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Heater and rev problem

3K views 4 replies 2 participants last post by  Pollotrablzrlov 
#1 ·
I have a 2002 trailblazer and today I turned on let it warm up and turned the heater on and noticed it went from .6 rpm to .3rpm and kept on doing that going down and then up after it started it turned of (the engine) so I turned back on and tried it and same thing just that I turned the heater off and the engine stayed on. So what could it be I went to all the auto parts in city and all said they have never seen that before!
 
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