Question about 2002 Chevrolet Suburban 2500

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1994 suburban knocking noise coming from heating system down by passenger feet when key is turned on lasts for about 10-15 seconds. same when key is turned off. heat and a/c work fine though after running a/c the heating system sounds like a coffee purculator and will burp anti freeze from under vehicle. Soleinoid????

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  • Contributor
  • 27 Answers

Check your heater core. your heater core is going bad.

Posted on Feb 02, 2018

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Posted on Jan 02, 2017

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SOURCE: Interior A/C

get it checked by someone with a license to handle the chemicals. please email me at meanness628@aim.com with any other info or questions

Posted on Sep 30, 2008

  • 45 Answers

SOURCE: heat will not blow down by my feet

Hi: On the back of the heater control unit are vacuum lines, make sure plug is firmly attached. FIRST though check if vehicle does not go into 4WD high. If not then you probably have a vacuum problem under the hood as vacuum controls heater, 4WD and other functions. Check to make sure vacuum lines under the hood are all attached starting with the vacuum pod (located in front L fender by brake module.) and chasing them under the hood. If you have vacuum then check heater control module and lastly heater door vacuum actuators. Hope this helps.

Posted on Feb 26, 2009

ButtFuzz
  • 463 Answers

SOURCE: no floor heat

Many vehicles have a vacuum actuated valve (or flap) internal to the console vent plumbing. The vaccum line going to this valve/vac solenoid may be bad, unhooked or not functioning. In GM products, IIRC, the vac lines inside the vehicle are made of hard plastic, off-white in color (some have a slight green tinge) and are not easily flexible.

Check down under the dash where the floor output is and see if you see some of the plumbing of which I write. Then check to see if there are any loose lines, etc.

Posted on Mar 04, 2009

catbob007
  • 70 Answers

SOURCE: blowing hot

something fell down defrost vent

Posted on Jul 27, 2009

  • 3 Answers

SOURCE: Driver Heated Seat 03 Suburban

Identical thing here with my '03 Surburban LT.

Posted on Aug 02, 2009

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