HomeHome  PortalPortal  CalendarCalendar  GalleryGallery  FAQFAQ  SearchSearch  RegisterRegister  Log in  

Share | 

 Temporary loss of air flow inside cabin

Go down 

Posts : 127
Join date : 2011-05-22
Location : California

PostSubject: Temporary loss of air flow inside cabin   Fri May 26, 2017 8:01 pm

My new-to-me '93 is my daily driver and I run the AC almost every day in stop-n-go and short freeway driving with no issues.

But on my first long trip (SD to LA) somewhere between 50 and 100 miles in, I suddenly noticed there was no air flowing through any of the vents (dash, floor nor windshield). As I usually do, I leave the fan speed set to its lowest setting when at highway speeds. I stuck my little finger inside the vent and could still feel cold air seeping through (AC system still working). Naturally, I turn the fan speed up and can then hear air blowing around inside the dash...kinda sounded like a wind tunnel...but still nothing coming into the cabin. I slid the selector all the way to off until I reached a rest area. As I was coasting into the area, I re-engaged the AC and by the time I parked all was working normally again. Back up on the freeway, I'm guessing another 50 miles, problem returned.

I had something somewhat similar happen with my '87 CE and that turned out to be a vacuum leak. But do I understand by '93 the ventilation system was electrically controlled rather than by vacuum? Anyone ever experience this and have an idea what my issue might be? Thanks in advance!
Back to top Go down
Fred Kiehl


Posts : 4952
Join date : 2009-11-13
Age : 70
Location : Largo, FL 33774

PostSubject: Re: Temporary loss of air flow inside cabin   Fri May 26, 2017 8:48 pm

Since you have the Caprice, it has a manually operated heater valve. The rest is vacuum controlled. Check your "mode" actuator valve. It is the only one with the two hoses to it. The multi vacuum connector or hose from it could also be your issue. Check for flow from the bottom "heater" vents when it is not blowing air from the dash vents. If you are getting airflow from them your mode valve is not functioning properly.
Back to top Go down
Rev Bob

Posts : 241
Join date : 2016-05-24

PostSubject: Re: Temporary loss of air flow inside cabin   Sat May 27, 2017 9:17 am

Was this in AC mode? Your evaporator might be icing up due to low charge or bum pressure switch.
Back to top Go down
Sponsored content

PostSubject: Re: Temporary loss of air flow inside cabin   

Back to top Go down
Temporary loss of air flow inside cabin
Back to top 
Page 1 of 1
 Similar topics
» Inside Spanish Football helping to find Amy
» Baby Locked Inside Day Care Center Alone
» Facebook quick link app - have your forum inside Facebook window
» How to show the avatar of the last poster of a topic inside a forum?
» The Color Inside The Theme

Permissions in this forum:You cannot reply to topics in this forum
GM Longroof Forum :: Longroof Tech :: Heating and Air Conditioning-
Jump to: