Heater-Vent-Defroster control problem-any guesses - The 1947 - Present Chevrolet & GMC Truck Message Board Network

PA-IndianRider · 08-01-2008, 06:12 PM

Just picked up a '81 el Camino yesterday.

Driving it everywhere right now which means I'm starting to notice ALL the little things that need attention/fixed. The heater/vent/defroster control moves just fine but not much air is comming thru.... sounds like the duct work is closed with the fan running.

As i recall the "slide" control when moved to whatever "chosen position" opens the duct work to the desired function ... which I believe is activated by a vacuum switch..... OR????

Any Guesses????? Thanks....

PanelDeland · 08-01-2008, 09:19 PM

My best advise is to go to www.motorbooks.com and see if they have a manual for it.I would imagine they will have a "Haynes" but I don't know about others.IIRC and there is no guaratee of that,that era would be vacuum activated.

PA-IndianRider · 08-01-2008, 10:54 PM

Quote:

Originally Posted by PanelDeland

and there is no guaratee of that,that era would be vacuum activated.

Reason I mentioned I thought it could be a "vacuum activated" system is I had a '84 Poncho STE NEW back then and had the same symptoms... I took it to the dealer.... Mr "NOT-Goodwrench" tore the whole dash apart trying to figure out the problem ..... THEN MR GOODWRENCH came back from being on vacation for a week.... replaced a simple part & all was well.... I recall it was something related to the system being vacuum operated.... in other words the control was NOT operated by "cables and levels".... afterall that would be so simpleand also "easy" to fix..... Thanks for the tip about finding a "Haynes" or.... a "surfing here I go"

airdale94 · 08-02-2008, 10:17 PM

Check under the hood for a vaccum pod, black plastic about the size of a baseball. Check the line going to it and going through the firewall.

Longhorn Man · 08-03-2008, 12:25 AM

movin to general discussion

08-01-2008, 06:12 PM	#1
PA-IndianRider Registered User Join Date: Jul 2007 Location: Pittsburgh, PA Posts: 294	Heater-Vent-Defroster control problem-any guesses Just picked up a '81 el Camino yesterday. Driving it everywhere right now which means I'm starting to notice ALL the little things that need attention/fixed. The heater/vent/defroster control moves just fine but not much air is comming thru.... sounds like the duct work is closed with the fan running. As i recall the "slide" control when moved to whatever "chosen position" opens the duct work to the desired function ... which I believe is activated by a vacuum switch..... OR???? Any Guesses????? Thanks.... Attached Images __________________ John aka "Milner" PA-IndianRider - Pittsburgh, PA 70 Chevy C10 Stepside "Gasser/Altered Drag Race Hot Rod" *Where were You in '62 ?* Last edited by PA-IndianRider; 08-01-2008 at 06:18 PM.

08-01-2008, 09:19 PM	#2
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: Heater-Vent-Defroster control problem-any guesses My best advise is to go to www.motorbooks.com and see if they have a manual for it.I would imagine they will have a "Haynes" but I don't know about others.IIRC and there is no guaratee of that,that era would be vacuum activated. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

08-02-2008, 10:17 PM	#4
airdale94 Registered User Join Date: Jan 2007 Location: Topeka,KS Posts: 778	Re: Heater-Vent-Defroster control problem-any guesses Check under the hood for a vaccum pod, black plastic about the size of a baseball. Check the line going to it and going through the firewall.

08-03-2008, 12:25 AM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Heater-Vent-Defroster control problem-any guesses movin to general discussion



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