AC Blend door "clip"? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**kwmech** · 09-06-2021, 03:04 PM

Taking the heater core out of my dads 83 Truck and found a broken plastic connector that moves the blend door via the vac pod from the opposite side. I know GM has them for about 3-4 dollars, but I've found one out of either aluminum or steel--but really 30 plus dollars each? yikes!! Any vendor on the board here have it?? Looking to get a couple of them for future endeavors and one for my suburban if there is ever an issue with it.

**kwmech** · 09-06-2021, 03:07 PM

This little jewel

Dead Parrot · 09-07-2021, 06:13 AM

Post #35 in this thread: http://67-72chevytrucks.com/vboard/s...d.php?t=460942 shows my homemade metal solution. It is still working today.

Jeepwm69 · 09-15-2021, 04:46 PM

I just ordered one of the aluminum ones off of ebay. Buy once, cry once.

But can someone tell me how the blend door works? Is there a way to test function?

I have my dash all pulled apart at the moment and want to make sure everything is working properly when it goes back together.

**hatzie** · 09-15-2021, 08:21 PM

Quote:

Originally Posted by Jeepwm69

I just ordered one of the aluminum ones off of ebay. Buy once, cry once.

But can someone tell me how the blend door works? Is there a way to test function?

I have my dash all pulled apart at the moment and want to make sure everything is working properly when it goes back together.

It's controlled by the COLD <----> HOT lever.
Vacuum on newer machines and cable on the older machines.

**kwmech** · 09-15-2021, 09:54 PM

I sucked it up and got 2 aluminum ones. One for my suburban and one for the dads truck. They arrived today as a matter of fact

Jeepwm69 · 09-16-2021, 05:10 PM

Quote:

Originally Posted by hatzie

It's controlled by the COLD <----> HOT lever.
Vacuum on newer machines and cable on the older machines.

This is an 83. I have the cable for hot/cold working well, but the blend door (assuming I'm using the proper term for the door that the clip attaches to) just seems to flap back and forth.

Guessing the engine has to be running (to produce vacuum) but what else makes it move back and forth? I want to make sure everything is working as it should before I put all the ductwork etc back in place.

**hatzie** · 09-16-2021, 05:51 PM

Quote:

Originally Posted by Jeepwm69

This is an 83. I have the cable for hot/cold working well, but the blend door (assuming I'm using the proper term for the door that the clip attaches to) just seems to flap back and forth.

Guessing the engine has to be running (to produce vacuum) but what else makes it move back and forth? I want to make sure everything is working as it should before I put all the ductwork etc back in place.

You can apply vacuum to the HVAC vacuum accumulator tank and test the operation of the control valves and motors.
This is supposed to be the HVAC Vacuum diagram for a K5.
Name: HVAC K5 Vacuum.jpg
Views: 1613
Size: 28.9 KB

Name: HVAC K5 Vacuum.jpg
Views: 1613
Size: 28.9 KB

Jeepwm69 · 09-20-2021, 01:10 PM

Quote:

Originally Posted by hatzie

You can apply vacuum to the HVAC vacuum accumulator tank and test the operation of the control valves and motors.
This is supposed to be the HVAC Vacuum diagram for a K5.
Attachment 2131574

Thank you! That's great info!

Pontiac1976 · 09-26-2021, 03:39 PM

Quote:

Taking the heater core out of my dads 83 Truck and found a broken plastic connector that moves the blend door via the Vac. pod from the opposite side. I know GM has them for about 3-4 dollars, but I've found one out of either aluminum or steel--but really 30 plus dollars each? yikes!! Any vendor on the board here have it?? Looking to get a couple of them for future endeavors and one for my suburban if there is ever an issue with it.

Try LMC Pg.180 #7 $5.95 If that that the part "Connecter-Diverter link for A/c

**kwmech** · 09-26-2021, 04:06 PM

Quote:

Originally Posted by Pontiac1976

Try LMC Pg.180 #7 $5.95 If that that the part "Connecter-Diverter link for A/c

Yup, but it is still plastic and now chinese plastic.

