BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 A/C fan question

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MancheSSterJake

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Posts : 79
Join date : 2009-03-03
Age : 40
Location : Derry NH

PostSubject: A/C fan question   Thu Jul 18, 2013 10:47 am

I am trying to figure out if the axillary fan is supposed to come on when the A/C is on. My mechanic buddy tells me that it should but I dont believe so. He had the A/C gauges hook up and jumped the fan to come on. The upper pressures dropped when the second fan came on.

So my question is: Does anyone have both fans come on when the A/C is on Max? Or do I just get the smaller primary fan?

I know the second fan is set to come on when the engine temp gets to a certain point.

Thanks!
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MASShole9C1

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PostSubject: Re: A/C fan question   Sat Jul 20, 2013 3:16 pm

Ok, I just checked for you.

My AC on max, engine running, BOTH fans are on.
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MancheSSterJake

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PostSubject: Re: A/C fan question   Sat Jul 20, 2013 4:35 pm

The problem is that on the National forum they are saying that the second fan is only supposed to come on when the upper pressure in the A/C system hits a certain point.

The factory manual is hard to understand when it comes to the second fan, but it seems to confirm that the second fan should not come on until a certain point.

With a cold motor just started and the A/C switched to Max the system should not be built yet to high pressure yet. So that would indicate that the second fan would not be on.

So what I would need to know if the second fan is on with the engine just started.
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MASShole9C1

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PostSubject: Re: A/C fan question   Sat Jul 20, 2013 4:49 pm

Ok, what I've got is a semi warned up engine.

I just started it with AC on max.

Both fans on.

I turned AC off and the drivers side fan slowed to a stop.

FWI there's no "smaller fan". They're the same size and because of that, one is canted lower.
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MancheSSterJake

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PostSubject: Re: A/C fan question   Sat Jul 20, 2013 9:30 pm

I have a very original 95 Impala SS. The fans are different sizes. V03 option code. The primary fan on the passenger side is smaller. This is correct.
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MASShole9C1

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PostSubject: Re: A/C fan question   Sat Jul 20, 2013 9:37 pm

Strange... I have VO3 too.

Not sure what very original has to do with it. I rarely see anyone install aftermarket fans if that's what you mean.
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MancheSSterJake

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PostSubject: Re: A/C fan question   Sat Jul 20, 2013 9:50 pm

According to my factory manuals the fans are two different sizes on the V03.

I see yours is a Caprice police. They may have had different fans.
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MASShole9C1

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PostSubject: Re: A/C fan question   Sat Jul 20, 2013 10:00 pm

My FSM says your FSM is full of shit.

The only difference is motors. VO3 cars had a 150w and 240w respectively for the 2 fans.

Base models were 150w and 100w.

VO8 is 1 electric fan, one mechanical.

I think you're confused by the fan on the passenger side mounted lower in front of the AC pump.
Looks smaller.
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MancheSSterJake

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PostSubject: Re: A/C fan question   Sat Jul 20, 2013 10:10 pm

Perhaps I did not use the correct terminology. What I was referring to was the motors size, no the physical size.
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MASShole9C1

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PostSubject: Re: A/C fan question   Sat Jul 20, 2013 10:14 pm

Aha! There it is.

In that case, then you are correct, just as the FSM states the differences for the various RPO codes.
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