Can the cooling fans be swapped side for side? - Chevy Impala SS Forum
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post #1 of 25 (permalink) Old 04-08-2016, 01:18 PM Thread Starter
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Can the cooling fans be swapped side for side?

While trying to track down what I thought was a misfire at high temps , I happened to have my hood open one day when my primary fan kicked on. As it turns out, the primary fan blade is horribly, ridiculously out of balance. The primary fan was replaced at some point with an aftermarket one. The blade doesn't wobble forward and backward so it's not loose on the motor shaft, but it wobbles up and down almost 1/4". It's enough that I can feel it shake the car enough that it feels like a misfire. Since the secondary fan almost never comes on and runs smooth when it does, I'd like to swap the primary and secondary fans. At this point in my '95's life, I don't have much confidence that I'll be able to get the motors out without breaking the screws. I'm wondering if I can just unbolt the fan assembly and flip it around, or if it only goes on one way so I have to try to swap the motors and blades in the frame. Thanks for the help.

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post #2 of 25 (permalink) Old 04-08-2016, 05:45 PM
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Why not simply switch the power leads in the connector,and let the fans stay where they are. Or,switch the fan blades with each other. Believe they're the same...

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post #3 of 25 (permalink) Old 04-09-2016, 04:00 AM
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I get this nagging feeling I've read that the two fans are rated different wattages power - the primary slightly higher. Maybe a guy posted replacing his secondary with a primary model for that extra oomph?

I noticed the secondary in my Cady ain't free-wheeling quite right, so I'll have to start researching a bit on replacements.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!
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post #4 of 25 (permalink) Old 04-09-2016, 08:35 AM
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The fans are different wattages. You can not swap them. You can get a replacement at the local junk yard from any 94-96 B or D body with dual fans. It is a cheap and easy fix that is going to work like it is supposed to. If there aren't any junk yards near you, maybe someone can get one for you.

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post #5 of 25 (permalink) Old 04-09-2016, 09:52 AM
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Well this came up quick
https://www.impalassforum.com/vBullet...an-motors.html

It turns out I'll be replacing the higher rated fan of the two after all.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!
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post #6 of 25 (permalink) Old 04-09-2016, 11:44 AM
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Quote:
Originally Posted by Fred Kiehl View Post
The fans are different wattages. You can not swap them. You can get a replacement at the local junk yard from any 94-96 B or D body with dual fans. It is a cheap and easy fix that is going to work like it is supposed to. If there aren't any junk yards near you, maybe someone can get one for you.

That is not true for all cars. At some point they stopped using motors with different wattages at least on certain cars. My car, a May '95 9c1, has 2 identical 100W motors.

Jim B.

'95 9c1, pcmperformance.com 93 tune, Dynomax Ultraflo catback, K & N box filter, LT4 KM, 160 stat, 3.08 Posi.
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post #7 of 25 (permalink) Old 04-12-2016, 12:45 PM Thread Starter
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Thanks for the replies. My primary fan looks like a replacement motor so who knows what wattage could be. It seems to work well enough, except for the vibration. I'll pull the fans off and see what there is to see.

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post #8 of 25 (permalink) Old 04-14-2016, 12:29 PM
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Quote:
Originally Posted by fbi9c1 View Post
That is not true for all cars. At some point they stopped using motors with different wattages at least on certain cars. My car, a May '95 9c1, has 2 identical 100W motors.
Just offering yours may have been potential victim of a little clandestine swapping at a garage. But, in your defense if you look at the pic illustrations on the AZ site they ALMOST look like they're showing the same sized motors for both sides.

I just picked up what is supposedly (but falsely) listed as the replacement for my Cady's secondary fan. Counter to 5 decades worth of experience I neglected to take the old one in to compare at the counter. But in my defense the listing was pretty dam clear and straightforward and matched the number from the other linked thread ----- so my radar was down:

1995 Cadillac Fleetwood Brougham 5.7L SFI OHV 8cylVDO/Radiator Fan Motor,
Part Number: PM540 Fits Your Vehicle
VDO/Radiator Fan Motor
Application: Driver side
Without heavy duty cooling


There's two other options listed: the "passenger side" with a different part #, different price and different picture. And, there's something listed for "with heavy duty cooling", with a different part #, different price and different picture. Never mind there's no such thing as an electric fan for the belt-driven mech. fan with the towing package for our cars, which is what I figured was a simple flub-up.

Well, it turns out I DO have what's labeled "heavy duty cooling" since that's the fan I need:
VDO/Radiator Fan Motor
Part Number: PM9040
Warranty: Limited Lifetime
Application: With heavy duty cooling
Notes: O.E.M. #22137220


It turns out my SS has this so-called "heavy duty cooling" on the driver's side too. It obviously has nothing to do with a towing package. The motors on both cars are physically different side-to-side and no way close to the same mounting, in line with what Fred said. I hope this saves the OP and others a little aggravation someday.

Rock Auto will have the right one here Tuesday.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!
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post #9 of 25 (permalink) Old 04-14-2016, 01:30 PM
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"Just offering yours may have been potential victim of a little clandestine swapping at a garage. But, in your defense if you look at the pic illustrations on the AZ site they ALMOST look like they're showing the same sized motors for both sides."

No, there hasn't been any clandestine swapping. What I said is correct. On some models, the factory decided the larger motors were not necessary and both motors became 100w. I am the second owner of this car, the first being the federal gov't. and I am well aware of the history of 9c1s. I don't need a defense since I gave correct information. Your being unaware of it doesn't mean it is wrong.

Jim B.

'95 9c1, pcmperformance.com 93 tune, Dynomax Ultraflo catback, K & N box filter, LT4 KM, 160 stat, 3.08 Posi.
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post #10 of 25 (permalink) Old 04-14-2016, 02:20 PM
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Just looked through GM B-body parts catalog.

It calls out one unique RH motor, different than any LH. Then 4 different LH motors depending on year and options.
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