Climate Control Troubleshooting

[Tinyface]

I'm trying to get my Ac working on my 1986 El Camino, I've traced the issue down to the control part of it (the part that you change to get vents defrost hot/cold air ect.).
I'm getting:

• A sucking sound on the right side with the wheel the changes where the vacuum goes
• Defrost is the only setting that's ever on even though other setting are used
• I do get some heat on the floor when driving with the ac on (the ac does blow cold when it needs a few minutes, old car and all that).
• A little bit of air flow when I hold my hand under the thermostat when I had it out last night

So my question is: what should I be checking to pin point the issue? I'm trying to replace as little as I can since the outside of the control is in pretty good shape. And also any advice anyone would like to give would be nice I'm really new to working on cars.

Thanks in advance.

 

[383_StealthRam]

I highly recommend you follow the diagrams, troubleshooting hints and system operation information from the following post.

Post in thread 'Airflow thru vents'

Aug 30, 2024

Have a look at the following post, assuming your blower motor is working fine (electrically) at all the speeds through the resistors, and the high blower relay, then you should go through the vacuum and air flow troubleshooting steps to determine what might be wrong.

Note, there's also the possibility that you have a lot of build up dirt on the the heater core, and/or evaporator core that is hindering air flow from blower motor from getting to the inside HVAC box. Also, you could have a lot of air leaking from dried out or missing foam seals around the plastic ductwork behind the dash...

• 383_StealthRam

• 

 

[BlairC_789]

The leaking is probably from the black maize like disc. You can find them in the junkyard in alot of gm vehicles in various years. Or it needs a bit more pressure applied to it to make it seal better