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02 Chevrolet Trailb...
 
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02 Chevrolet Trailblazer idling funky when the heater is on

  

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Hey, Scotty 

just recently my trailblazer started idling funky, but only when the heater is on. No codes pulled up on the scan tool, what would you suspect 


1 Answer
1

do the lights dim at the same time?


Yes, I placed a new battery to see if that corrects the problem and it didn’t


the battery only starts the engine. The alternator is what powers everything.


Yeah, possibly a bad alternator. Had a Beretta that would die when I turned on the headlights and air at the same time lol, was the alternator.


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