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

jthornton · 05-04-2009, 09:51 AM

i have a 72 c10 and i need help with my defrost and heater controls.. can anyone show me a picture of what i need to do and what it looks like under the dash? I think im going to order the heater control box w/o ac out of lmc along with the cable set but does anyone know if thats all i need? i have the heater box so i wont need that and i saw but other than that i dont have anything else. can someone help me out.. this is one of the last things i need to do to finish my truck!!

hounddogs! · 05-04-2009, 10:16 AM

I just replaced the control on my '68, it's stupid simple. All that's involved is the control panel itself, the snap-in light and the cables. Does the LMC kit included the electrical components for the fan control?

jthornton · 05-04-2009, 10:22 AM

yes i believe so i think in the catalog its #22-heater switch

Mark B · 05-04-2009, 01:25 PM

I just finished refubing my interior heater components - just take it one step at a time...

1st remove and check control unit operation and fix or replace as necessary. I repaired mine to as good as new.

Remove and check the cables. Mine were very hard to move. Working fine now after lots of lubing.

Then I took out the main heater plenum. I painted it and lubed the pivot points so all is working smooth now.

Then I took out the plenum against the firewall. It's getting cleaned.

Then I lubed the flap pivot points on the engine side of the firewall and that fixed a nasty squeek and makes it move real nice.

I'll be putting it all back together soon and expect it should all work fine.

Mark B

Andy4639 · 05-05-2009, 02:00 AM

Make sure you don't kink the cables are put them in to much of a bind. Also when assembling make sure you don't get them upside down when you twist the controller up in the dash. beleive me it can happen!

05-04-2009, 09:51 AM	#1
jthornton Registered User Join Date: Sep 2008 Location: Presto Pa, Posts: 53	Heater/Defrost Please Help! i have a 72 c10 and i need help with my defrost and heater controls.. can anyone show me a picture of what i need to do and what it looks like under the dash? I think im going to order the heater control box w/o ac out of lmc along with the cable set but does anyone know if thats all i need? i have the heater box so i wont need that and i saw but other than that i dont have anything else. can someone help me out.. this is one of the last things i need to do to finish my truck!!

05-04-2009, 10:22 AM	#3
jthornton Registered User Join Date: Sep 2008 Location: Presto Pa, Posts: 53	Re: Heater/Defrost Please Help! yes i believe so i think in the catalog its #22-heater switch

05-04-2009, 01:25 PM	#4
Mark B Registered User Join Date: Oct 2005 Location: Ontario, Canada Posts: 145	Re: Heater/Defrost Please Help! I just finished refubing my interior heater components - just take it one step at a time... 1st remove and check control unit operation and fix or replace as necessary. I repaired mine to as good as new. Remove and check the cables. Mine were very hard to move. Working fine now after lots of lubing. Then I took out the main heater plenum. I painted it and lubed the pivot points so all is working smooth now. Then I took out the plenum against the firewall. It's getting cleaned. Then I lubed the flap pivot points on the engine side of the firewall and that fixed a nasty squeek and makes it move real nice. I'll be putting it all back together soon and expect it should all work fine. Mark B

05-05-2009, 02:00 AM	#5
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Heater/Defrost Please Help! Make sure you don't kink the cables are put them in to much of a bind. Also when assembling make sure you don't get them upside down when you twist the controller up in the dash. beleive me it can happen! __________________ 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.

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05-04-2009, 10:16 AM	#2
hounddogs! Restoring it $200 at a time... Join Date: Aug 2008 Location: NE Kansas Posts: 886	Re: Heater/Defrost Please Help! I just replaced the control on my '68, it's stupid simple. All that's involved is the control panel itself, the snap-in light and the cables. Does the LMC kit included the electrical components for the fan control? __________________ Charter member of the 'Put the dimmer switch back on the damn floor where it belongs' Society '68 5.3L-4 speed LWB C20; grandpa bought it for the farm in '71. Now LS 5.3, rather than 327. DD '09 Pilot Weekender '65 Skylark 300-4V-4 speed Wife's '07 Lexus ES350; 117 actuator motors and I can't see the engine. Son's '04 F250 SuperCab 6.0



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