Question about 2002 Chevrolet TrailBlazer

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When I turn on defrost or air conditioner my motor loses power until the a/c or defrost switches off

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  • Chevrolet Master
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The AC does draw about 5 horse power so yes you will feel that, you can't have AC without the engine doing extra work.

Posted on Nov 26, 2012

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Posted on Jan 02, 2017

Molson02536
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SOURCE: when I turn on the defrost or the air conditioner,

Start with the simple and clean your throttle body with throttle body cleaner, pay attention to your IAC (Idle Air Control) valve passageway at your throttle body opening towards the back.
Carbon build up can cause your IAC to bind and not work properly which moderates your engine idle when any extra load has been put on the engine like tuning on the A/C a stop with the engine idling.
The only other issue that can cause this would be a failed A/C compressor and internal parts in the compressor is causing extra load to your engine. If tis is the case, your going to have to replace your A/C compressor and get the system flushed out and also replace the A/C accumulator (A/C line filter).
Simple test to see if your A/C fail is to place the Blazer in park and rev the engine to 2000 RPM, the compressor clutch should engage which sounds like it, and you should feel cold air thought your vents. No cold air with the clutch engaged would indicate a bad compressor.
Thank you for using fixya and good luck

Posted on Jun 14, 2010

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SOURCE: battery died after 6 years on my 2004 trailblazer,

Hi skibop,

After 6 years, I think your battery has likely outlasted it's true useful life. If the vehicle stalls out, does it start back up easily or does it have to be jump started? I would suggest having the charging and starting system tested. Several of the auto parts chains will offer this service for free as a tool to get customers to come into their stores. A bit of technical info for you. During a load test on your battery, the voltage should drop to NO LOWER than 9.75 volts on a minimal load of 250 amps. This would be considered a marginal battery. The alternator should charge no less than 13.0 volts (engine running).

The reason it would stall using the air conditioner and not the heat is because the AC compressor requires a lot of voltage to cycle the clutch, plus the fan inside the passenger compartment is an additional voltage draw on top of that. With normal heat, the air conditioning compressor doesn't come on, but when you request defrost the air conditioning compressor DOES come on.

Auto Tech36

Posted on Jan 08, 2011

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