Upgrade/Replace HVAC Controls W/Newer 4-Speed Fan CTRL? - Chevy Impala SS Forum
 
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post #1 of 5 (permalink) Old 05-28-2019, 01:23 PM Thread Starter
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Upgrade/Replace HVAC Controls W/Newer 4-Speed Fan CTRL?

Hey Guys,
We're getting into the warmer weather down here in Texas, and having the A/C on is now a daily occurance, and it got me thinking about the fan control.

I've also got a '98 Tahoe which has a very similar layout of the HVAC section, but with the fan speed selector having 4-positions.

It's one thing that has always bugged me about our cars, is the lame 3-speed setting. Going from MAX to #2 is a BIG jump, and there should be more air moving IMHO.

So that leads to the question of this post, has anyone ever changed the HVAC controls from stock, to some other vehicle with a 4-speed fan control?

Thanks!

Clear Image Tri-Ys & Hi-Flow cats >> 2.5" X-Pipe & Magnaflow Tri-Chambers, Mike Harris 4L60E, Circle-D 2,400 RPM TC, All MOOG FT End & Del-A-Lum bushed MOOG CTRL Arms, Eibach FT & New Stock HT rear springs. Hotchkis Sway Bars & End Links, RAISS, 3.73 Gears in Eaton carrier, Dynoshaft & CIA Loop, BMR Trailing Arms, Braided Brake Hoses, Taylor Spiro-Pro Wires, AutoMeter Water Temp & Oil PSI Gauges, Impala Console. ATE Blue Brake Fluid. Skip White distributor. 20's, Z28 Cluster, Corbeau GTS Seat
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post #2 of 5 (permalink) Old 05-28-2019, 02:25 PM
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Quote:
Originally Posted by juniorwatson View Post
Hey Guys,
We're getting into the warmer weather down here in Texas, and having the A/C on is now a daily occurance, and it got me thinking about the fan control.
I've also got a '98 Tahoe which has a very similar layout of the HVAC section, but with the fan speed selector having 4-positions.
It's one thing that has always bugged me about our cars, is the lame 3-speed setting. Going from MAX to #2 is a BIG jump, and there should be more air moving IMHO.
So that leads to the question of this post, has anyone ever changed the HVAC controls from stock, to some other vehicle with a 4-speed fan control?
Thanks!
1st, to answer your query, no I have not.
2nd, we already have a 4spd fan.
Quote:
Originally Posted by B Carline Service Manual
Blower Motor Speed Control
With the ignition switch in the "RUN" position, the blower motor assembly runs in all mode control positions, except "OFF".
Blower motor assembly speed is controlled by a four-position electrical blower motor speed control switch at the left side of the control assembly.
The blower motor speed control switch provides a choice of a low blower motor speed, two medium speeds, and a high speed.
Technically, that makes "OFF" the 5th choice.

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post #3 of 5 (permalink) Old 05-28-2019, 02:40 PM Thread Starter
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Okay, I guess I'm partially losing it, as I musta been thinking about my older vehicles with the 3-speed fan control when I wrote this.

You're right, and I know, that the speed is controlled by the resistor assembly.

I'd really like to modify that, to have greater fan speed, and that should have been my question, not the HVAC controls itself.

Wondering if anyone has played around with swapping resistors out?

Wel lnow I just looked on RockAuto at the images for both vehicles, and it looks like the receptacle is the same. I may do some tinkering around and see if the Tahoe will work with the Caprice...

Clear Image Tri-Ys & Hi-Flow cats >> 2.5" X-Pipe & Magnaflow Tri-Chambers, Mike Harris 4L60E, Circle-D 2,400 RPM TC, All MOOG FT End & Del-A-Lum bushed MOOG CTRL Arms, Eibach FT & New Stock HT rear springs. Hotchkis Sway Bars & End Links, RAISS, 3.73 Gears in Eaton carrier, Dynoshaft & CIA Loop, BMR Trailing Arms, Braided Brake Hoses, Taylor Spiro-Pro Wires, AutoMeter Water Temp & Oil PSI Gauges, Impala Console. ATE Blue Brake Fluid. Skip White distributor. 20's, Z28 Cluster, Corbeau GTS Seat

Last edited by juniorwatson; 05-28-2019 at 02:44 PM.
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post #4 of 5 (permalink) Old 05-29-2019, 06:43 AM
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If your fan motor doesn't blow to your satisfaction and is original,
replace it with a new one and I'll bet you'll feel an improvement

Nab
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post #5 of 5 (permalink) Old 05-29-2019, 07:47 AM Thread Starter
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Quote:
Originally Posted by Blue Wail View Post
If your fan motor doesn't blow to your satisfaction and is original,
replace it with a new one and I'll bet you'll feel an improvement

Nab
No that's not it. However, I have replaced it with a donor from Scott William's 9C1.

It's just that there's a drastic reduction in speed from MAX to the 3rd setting. I'd like to have more air moving thru the cabin is basically what this boils down to.

I'm going to try the Tahoe blower motor resistor pack, and see how that works tomorrow.

Clear Image Tri-Ys & Hi-Flow cats >> 2.5" X-Pipe & Magnaflow Tri-Chambers, Mike Harris 4L60E, Circle-D 2,400 RPM TC, All MOOG FT End & Del-A-Lum bushed MOOG CTRL Arms, Eibach FT & New Stock HT rear springs. Hotchkis Sway Bars & End Links, RAISS, 3.73 Gears in Eaton carrier, Dynoshaft & CIA Loop, BMR Trailing Arms, Braided Brake Hoses, Taylor Spiro-Pro Wires, AutoMeter Water Temp & Oil PSI Gauges, Impala Console. ATE Blue Brake Fluid. Skip White distributor. 20's, Z28 Cluster, Corbeau GTS Seat
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