The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 09-06-2021, 03:04 PM   #1
kwmech
Senior Member
 
Join Date: Mar 2003
Location: Colfax-California
Posts: 6,812
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.
kwmech is online now   Reply With Quote
Old 09-06-2021, 03:07 PM   #2
kwmech
Senior Member
 
Join Date: Mar 2003
Location: Colfax-California
Posts: 6,812
Re: AC Blend door "clip"?

This little jewel
Attached Images
 
kwmech is online now   Reply With Quote
Old 09-07-2021, 06:13 AM   #3
Dead Parrot
Registered User
 
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 1,863
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.
Dead Parrot is offline   Reply With Quote
Old 09-15-2021, 04:46 PM   #4
Jeepwm69
Registered User
 
Join Date: Jan 2009
Location: Arkansas
Posts: 614
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.
Jeepwm69 is offline   Reply With Quote
Old 09-15-2021, 08:21 PM   #5
hatzie
Moderator
 
hatzie's Avatar
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,389
Re: AC Blend door "clip"?

Quote:
Originally Posted by Jeepwm69 View Post
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.
__________________
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...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.
hatzie is offline   Reply With Quote
Old 09-15-2021, 09:54 PM   #6
kwmech
Senior Member
 
Join Date: Mar 2003
Location: Colfax-California
Posts: 6,812
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
kwmech is online now   Reply With Quote
Old 09-16-2021, 05:10 PM   #7
Jeepwm69
Registered User
 
Join Date: Jan 2009
Location: Arkansas
Posts: 614
Re: AC Blend door "clip"?

Quote:
Originally Posted by hatzie View Post
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.
Jeepwm69 is offline   Reply With Quote
Old 09-16-2021, 05:51 PM   #8
hatzie
Moderator
 
hatzie's Avatar
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,389
Re: AC Blend door "clip"?

Quote:
Originally Posted by Jeepwm69 View Post
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: 34
Size:  28.9 KB
__________________
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...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.
hatzie is offline   Reply With Quote
Old 09-20-2021, 01:10 PM   #9
Jeepwm69
Registered User
 
Join Date: Jan 2009
Location: Arkansas
Posts: 614
Re: AC Blend door "clip"?

Quote:
Originally Posted by hatzie View Post
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!
Jeepwm69 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 01:23 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Copyright 1997-2020 67-72chevytrucks.com