Pontiac1976 · 09-27-2021, 08:36 PM

Well then just get a solid round alum rod big enough from home depot. Cut off a section use hack it with Dremel Tool and Accessories. Cut and grind in to shape in 2 hour you should be able get it rough out the Chinese alum test fit fine tuning it for fitment. You can spend as much to finish it to your liking. I did not know you did not want Chinese plastic. The shape is not hard to make. The other option is pc 3D printer buy one or try calling 3D printer shop to do some up for you.( but Plastic again)

**kwmech** · 09-27-2021, 11:42 PM

Quote:

Originally Posted by Pontiac1976

Well then just get a solid round alum rod big enough from home depot. Cut off a section use hack it with Dremel Tool and Accessories. Cut and grind in to shape in 2 hour you should be able get it rough out the Chinese alum test fit fine tuning it for fitment. You can spend as much to finish it to your liking. I did not know you did not want Chinese plastic. The shape is not hard to make. The other option is pc 3D printer buy one or try calling 3D printer shop to do some up for you.( but Plastic again)

Good grief see post number 6

**Hart_Rod** · 01-01-2022, 06:18 PM

Quote:

Originally Posted by Jeepwm69

I just ordered one of the aluminum ones off of ebay. Buy once, cry once.

But can someone tell me how the blend door works? Is there a way to test function?

I have my dash all pulled apart at the moment and want to make sure everything is working properly when it goes back together.

link?

**TKCR** · 01-02-2022, 09:34 AM

Quote:

Originally Posted by Hart_Rod

link?

Go to Ebay, type in a/c heater blend door clip. Several pop up.

**hatzie** · 01-03-2022, 01:28 PM

If you can run a grinder and MIG you can DIY one out of steel.

**Hart_Rod** · 01-05-2022, 01:17 PM

Quote:

Originally Posted by TKCR

Go to Ebay, type in a/c heater blend door clip. Several pop up.

Quote:

Originally Posted by hatzie

If you can run a grinder and MIG you can DIY one out of steel.

Thanks! I ordered one of the aluminum pieces. Hopefully I will never have to replace it again. On another note, where are you guys sourcing quality heater cores? TIA!

09-06-2021, 03:04 PM	#1
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,628	AC Blend door "clip"? Taking the heater core out of my dads 83 Truck and found a broken plastic connector that moves the blend door via the vac pod from the opposite side. I know GM has them for about 3-4 dollars, but I've found one out of either aluminum or steel--but really 30 plus dollars each? yikes!! Any vendor on the board here have it?? Looking to get a couple of them for future endeavors and one for my suburban if there is ever an issue with it.

09-06-2021, 03:07 PM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,628	Re: AC Blend door "clip"? This little jewel Attached Images

09-15-2021, 04:46 PM	#4
Jeepwm69 Registered User Join Date: Jan 2009 Location: Arkansas Posts: 687	Re: AC Blend door "clip"? I just ordered one of the aluminum ones off of ebay. Buy once, cry once. But can someone tell me how the blend door works? Is there a way to test function? I have my dash all pulled apart at the moment and want to make sure everything is working properly when it goes back together.

09-15-2021, 09:54 PM	#6
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,628	Re: AC Blend door "clip"? I sucked it up and got 2 aluminum ones. One for my suburban and one for the dads truck. They arrived today as a matter of fact

09-27-2021, 08:36 PM	#12
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 766	Re: AC Blend door "clip"? Well then just get a solid round alum rod big enough from home depot. Cut off a section use hack it with Dremel Tool and Accessories. Cut and grind in to shape in 2 hour you should be able get it rough out the Chinese alum test fit fine tuning it for fitment. You can spend as much to finish it to your liking. I did not know you did not want Chinese plastic. The shape is not hard to make. The other option is pc 3D printer buy one or try calling 3D printer shop to do some up for you.( but Plastic again) __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.

09-07-2021, 06:13 AM	#3
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,611	Re: AC Blend door "clip"? Post #35 in this thread: http://67-72chevytrucks.com/vboard/s...d.php?t=460942 shows my homemade metal solution. It is still working today.

01-03-2022, 01:28 PM	#16
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: AC Blend door "clip"? If you can run a grinder and MIG you can DIY one out of steel. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.



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