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Welcome to FordPinto.com, The home of the PCCA => General Help- Ask the Experts... => Topic started by: 1972 Wagon on January 25, 2017, 03:50:42 PM

Title: 1972 A/C Blower Switch and Vent Issues
Post by: 1972 Wagon 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.
Title: Re: 1972 A/C Blower Switch and Vent Issues
Post by: pinto_one 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
Title: Re: 1972 A/C Blower Switch and Vent Issues
Post by: 1972 Wagon 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.