defrosters not working on 85 burb - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lazerus · 04-05-2005, 03:55 PM

defrosters not working just blowing out the vents and the floor area can anyone help

89blacksub · 04-05-2005, 06:38 PM

about the only thing i would think to do is check for disconnected hoses or blockage

lazerus · 04-07-2005, 02:22 PM

thanks for the reply

edman87 · 04-07-2005, 10:24 PM

You have a vacuum problem- somewhere. It sounds like you have a total loss of vacuum to your ac fromunder the hood. There is 1 small hose through the firewall to the pass side of center that goes to a vacuum source,check it first and then trace to under dash if the problem is still there. This is not guarnteed, but is 95% of vent switching problems.

lazerus · 04-08-2005, 11:48 AM

thanks for the reply i'll check that alot of the vacuum lines were disconnected i bought the truck from ebay for 200.00

04-05-2005, 03:55 PM	#1
lazerus Registered User Join Date: Nov 2004 Location: exeter pa Posts: 37	defrosters not working on 85 burb defrosters not working just blowing out the vents and the floor area can anyone help

04-05-2005, 06:38 PM	#2
89blacksub army slave Join Date: Feb 2005 Location: FT Hood, Texas Posts: 89	about the only thing i would think to do is check for disconnected hoses or blockage __________________ 1989 suburban 1500 4X4 silverado all stock...for now. plans; 6 inch susp lift 36" tires on 15" rims new all black paint custom bumbers misc engine mods until it goes, then drop in 454 nerf step bars billet grill ...

04-07-2005, 02:22 PM	#3
lazerus Registered User Join Date: Nov 2004 Location: exeter pa Posts: 37	going to pull the dash apart and check thanks for the reply

04-07-2005, 10:24 PM	#4
edman87 junk collector Join Date: Dec 2004 Location: above Baton Rouge, LA Posts: 693	You have a vacuum problem- somewhere. It sounds like you have a total loss of vacuum to your ac fromunder the hood. There is 1 small hose through the firewall to the pass side of center that goes to a vacuum source,check it first and then trace to under dash if the problem is still there. This is not guarnteed, but is 95% of vent switching problems. __________________ '87/89/76 K5 in progress '99 K2500 short crew '91 camaro rs '98 jeep tj '52 willys cj3a

04-08-2005, 11:48 AM	#5
lazerus Registered User Join Date: Nov 2004 Location: exeter pa Posts: 37	thanks for the reply i'll check that alot of the vacuum lines were disconnected i bought the truck from ebay for 200.00



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