64 AC : Blower runs, air is felt at firewall, but not through heater outlets or AC vents (HEAT/AC door WORKS)

Hello All.

As I am getting in to this troubleshooting with the benefit of Tim Groves invaluable book, I find something that is not covered; blower works strongly but no air can be felt either at heat ducts or AC ducts even though the Heat/AC mode door DOES WORK when I apply vacuum to the solenoid that controls it. (thanks to Tony and Ginny 429 for clueing me in to what panel to remove to observe the door). 

As luck would have it, I have buddies who own a MOPAR junkyard and one time they took in a 64 CDV with AC. So I managed to get some parts off of it to practice on and to use. I got what turned out to be a good Transducer and installed it, so now when I run the temp wheel the Power arm moves from AC to heat and changes the blower speed. HOWEVER, nothing comes out of anywhere even though I can hear the blower working hard AND I can feel a STRONG rush of air all the way in the back near the firewall. I had thought what I was feeling was the INTAKE for the blower with the RECIRC door stuck open (solenoid inop), but now I am not so sure. 

When I stick my hand inside the heat/ac blend door I can feel that something is flowing, but not alot; it sounds/feels like there's lots of air moving, but not in the right direction. 

Stumped!

All replies welcome, thanks.

Norm

Facebook Facebook

Views: 774

Reply to This

Replies to This Discussion

this was the project. It included the whole comfort control system, electric fans and shroud, transmission cooler electric fans, fitech fuel injection and some paint under hood. Also all new rubbers and insulation under there as well.

Have not taken the inspection plate (inner fender well) off yet, but noticed something: The heater/AC brown vacuum hose from the control unit nipple is not giving vacuum to the solenoid that operates the door. When I give the door solenoid vacuum, it works fine. So, I need to take the 7 nipple valve body out of the control unit and replace it with a spare I have that I think works ok. BUT: How do I remove that friction clip that holds the valve body on to the peg-without ruining it, so I can use it again when I put the replacement valve body on?

Norm, are you sure the rotary valve is getting vacuum?

RSS

Photos

  • Add Photos
  • View All

Forum

Bleeding brakes

Started by Dave Fehrle in 1963/64 Cadillac Specific Discussion. Last reply by Tony Prichard 5 hours ago. 4 Replies

I have finished replacing all the rear suspension and am at the last item, which is bleeding the rear brakes. I am using the Jason Edge vacuum pump method and all went well with the rear passenger…Continue

Power steering fluid

Started by Bobby Brown in General Discussion. Last reply by Tony Prichard 5 hours ago. 7 Replies

My reservoir is a little low. Any recommendations on my purchase of refill fluid? There are likely new fluids and I’d like to buy the right product. Thanks. Continue

1963 AC evaporator core leaking?

Started by Mark Geertsma in 1963/64 Cadillac Specific Discussion. Last reply by Kenneth Barton yesterday. 2 Replies

Hi all,Again I have issues with my AC system. Had it refilled recently but within a few days the system was empty again. The AC mechanic added tracer fluid to check for leaks, but there are no…Continue

Tags: 1963, core, evaporator, AC

seat foam replacement

Started by Kevin Robles in 1963/64 Cadillac Specific Discussion. Last reply by Kevin Robles on Wednesday. 3 Replies

does anyone out there have any experience with seat foam replacement on  a 63/64 Cadillac.  I had my seats reupolstered  many years ago in original leather/fabric and they still look great, but the…Continue

Blog Posts

1963 RHS A/C kick panel - photos needed

Posted by SK on June 2, 2025 at 2:20pm 2 Comments

Could someone post front and back photos of the 1963 right-hand kick panel with A/C?

My car didn’t come with the original kick panels, so it's a bit of a mystery to me how I should cut the backing board and carpet to fit around the A/C.

Many thanks,

-Samu

Edelbrock Carb Block off Plates

Posted by Chase on March 12, 2025 at 2:05pm 14 Comments

Hey guys,

I have installed the same Edelbrock carb and have done everything the same as Jason’s carb and intake project. In the spring and summer months the car starts, runs and idles great! In the fall and winter months on a cold start, the car starts awful and wants to die until it warms up. I have to keep my foot on the throttle until it warms up or it will idle just terrible and try to die. Once it’s warm, it runs fantastic! Whats going on here? I was thinking of removing the…

Continue

'63 Tailfin Tales

Posted by Mark Mata on February 22, 2025 at 5:00pm 9 Comments

New old stock seat material

Posted by Ray Schick on August 22, 2024 at 6:25pm 2 Comments

I bought this seat material thinking that it’s…

Continue

Videos

  • Add Videos
  • View All

© 2025   Created by Jason Edge.   Powered by

Badges  |  Report an Issue  |  Terms of Service