrusted to my care: August 1976

Offline pinto_one

  • Pinto Master
  • *****
  • Posts: 1001
  • FeedBack: +70/-0
  • Gender: Male
  • Pinto-One

  • Total Badges: 10
    Badges: (View All)
    1000 Posts Photographer Tenth year Anniversary Topic Starter Signature Poll Voter Mobile User Apple User Windows User Fifth year Anniversary
Re: 1972 A/C Blower Switch and Vent Issues
« Reply #1 on: January 25, 2017, 06:43:12 PM »
One the fan speeds you will have to check the fan resistor , it is a part that the fan switch plugs in and on side of the a/c unit inside the car , its held on by two screws and a plug in the middle that the wires go to the switch , the have coils that reduce the voltage for the fan on of them is broke or burned , you should see it in the front of the case , if you have air blowing out the defrost you have a vacuum problem , car that age may not have the hose hook back up , or the vacuum can is rusted out on the bottom , hope this helps , Blaine
76 Pinto sedan V6 , 79 pinto cruiser wagon V6 soon to be diesel or 4.0

Offline 1972 Wagon

  • Pinto Full Member
  • ***
  • Posts: 103
  • FeedBack: +27/-0
  • Gender: Female
  • 1972 Pinto Wagon

  • Total Badges: 3
    Badges: (View All)
    Mobile User Signature Topic Starter
Re: 1972 A/C Blower Switch and Vent Issues
« Reply #2 on: January 25, 2017, 09:05:35 PM »
Thanks for the suggestions Pinto_One! I just checked the vacuum canister hose that runs to the engine. The hose is a tad short and it had worked loose. When I thought about it, I realized that the Pinto was running a bit rough when I pulled it into the garage today. Problem solved! The vents are now working. Checking the blower resistor will be the next step.
*The Original Family Car: A 1972 Pinto Wagon*
Ordered by my folks from Bunnell Motor Company, Inc., Bunnell, Florida
Delivered: June 20, 1972
Entrusted to my care: August 1976