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2002 Cooling Fan Issue with AC on

 
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Chevy_Rick
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2002 Chevrolet Impala
2004 Chevrolet Suburban
2005 Chevrolet Silverado


PostPosted: Wed Apr 23, 2014 10:09 am    Post subject:  2002 Cooling Fan Issue with AC on Reply with quote

2002 Chevy Impala with 3.4L.

Both cooling fans work fine according to the engine temp, as long as the AC stays off.

Turn AC on, 2nd fan comes on, but shuts off after a few seconds and Vehicle overheats if you keep running the AC. AC is fully charged, checked fuses and everything appears fine.

Found a Chevy Tech Bulletin from 2009 that claims if you disconnect the BCM and the fans come on, the problem is the BCM.

BCM is pretty expensive, and before I shell out that kind of money, wanted to know what others thought first.

No codes and hooking up a diagnostic tool to the car, everything checks out fine.
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ZSPOT
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PostPosted: Wed Apr 23, 2014 12:29 pm    Post subject:   Reply with quote

If I remember right, there are two cooling fan relays. Both I believe are the same relay. Try swapping those first and see if anything changes.

By overheating, you mean the temp gauge goes clear to the hot side and the 2nd fan never kicks on?

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Chevy_Rick
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2002 Chevrolet Impala
2004 Chevrolet Suburban
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PostPosted: Thu Apr 24, 2014 12:47 pm    Post subject:   Reply with quote

Correct, when the AC is on, the 2nd fan does not come on and the engine temperature shoots up to the red overheat zone.
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Frank
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PostPosted: Fri Apr 25, 2014 2:18 am    Post subject:   Reply with quote

IIRC, one of the fans on the non-9C1 model is higher output than the other fan (the 9C1 has two high output fans) The AC-on condition may cause the higher output fan to turn on which may be shorting out and shutting down or doing something else strange (bad relay or maybe tripping a breaker if it's not on a fuse). Something to think about as Z suggested.

I had something funky going on with my fan years ago...I think the motor was wearing out, causing the fan blades to rub on the shroud. As I have the two high output fans on my car, I simply used my Powrtuner to swap the parameters for the fans around so the squeaky one didn't come on unless the temperature got really high and the other fan became the primary. That was a quick and dirty fix until I could get around to getting a new assembly in.

If you end up going aftermarket, the Dorman fans should have a LLT warranty, and I believe the motors themselves are individually replaceable down the line if one of them craps out. If you know someone with a tuner that could help you diagnose the problem as well.

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mikelbeck
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PostPosted: Sun Apr 27, 2014 2:40 pm    Post subject:   Reply with quote

I showed up here today to ask a question about the same thing, I'm having an similar issue with my wife's 2003/3.4L.

When the A/C is on the 2nd fan (passenger side) turns on for a few seconds and then shuts off, the temperature continues to climb as long as the A/C is on. How is this fan supposed to operate normally? I thought when the A/C is on that fan was supposed to stay on continuously, is that correct?

Chevy_Rick were you able to fix your problem or figure out what was causing it?

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9C3
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PostPosted: Sun Apr 27, 2014 7:20 pm    Post subject:   Reply with quote

Yes. At least on my car, even when the engine is ice cold, when I turn on the A/C, both motors spin as long as the A/C stays on. GARY

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mikelbeck
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PostPosted: Mon Apr 28, 2014 12:38 pm    Post subject:   Reply with quote

9C3 wrote:
Yes. At least on my car, even when the engine is ice cold, when I turn on the A/C, both motors spin as long as the A/C stays on. GARY


Mine isn't doing that, and it sounded like Chevy_Rick's wasn't either.

What could be the issue here? The BCM like Chevy_Rick mentioned initially or something else? Relays maybe?

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