GM Longroof Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.



 
HomeHome  PortalPortal  GalleryGallery  SearchSearch  RegisterRegister  Log in  

 

 A/C and Heat stops blowing

Go down 
AuthorMessage
Bilwit



Posts : 18
Join date : 2021-01-23
Location : CT

A/C and Heat stops blowing Empty
PostSubject: A/C and Heat stops blowing   A/C and Heat stops blowing Icon_minitimeMon Jan 25, 2021 11:06 am

I am new to the forum so hope I post this correctly and explain well. I have a condition that seems similar to others posted though not sure its identical. Recently bought a '96 RMW. In the summer the A/C blew cool and well. But when it get to temp and stabilizes on Auto fan slows down as it should. This maybe takes an hour or so. Cabin starts to heat up but no change in A/C fan. Increase speed manually and can hear the fan working but no air seems to come out of vents. Only a bit of leakage. Its like the doors/dampers are not opening. Not sure if its a control issue or something with the doors. And this car does radiate heat with the large windows and deep dash. Can feel the heat coming off the dash. Now its the same with the heat but through the bottom vents. Takes a while as it blows well until it gets to set temp and stabilizes. Then it doesn't respond to changing to manual control or changing the temp setting. Runs well around town but this occurs on longer trips of around an hour or more. Perhaps I need to log the details more accurately. My daughter has also noticed the same situation when she has driven it on longer trips. Anyone have any ideas? I have mentioned it to the mechanic where I have had it serviced but want to bring it in when its has this condition and I don't drive it long often. Welcome any guidance or suggestions. Seems to me its either in the control unit or the doors get stuck temporarily. Are there tests I can run? Thanks.
Back to top Go down
Fred Kiehl

Fred Kiehl

Posts : 5805
Join date : 2009-11-13
Age : 72
Location : Largo, FL 33774

A/C and Heat stops blowing Empty
PostSubject: Re: A/C and Heat stops blowing   A/C and Heat stops blowing Icon_minitimeMon Jan 25, 2021 10:57 pm

If you let the auto AC head restart (pull the fuse, or disconnect the battery), it will go through a couple of time sequences. After the fan starts, the book says to run the temp full up and full down to calibrate the system.
Back to top Go down
Bilwit



Posts : 18
Join date : 2021-01-23
Location : CT

A/C and Heat stops blowing Empty
PostSubject: Re: A/C and Heat stops blowing   A/C and Heat stops blowing Icon_minitimeTue Jan 26, 2021 8:36 am

Thanks I will try it.
Back to top Go down
Sprocket

Sprocket

Posts : 5790
Join date : 2008-11-04
Location : Palm Beach County

A/C and Heat stops blowing Empty
PostSubject: Re: A/C and Heat stops blowing   A/C and Heat stops blowing Icon_minitimeTue Jan 26, 2021 9:33 am

sounds like the blend doors aren't opening again like they should.   Try what Fred said, and when you get a chance go on ebay and buy the correct year factory service manuals.  there are troubleshooting flow charts to follow for a number of things, so pretty sure the HVAC system would have one. They are available on Ebay usually. You can get a set for well under $100 esp, if patient.

Then blend doors are vacuum actuated so you might be loosing vacuum and then they don't work right but I'm no expert on them
Back to top Go down
Bilwit



Posts : 18
Join date : 2021-01-23
Location : CT

A/C and Heat stops blowing Empty
PostSubject: Re: A/C and Heat stops blowing   A/C and Heat stops blowing Icon_minitimeTue Jan 26, 2021 9:44 am

Thanks for the info. I will look for the manuals.
Back to top Go down
Sponsored content




A/C and Heat stops blowing Empty
PostSubject: Re: A/C and Heat stops blowing   A/C and Heat stops blowing Icon_minitime

Back to top Go down
 
A/C and Heat stops blowing
Back to top 
Page 1 of 1

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