A/C vents

Hi,

The air flow directions is controlled with engine vacuum. You may have a small leak. Do me a favor. When driving, pay attention when climbing a steep hill if the problem gets worse.

I attached a pic below (it's confusing) and circled the vacuum actuator that may have a leak. These things are under the dash. See if when the car is at an idle if there is a hissing sound coming from around that area or anywhere under the dash.

Let me know.
Joe

I will check that in the morning, however I cannot make heads or tails out of that diagram.. I'm not sure which end is up/down left/right in that picture... I'll start it up and listen real carefully for the vacuum leak and hope it's not near impossible to reach...
I'll let you know what I find. Thanks for the heads-up.

Well guys, I gave it shot.. listening for any possible vacuum leak sounds in, around, under the dash.. fan on low, mid, high.. A/C on, off. engine on, off.. I couldn't get a read on anything sounds or otherwise. My hearing may be getting about as bad as my eyes now. Any other method I might use to locate the leak?

No problem. The leak could actually be under the hood and causing the pressure to lower to the HVAC. Here is a link that explains how to check for a leak:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let me know if you find anything.

Joe

Hey guys,

Sorry I haven't been on this page for a couple of weeks. been busy.. Anyway, with regard to my car with the A/C issue.. It's extremely hot here in the southwest and my A/C is at best providing me with 80%, what with the two middle vents being redirected to the defrost vents. whew! I tried to find any vacuum leaks but I haven't been very successful, but I did find this; when I attempted to redirect the flow of air via the different settings on the dash by pushing the button.. the little arrows would point to the different possible vents properly, but the air never redirected to anything except where it was already coming out. I suppose I'm lucky that it didn't decide to alternate to the heater vents and then get stuck there. I'd be even worse off. Is it possible my problem lies within that unit in the dash? Or??

Hi,

It could be the unit, but before we jump to that, there is a switchover valve behind the glove box. The switchover valve block supplies the vacuum for actuation of the vacuum elements for flap control. I attached a pic below of it. Check to make sure there are no leaks at the block.

Joe