GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 4 of 4
  1. #1
    Jr. Mechanic LoneWolf'burban's Avatar
    Join Date
    Apr 2010
    Location
    Ozarks
    Posts
    112
    Blog Entries
    1

    Default Heater Core Clogged

    Is there a way of unclogging a heater core without removing it from the truck?
    1992 GMC Sonoma GT 4.3
    1984 C20 'burban 454
    1963 C10 283
    One lead foot
    Two hands that turn a steering wheel very quickly and very well.

  2. #2
    Legend
    murdog94's Avatar
    Join Date
    Feb 2008
    Location
    Cloquet, Minnesota, United States
    Posts
    8,198
    Blog Entries
    12

    Default

    Year, make, model? and you can try the radiator flush stuff, and another thing that i have done in the past (most likely not recommended but i did it anyway) is with the flush stuff in the radiator reverse the heater core lines. Also you can try just back flushing the heater core as well.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  3. #3
    Jr. Mechanic LoneWolf'burban's Avatar
    Join Date
    Apr 2010
    Location
    Ozarks
    Posts
    112
    Blog Entries
    1

    Default

    84 Chevy burban. I was thinking the same thing. I apreciate the help. Need to find a small bottle of the flush stuff. Maybe even using some soft wire to see if the clog was close to one of the ends of the core. Something like a tripled strand of solder so I don't poke a hole in it. Radiator stop leak products seem to be a double edged knife here...
    1992 GMC Sonoma GT 4.3
    1984 C20 'burban 454
    1963 C10 283
    One lead foot
    Two hands that turn a steering wheel very quickly and very well.

  4. #4
    Legend
    murdog94's Avatar
    Join Date
    Feb 2008
    Location
    Cloquet, Minnesota, United States
    Posts
    8,198
    Blog Entries
    12

    Default

    Yep i wont use anything for radiator stop leak, except i keep a bottle in my hunting truck so when im 70 miles from the middle of nowhere i can at least limp home.
    and i very highly doubt the clog is close your finns are all clogged up in you used rad stop leak.. get a large jug of the rad flush stuff from your parts store and you may have to flush it twice
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

Similar Threads

  1. Can someone tell me whats going on with the heater core?
    By Jibsta in forum General Chevy & GM Tech Questions
    Replies: 8
    Last Post: 02-22-2010, 08:38 AM
  2. Heater Core Replacement
    By dekanfrus in forum General Chevy & GM Tech Questions
    Replies: 8
    Last Post: 12-18-2009, 09:09 AM
  3. Condenser Box or Heater Core?
    By c_m_chance in forum General Chevy & GM Tech Questions
    Replies: 3
    Last Post: 07-28-2009, 03:51 PM
  4. Pulling the heater core
    By Crawdaddy in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 21
    Last Post: 03-25-2009, 07:59 PM
  5. Heater Core Replacement
    By mb73 in forum Chevy Trailblazer Forum (GMC Envoy)
    Replies: 8
    Last Post: 01-11-2007, 09:30 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •