Heater/AC Diverter Box and Flap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**landy** · 12-03-2013, 11:06 PM

The flap inside the diverter box no longer moves with the cable. I can push the flap open and closed so I'm assuming the flap is done for after 40 plus years of service ('72 Blazer).

Brothers has replacement boxes listed for around $110 and LMC for around $120. I've been dissatisfied with some of the parts I've purchased from LMC, so am intending to purchase the box from Brothers, especially since it's $10 cheaper. But are there actually multiple manufacturers making these kinds of replacement parts or are these made at the same Chinese factory, but Brothers is just cheaper?

zeldman · 12-04-2013, 12:37 AM

I would guess there is only one manufacturer remaking these. Are you sure the door is broken? I had one years ago and it was slipping on the steel rod the door is mounted on. A little super glue and aluminum strips re-enforcing the door so it wont break and it worked fine.

**landy** · 12-04-2013, 01:36 AM

I think the door is slipping on the steel rod. I haven't taken it out, but I'm assuming that part of the door is broken or cracked. Perhaps it's repairable per your suggestion. Looks like removing the box is a bit of a PITA. Can the door or flap be removed w/o removing the box?

Andy4639 · 12-04-2013, 07:42 AM

I tried fixing mine several years ago with no success. I bought mine from a vendor locally U have to pull it out to try and fix it.

cdowns · 12-04-2013, 12:07 PM

i never had any luck tryin to rebuild or save the things// and found the easy warmest way to fix was replace with a new one from lmc at the time

BigRed76 · 12-05-2013, 03:58 PM

Maybe check Classic Heartbeat or GMC Pauls? They both have really good parts for our trucks...

12-03-2013, 11:06 PM	#1
landy Senior Member Join Date: Jun 2000 Location: alb, nm Posts: 413	Heater/AC Diverter Box and Flap The flap inside the diverter box no longer moves with the cable. I can push the flap open and closed so I'm assuming the flap is done for after 40 plus years of service ('72 Blazer). Brothers has replacement boxes listed for around $110 and LMC for around $120. I've been dissatisfied with some of the parts I've purchased from LMC, so am intending to purchase the box from Brothers, especially since it's $10 cheaper. But are there actually multiple manufacturers making these kinds of replacement parts or are these made at the same Chinese factory, but Brothers is just cheaper?

12-04-2013, 12:37 AM	#2
zeldman Registered User Join Date: Oct 2013 Location: Rt 66 Gallup, NM Posts: 527	Re: Heater/AC Diverter Box and Flap I would guess there is only one manufacturer remaking these. Are you sure the door is broken? I had one years ago and it was slipping on the steel rod the door is mounted on. A little super glue and aluminum strips re-enforcing the door so it wont break and it worked fine. __________________ 2005 GMC K2500HD D/A 1993 GMC K1500 2011 Subaru Legacy. 2013 Subaru Outback 1970 C-10 2WD, SWB stepside, 292, TH350, PS, more rust than anything. God is my pilot.

12-04-2013, 01:36 AM	#3
landy Senior Member Join Date: Jun 2000 Location: alb, nm Posts: 413	Re: Heater/AC Diverter Box and Flap I think the door is slipping on the steel rod. I haven't taken it out, but I'm assuming that part of the door is broken or cracked. Perhaps it's repairable per your suggestion. Looks like removing the box is a bit of a PITA. Can the door or flap be removed w/o removing the box?

12-04-2013, 07:42 AM	#4
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Heater/AC Diverter Box and Flap I tried fixing mine several years ago with no success. I bought mine from a vendor locally U have to pull it out to try and fix it. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

12-04-2013, 12:07 PM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Heater/AC Diverter Box and Flap i never had any luck tryin to rebuild or save the things// and found the easy warmest way to fix was replace with a new one from lmc at the time __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

12-05-2013, 03:58 PM	#6
BigRed76 Registered User Join Date: Jan 2010 Location: Loveland, CO Posts: 1,921	Re: Heater/AC Diverter Box and Flap Maybe check Classic Heartbeat or GMC Pauls? They both have really good parts for our trucks... __________________ Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB



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