Jump to content

Recommended Posts

Is it common for the vaccum type actuators to stop working on these trucks? I'm more familiar with the electronic type actuators found on the later Silverado trucks.

 

My grandpa's 89 S15 seems to blow most of the cold air out of the floor vents...It does seem to change from dash to defrost, but not matter which mode is selected, the majority is still coming from the floor vent.  On these 90+ degree days it takes a long time for the truck to cool down like this...

 

What should I check first? it seems these older vacuum type actuators and HVAC controls are hard to find replacements for.....unless I'm mistaken.

Link to comment
Share on other sites

Your truck is old enough to have dry rot in the vacuum powered rubber diaphragms, they are prolly leaking. I'd pull the seat out and drop or open the heater box under the dash and replace all the diaphragms.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Forum Statistics

    245.8k
    Total Topics
    2.6m
    Total Posts
  • Member Statistics

    333,234
    Total Members
    8,960
    Most Online
    Donald Dolan
    Newest Member
    Donald Dolan
    Joined
  • Who's Online   2 Members, 0 Anonymous, 721 Guests (See full list)



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.