heater/ vacuum line problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

steves1967 · 02-02-2003, 02:26 AM

Okay, here goes- from as far back as i can remember the heater has always blown hot air out of the vents, it did have AC at one time but i pulled the compressor out- even when the heater is off. So i started messin' around and found that there is no vacuum signal to the heater hose valve on the fenderwell under the hood. The vacuum line is there but no vacuum- I do have vacuum from the carb- and that line goes in to the passenger compartment- but where does it go from there?? And secondly the center vent on the dash- the vent is metal but the housing is plastic- when the vent gets hot it melts the housing and now the vent won't stay open- do they make a metal housing?? THANKS

**GMCPaul** · 02-02-2003, 03:53 AM

GMCPaul

Blue Beard · 02-02-2003, 10:32 AM

I was having a problem and found a disconnected line.

Hidden behind the right bank of the engine. Was a T adapter in the line. The hose split and came off.

Good Luck

02-02-2003, 02:26 AM	#1
steves1967 Registered User Join Date: Dec 2001 Location: Manteca, Ca USA Posts: 305	heater/ vacuum line problems Okay, here goes- from as far back as i can remember the heater has always blown hot air out of the vents, it did have AC at one time but i pulled the compressor out- even when the heater is off. So i started messin' around and found that there is no vacuum signal to the heater hose valve on the fenderwell under the hood. The vacuum line is there but no vacuum- I do have vacuum from the carb- and that line goes in to the passenger compartment- but where does it go from there?? And secondly the center vent on the dash- the vent is metal but the housing is plastic- when the vent gets hot it melts the housing and now the vent won't stay open- do they make a metal housing?? THANKS

02-02-2003, 03:53 AM	#2
GMCPaul Senior Member Join Date: Mar 2000 Location: Rockville,In. USA Posts: 3,721	GMCPaul __________________ Secure Online Catalog for-GMCPauls Truck Parts Email- GMCPAULS@GMAIL.COM

02-02-2003, 10:32 AM	#3
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,834	Vacuum problem I was having a problem and found a disconnected line. Hidden behind the right bank of the engine. Was a T adapter in the line. The hose split and came off. Good Luck __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

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