Defrost control cable and arm - The 1947 - Present Chevrolet & GMC Truck Message Board Network

REDROCKER652002 · 02-27-2020, 07:02 PM

OK, So here is the next in the series of never ending questions for my son's 69. The defrost cable, arm and diverter flap. It seems the little arm that the cable runs along to open and shut the flap to divert the hot air is very close to the firewall insulation. I think that, and also a worn or stuck cable seems to be keeping the flap closed and no defrost on the truck. Is that little arm supposed to be on the firewall side of the truck? If so, should it be so close that it is rubbing the insulation? That is the only thing I can see that is keeping it from moving up and down. Anybody have any photos of what it should look like? I have a new controller and cables I will be installing soon, but just wondering as I sit here and have a beer what the deal is? Thanks to all who may have any input. RR

Andy4639 · 02-27-2020, 10:38 PM

The defrost is on the front side (feet side)of the cab duct work down by the center of the truck. This is for a stock heater system.

REDROCKER652002 · 02-28-2020, 11:36 AM

Hmmmm, mine is on the back. I will try and get some photos, but it is a straight arm that is in the back of the setup.

REDROCKER652002 · 02-28-2020, 11:38 AM

OK. I looked a little closer at your photos. That is right, but there is a part where the hoses hook in at the top to run to the vents on the dash. That part has the lever on the back and seems to be the problem with my son not getting any airflow to the dash vents. Does that make more sense? It is easy to take out, so I will take it out and post some photos but in the meantime, does anybody know what I might be looking at? LOL.

Thanks for the input.

**LockDoc** · 02-28-2020, 01:19 PM

Quote:

Originally Posted by REDROCKER652002

Hmmmm, mine is on the back. I will try and get some photos, but it is a straight arm that is in the back of the setup.

Is yours A/C or non-A/C?

LockDoc

Andy4639 · 02-28-2020, 03:02 PM

Quote:

Originally Posted by LockDoc

Is yours A/C or non-A/C?

LockDoc

Good question.

Quote:

OK. I looked a little closer at your photos. That is right, but there is a part where the hoses hook in at the top to run to the vents on the dash. That part has the lever on the back and seems to be the problem with my son not getting any airflow to the dash vents. Does that make more sense? It is easy to take out, so I will take it out and post some photos but in the meantime, does anybody know what I might be looking at? LOL.

Thanks for the input.

Not sure about what your asking about in you last post. There is no factory stuff inside the hoses going to the dash that would keep the defrost from working.
Doesn't matter if it's AC are not.
Can you post pictures of what you are talking about?

REDROCKER652002 · 02-28-2020, 05:32 PM

it is non ac. I will take the part out and get some photos so you guys can see it. It is the piece where the dash vent hoses hook up to at the box. It has two spots for the dash vents to hook up to and has a flap on the inside to redirect the air up to the dash. It is hard to explain, so I will try and get some photo's up

REDROCKER652002 · 02-28-2020, 06:09 PM

Here are some photo's (gonna try anyway, LOL)

REDROCKER652002 · 02-28-2020, 06:10 PM

The flap on the inside goes up and down to direct the heat up to the dash or down to the floor.. Is this the normal 1969 setup?

**LockDoc** · 02-28-2020, 06:13 PM

Quote:

Originally Posted by REDROCKER652002

The flap on the inside goes up and down to direct the heat up to the dash or down to the floor.. Is this the normal 1969 setup?

Nope, not '69 GM truck anyway. I don't know what that is out of.

LockDoc

Andy4639 · 02-28-2020, 08:45 PM

Quote:

Originally Posted by LockDoc

Nope, not '69 GM truck anyway. I don't know what that is out of.

LockDoc

Agree not a 67-72 truck heater part. Maybe a car from that same time frame but definitely not a truck part.
Pictures of my 68 I just finished doing. These are all the parts inside the cab for heat only.

REDROCKER652002 · 02-28-2020, 11:35 PM

Thanks guys, I have been lucky enough to have a board member offer to sell me the correct parts. So, my son is not happy, but at least we will have the right stuff in it going forward.

RR

02-27-2020, 07:02 PM	#1
REDROCKER652002 Registered User Join Date: Nov 2018 Location: South San Francisco CA, Posts: 434	Defrost control cable and arm OK, So here is the next in the series of never ending questions for my son's 69. The defrost cable, arm and diverter flap. It seems the little arm that the cable runs along to open and shut the flap to divert the hot air is very close to the firewall insulation. I think that, and also a worn or stuck cable seems to be keeping the flap closed and no defrost on the truck. Is that little arm supposed to be on the firewall side of the truck? If so, should it be so close that it is rubbing the insulation? That is the only thing I can see that is keeping it from moving up and down. Anybody have any photos of what it should look like? I have a new controller and cables I will be installing soon, but just wondering as I sit here and have a beer what the deal is? Thanks to all who may have any input. RR

02-27-2020, 10:38 PM	#2
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: Defrost control cable and arm The defrost is on the front side (feet side)of the cab duct work down by the center of the truck. This is for a stock heater system. Attached Images __________________ 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.

02-28-2020, 11:36 AM	#3
REDROCKER652002 Registered User Join Date: Nov 2018 Location: South San Francisco CA, Posts: 434	Re: Defrost control cable and arm Hmmmm, mine is on the back. I will try and get some photos, but it is a straight arm that is in the back of the setup.

02-28-2020, 11:38 AM	#4
REDROCKER652002 Registered User Join Date: Nov 2018 Location: South San Francisco CA, Posts: 434	Re: Defrost control cable and arm OK. I looked a little closer at your photos. That is right, but there is a part where the hoses hook in at the top to run to the vents on the dash. That part has the lever on the back and seems to be the problem with my son not getting any airflow to the dash vents. Does that make more sense? It is easy to take out, so I will take it out and post some photos but in the meantime, does anybody know what I might be looking at? LOL. Thanks for the input. Last edited by REDROCKER652002; 02-28-2020 at 11:44 AM.

02-28-2020, 05:32 PM	#7
REDROCKER652002 Registered User Join Date: Nov 2018 Location: South San Francisco CA, Posts: 434	Re: Defrost control cable and arm it is non ac. I will take the part out and get some photos so you guys can see it. It is the piece where the dash vent hoses hook up to at the box. It has two spots for the dash vents to hook up to and has a flap on the inside to redirect the air up to the dash. It is hard to explain, so I will try and get some photo's up

02-28-2020, 06:09 PM	#8
REDROCKER652002 Registered User Join Date: Nov 2018 Location: South San Francisco CA, Posts: 434	Re: Defrost control cable and arm Here are some photo's (gonna try anyway, LOL) Attached Images

02-28-2020, 06:10 PM	#9
REDROCKER652002 Registered User Join Date: Nov 2018 Location: South San Francisco CA, Posts: 434	Re: Defrost control cable and arm The flap on the inside goes up and down to direct the heat up to the dash or down to the floor.. Is this the normal 1969 setup?

02-28-2020, 11:35 PM	#12
REDROCKER652002 Registered User Join Date: Nov 2018 Location: South San Francisco CA, Posts: 434	Re: Defrost control cable and arm Thanks guys, I have been lucky enough to have a board member offer to sell me the correct parts. So, my son is not happy, but at least we will have the right stuff in it going forward. RR



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