Heater/Defrost Help Needed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**JJanzen** · 10-03-2009, 03:55 PM

Last year I took all of my interior heater/ac component (on the inside) apart, cleaned and fixed all my hoses with some replacements. Everything worked great. This year, when firing up the system last week, I got very little air out of either the defrost or heater duct (on the hump) but am gettting hot air out of the center, passenger and driver's side AC vents. Is this an issue with vacumn or ??? Any help would be appreciated! Thanks.

Joel

**Thealien** · 10-03-2009, 04:46 PM

Either the cable is not on correctly on your diverter box or most likely the flapper door has broken off the diverter box. You can get new aftermarket ones. I fixed mine with epoxy a month ago and it is still working but for how long?

woodwright · 10-03-2009, 04:50 PM

maybe its a mouse

**JJanzen** · 10-03-2009, 06:04 PM

Are you thinking the top cable?

**JJanzen** · 10-03-2009, 07:27 PM

I checked the flapper and when I manually push it up and push on the lever it stays closed allowing air to the heater and defrost ducts. Seems like that is the problem. Thanks for the help.

Joel

10-03-2009, 03:55 PM	#1
JJanzen Senior Member Join Date: Feb 2008 Location: Denver, CO Posts: 252	Heater/Defrost Help Needed Last year I took all of my interior heater/ac component (on the inside) apart, cleaned and fixed all my hoses with some replacements. Everything worked great. This year, when firing up the system last week, I got very little air out of either the defrost or heater duct (on the hump) but am gettting hot air out of the center, passenger and driver's side AC vents. Is this an issue with vacumn or ??? Any help would be appreciated! Thanks. Joel __________________ Blue72 Red72

10-03-2009, 04:46 PM	#2
Thealien Senior Member Join Date: Jun 2007 Location: Pine Ridge Florida Posts: 4,138	Re: Heater/Defrost Help Needed Either the cable is not on correctly on your diverter box or most likely the flapper door has broken off the diverter box. You can get new aftermarket ones. I fixed mine with epoxy a month ago and it is still working but for how long?

10-03-2009, 04:50 PM	#3
woodwright Enjoying left field Join Date: Jun 2008 Location: Dillon Montana Posts: 900	Re: Heater/Defrost Help Needed maybe its a mouse __________________ Clint 70 Chevy 4WD "Ultimate Work Truck" SOLD

10-03-2009, 06:04 PM	#4
JJanzen Senior Member Join Date: Feb 2008 Location: Denver, CO Posts: 252	Re: Heater/Defrost Help Needed Are you thinking the top cable? __________________ Blue72 Red72

10-03-2009, 07:27 PM	#5
JJanzen Senior Member Join Date: Feb 2008 Location: Denver, CO Posts: 252	Re: Heater/Defrost Help Needed I checked the flapper and when I manually push it up and push on the lever it stays closed allowing air to the heater and defrost ducts. Seems like that is the problem. Thanks for the help. Joel __________________ Blue72 Red72



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