vacuum selector switch - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Old Dave · 08-20-2001, 08:03 AM

Anyone ever had to replace the vacuum selecotr swtich in the heater/ac panel. My 86 C10 doesn't work correctly anymore. When you put it on defrost the air comes out of the dash vents. Now when you put it on vent the AC compressor is still running and it blows cold air out of the dash vents. The compressor does not run when you are in the heater position. Just wondering how big a job it was to replace.

gchemist · 08-20-2001, 06:28 PM

Old Dave,

I have never replaced one of the vacuum switches. I have replaced the fan speed selector switch. Check all your vacuum connections under the dash before you start replacing parts. The easiest way I can see to replace the setup is to remove the dash bezel and the dash. Removing these two items will give you plenty of access to all the cable connections. I would say it will take a few hours to get it done.

------------------
Gerardo
1983 Custom Truck
TX Plates: "BAD BOW"
http://www.geocities.com/abetterchemist/

bigd65 · 08-22-2001, 12:37 PM

if you are refering to the one that turns off the ac and alkl that i have replaced it. it is easy and is no problem to do. they are not even expensive,15.00 bucks at the dealer i believe. the contacts burn through the plastic therefore not making connections on the proper location for you want blowing. just take it apart and look at it it is really kinda simple

------------------
85 C10 350/700r4
91'BURB GRILL CONVERTION
HOLLEY STREET DOMINATOR INTAKE
EDELBROCK 1406 COMP. SERIES CARB.
HYPERTECH POWER COIL
FACTORY HEADERS
MAGNAFLOW CAT/MUFFLER/3in. EXHAUST
3.42 REAR GEARS
PROTHANE SUSPENSION-TOTAL KIT
DUAL 13" ELECTRIC FANS
and still going
"thats my toy"
Jeff Dodson
Angleton,Tx.

08-20-2001, 08:03 AM	#1
Old Dave Is a bullfrog waterproof? Join Date: Nov 2000 Location: OLATHE, KANSAS Posts: 1,130	vacuum selector switch Anyone ever had to replace the vacuum selecotr swtich in the heater/ac panel. My 86 C10 doesn't work correctly anymore. When you put it on defrost the air comes out of the dash vents. Now when you put it on vent the AC compressor is still running and it blows cold air out of the dash vents. The compressor does not run when you are in the heater position. Just wondering how big a job it was to replace. __________________ "It is better to remain silent and be thought a fool, than to open one's mouth and remove all doubt." Ben Franklin __________________ 1970 Chevy shortbed 2002 Harley Custom Chopper (Long sucker) 1998 K2500 5.7L 5-speed Longbed 1st two are My son's toys...they just live in my garage! 1997 GMC K1500 Suburban 1993 S-10 Blazer 4D (youngest son's daily driver) 2000 Dodge Ram 4WD Ext. Cab (5.9L) Wife is a late year 1951

08-20-2001, 06:28 PM	#2
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Old Dave, I have never replaced one of the vacuum switches. I have replaced the fan speed selector switch. Check all your vacuum connections under the dash before you start replacing parts. The easiest way I can see to replace the setup is to remove the dash bezel and the dash. Removing these two items will give you plenty of access to all the cable connections. I would say it will take a few hours to get it done. ------------------ Gerardo 1983 Custom Truck TX Plates: "BAD BOW" http://www.geocities.com/abetterchemist/ __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

08-22-2001, 12:37 PM	#3
bigd65 Registered User Join Date: Mar 2000 Location: Clute, TX. Posts: 1,935	if you are refering to the one that turns off the ac and alkl that i have replaced it. it is easy and is no problem to do. they are not even expensive,15.00 bucks at the dealer i believe. the contacts burn through the plastic therefore not making connections on the proper location for you want blowing. just take it apart and look at it it is really kinda simple ------------------ 85 C10 350/700r4 91'BURB GRILL CONVERTION HOLLEY STREET DOMINATOR INTAKE EDELBROCK 1406 COMP. SERIES CARB. HYPERTECH POWER COIL FACTORY HEADERS MAGNAFLOW CAT/MUFFLER/3in. EXHAUST 3.42 REAR GEARS PROTHANE SUSPENSION-TOTAL KIT DUAL 13" ELECTRIC FANS and still going "thats my toy" Jeff Dodson Angleton,Tx. __________________ 2004 Silverado Crewcab 1972 Chevy Monte Carlo 2017 Chevy Tahoe

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