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06-21-2015, 08:40 AM
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#1 |
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Senior Member
 
Join Date: May 2001
Location: Independence MO.
Posts: 7,705
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Question about blower motor going to high only when AC is on?
I have a '75 Silverado and when you turn the AC on the blower motor automatically goes to high speed and you can't switch it to any other speed. But the fan speed adjusts normal on all other setting, like vent, heat, and defrost. No matter where the fan switch is when you move the lever to AC, the fan goes to high speed. Any ideas on what's wrong? Thanks
__________________
72 3/4t Custom Deluxe 402/auto 66k Original paint 71 3/4t 4x4 Custom Deluxe 10k original miles Original paint 71 3/4t Cheyenne 402 70k original paint 72 3/4t 4x4 Custom deluxe 72 3/4t 4x4 Custom deluxe 91k original paint 72 Cheyenne/30 Dually 69 Camaro SS396 4-speed 13 GMC 2500HD Duramax I bought new 05 Jeep Wrangler "Willys Edition" 12k miles (I bought new) 85 3/4 ton 4x4 Scottsdale 33k miles original paint 86 1 ton 4x4 SRW Silverado 454 restored 80 1 ton 4x4 SRW Silverado 9,434 original miles!! original paint 95 GMC 1 ton dually 4x4 my dad bought new 95 GMC 3/4 ton 4x4, regular cab 454, 31k original miles 2002 2500HD 4x4 regular cab 6.0L 67k miles 2002 2500HD 4x4 regular cab 8.1L 28k miles 2003 GMC 2500HD 4x4 regular cab Diesel 93k miles 67-72 Parts for sale |
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06-21-2015, 09:50 AM
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#2 |
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Registered User
Join Date: Oct 2006
Location: MS
Posts: 479
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Re: Question about blower motor going to high only when AC is on?
I know on both of my 76's they do it on the MAX setting. I guess they figured if you wanted maximum cooling, the fan should be on hi also. On the NORM or non recirc setting the fan works on all speeds. I think in 77 they changed the control unit to allow the fan to work in all speeds on the MAX setting also. I know my 78 does.
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06-21-2015, 01:58 PM
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#3 |
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Senior Member
Join Date: May 2001
Location: Independence MO.
Posts: 7,705
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Re: Question about blower motor going to high only when AC is on?
My 75 doesn't have a max AC, just AC. They must have started that in '76?
__________________
72 3/4t Custom Deluxe 402/auto 66k Original paint 71 3/4t 4x4 Custom Deluxe 10k original miles Original paint 71 3/4t Cheyenne 402 70k original paint 72 3/4t 4x4 Custom deluxe 72 3/4t 4x4 Custom deluxe 91k original paint 72 Cheyenne/30 Dually 69 Camaro SS396 4-speed 13 GMC 2500HD Duramax I bought new 05 Jeep Wrangler "Willys Edition" 12k miles (I bought new) 85 3/4 ton 4x4 Scottsdale 33k miles original paint 86 1 ton 4x4 SRW Silverado 454 restored 80 1 ton 4x4 SRW Silverado 9,434 original miles!! original paint 95 GMC 1 ton dually 4x4 my dad bought new 95 GMC 3/4 ton 4x4, regular cab 454, 31k original miles 2002 2500HD 4x4 regular cab 6.0L 67k miles 2002 2500HD 4x4 regular cab 8.1L 28k miles 2003 GMC 2500HD 4x4 regular cab Diesel 93k miles 67-72 Parts for sale |
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06-21-2015, 04:22 PM
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#4 |
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Registered User
Join Date: Oct 2006
Location: MS
Posts: 479
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Re: Question about blower motor going to high only when AC is on?
Oh yes, sorry I forgot about that. Hmm I know my 73's don't do that??
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06-22-2015, 07:56 AM
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#5 |
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Registered User
Join Date: May 2004
Location: warner robins ga
Posts: 158
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Re: Question about blower motor going to high only when AC is on?
I had the same problem in one of my older Chevrolets. Take the level that goes from hot to cold and just move it just a little off of cold. Just a tad bit.
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06-22-2015, 09:09 AM
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#6 |
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Senior Member
Join Date: May 2001
Location: Independence MO.
Posts: 7,705
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Re: Question about blower motor going to high only when AC is on?
That's interesting, I'll give it a try.
__________________
72 3/4t Custom Deluxe 402/auto 66k Original paint 71 3/4t 4x4 Custom Deluxe 10k original miles Original paint 71 3/4t Cheyenne 402 70k original paint 72 3/4t 4x4 Custom deluxe 72 3/4t 4x4 Custom deluxe 91k original paint 72 Cheyenne/30 Dually 69 Camaro SS396 4-speed 13 GMC 2500HD Duramax I bought new 05 Jeep Wrangler "Willys Edition" 12k miles (I bought new) 85 3/4 ton 4x4 Scottsdale 33k miles original paint 86 1 ton 4x4 SRW Silverado 454 restored 80 1 ton 4x4 SRW Silverado 9,434 original miles!! original paint 95 GMC 1 ton dually 4x4 my dad bought new 95 GMC 3/4 ton 4x4, regular cab 454, 31k original miles 2002 2500HD 4x4 regular cab 6.0L 67k miles 2002 2500HD 4x4 regular cab 8.1L 28k miles 2003 GMC 2500HD 4x4 regular cab Diesel 93k miles 67-72 Parts for sale |
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06-22-2015, 06:47 PM
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#7 |
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Senior Member
Join Date: May 2001
Location: Independence MO.
Posts: 7,705
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Re: Question about blower motor going to high only when AC is on?
That worked, thanks for the info. I wonder why they were like that?
__________________
72 3/4t Custom Deluxe 402/auto 66k Original paint 71 3/4t 4x4 Custom Deluxe 10k original miles Original paint 71 3/4t Cheyenne 402 70k original paint 72 3/4t 4x4 Custom deluxe 72 3/4t 4x4 Custom deluxe 91k original paint 72 Cheyenne/30 Dually 69 Camaro SS396 4-speed 13 GMC 2500HD Duramax I bought new 05 Jeep Wrangler "Willys Edition" 12k miles (I bought new) 85 3/4 ton 4x4 Scottsdale 33k miles original paint 86 1 ton 4x4 SRW Silverado 454 restored 80 1 ton 4x4 SRW Silverado 9,434 original miles!! original paint 95 GMC 1 ton dually 4x4 my dad bought new 95 GMC 3/4 ton 4x4, regular cab 454, 31k original miles 2002 2500HD 4x4 regular cab 6.0L 67k miles 2002 2500HD 4x4 regular cab 8.1L 28k miles 2003 GMC 2500HD 4x4 regular cab Diesel 93k miles 67-72 Parts for sale |
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