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1999 GMC Jimmy Heat stay on hot all the time

Tiny
SNOWLOVER4U2005
  • MEMBER
  • 1999 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
The heat was blowing hot cold hot cold and you cound hear somthing in the dash turnning. Now it just blows hot air it stopped makeing the turnning noise. Something is stuck or broke. The deflector works I can change where the air blows out and change the speed of it. There must be a blend motor or something I cant find to test or replace. Thank you Dan
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Monday, March 17th, 2008 AT 7:24 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be an air mix/blend/mode doors problem binding or an actuator/vacuum problem-You need to get behind it and investigate what's up back there
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Monday, March 17th, 2008 AT 7:56 PM
Tiny
SNOWLOVER4U2005
  • MEMBER
  • 4 POSTS
I agree with you I am having a hard time finding. Do you know how or where to get at this? Is there a pic on line some place to look at it. I joind the Mitchell1. Com site where you can view service manuals but it shows it as one big assembly.
Thank you Dan
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Tuesday, March 18th, 2008 AT 8:07 AM

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