Question about 2003 Chevrolet TrailBlazer

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Hi - I own a 2003 and when I turn on the AC or the heater the engine begins to stall so I turn those things off and the engine sounds fine. What could the problem be? The car has 116,000 miles on it.

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Dirty , loose or damaged battery cables, alternator not functioning properly. Battery poor.

Posted on Jun 19, 2009

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Why is there a clicking noise under dash near heater?


Classic symptoms of your battery being disconnected for what ever reason. The clicking is your vent actuators that are now bad (happens on occasion when the battery is disconnected). The engines stalls when you turn your DEFROSTER on right, not necessarily the heater. You'll find the stalling when you turn your defroster on OR your A/C. To fix this problem, disconnect the battery again, and clean your throttle body, this will cost you only a can of Seafoam spray about $8 to fix. Hook the battery back up after clean, drive around with HVAC all on OFF!! The computer will relearn the newly cleaned TB and your stalling problem will go away. Fouled spark plugs are a seperate problem. Make sure you're running AC Delco 41-103 plugs. The I6 engine loves these.

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THE DEFROST SETTING CALLS FORE THE AC COMPRESSOR TO ENGAGE TO DRY THE HUMIDITY. THE CAR IS STALLING PERHAPS BECAUSE OF THE LOAD PUT UPON THE ENGINE BY THE ENGAGEMENT OF THE AC COMPRESSOR. THE COMPRESSOR MAY BE LOCKED UP

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hi

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Engine stalls- this is because the when the car is off and when AC is on the AC runs in battery. When you try starting the car the starter motor takes power from the battery. it doesnt have enough battery power t o starts thats why it stalls.

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The engine dies when the ac/heater switch is turned on .


sounds like eithor the batery is on it's way or the alternator can no longer hold the load
have mechanic do a load test on battery and check alt

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Try disconnecting the battery (both terminals and let set for a few hours) with ALL the accessorries on lights-heater-radio etc. This will draw all power from your system, then recconnect battery, it's worth a try even if it doesn't solve your problem. Bill

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