Topic: Not much heat from heater
in Forum: C3 Cooling and Heating Systems
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Lifetime MemberSHELBYVILLE, TN - USA
Joined: 7/5/2002
Posts: 3942
Vette(s): 1976 L48 auto
1978 L82 4speed
1994 LT1 6speed
1978 L82 4speed
1994 LT1 6speed
just a thought, as i did not notice anyone mentioning this, and sorry if i missed it if they did mention the blend door. Its a door within the duct that diverts the air from either the a/c evaporator and/or the heater core.... so it doesn't blow hot air when the a/c is on, or cold air with the heater on.... if you took the map pouch panel off, you'd see the lever on top of the duct. I have had issue with the wire going to it come off, or not work at all when you roll the heater selector.... i'll link a video showing how to replace the heater core, and you can see the small lever with the wire(push/pull type wire) that opens/closes the blend door... it can be seen around the 3 minute mark... http://https://www.youtube.com/watch?v=83s8HnUPcIU
|UPDATED|4/24/2018 5:24:28 PM (AZT)|/UPDATED|
https://www.youtube.com/watch?v=83s8HnUPcIU
|UPDATED|4/24/2018 5:24:28 PM (AZT)|/UPDATED|
StingrayJim 
NCM Lifetime Member #1936
Stingray's '76���������������������������� StingrayJr's '78���������������������������Lil Red '94 
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stingrayjim jr said:
just a thought, as i did not notice anyone mentioning this, and sorry if i missed it if they did mention the blend door. Its a door within the duct that diverts the air from either the a/c evaporator and/or the heater core.... so it doesn't blow hot air when the a/c is on, or cold air with the heater on.... if you took the map pouch panel off, you'd see the lever on top of the duct. I have had issue with the wire going to it come off, or not work at all when you roll the heater selector.... i'll link a video showing how to replace the heater core, and you can see the small lever with the wire(push/pull type wire) that opens/closes the blend door... it can be seen around the 3 minute mark... http://https://www.youtube.com/watch?v=83s8HnUPcIU
https://www.youtube.com/watch?v=83s8HnUPcIU
Thanks! I'll check that soon as I can.
stingrayjim jr said:
just a thought, as i did not notice anyone mentioning this, and sorry if i missed it if they did mention the blend door. Its a door within the duct that diverts the air from either the a/c evaporator and/or the heater core.... so it doesn't blow hot air when the a/c is on, or cold air with the heater on.... if you took the map pouch panel off, you'd see the lever on top of the duct. I have had issue with the wire going to it come off, or not work at all when you roll the heater selector.... i'll link a video showing how to replace the heater core, and you can see the small lever with the wire(push/pull type wire) that opens/closes the blend door... it can be seen around the 3 minute mark... http://https://www.youtube.com/watch?v=83s8HnUPcIU
https://www.youtube.com/watch?v=83s8HnUPcIU
Okay, I pulled the right-side dash and found the lever. The cable is hooked to it, and it did move when I moved the heater controls, but after a bit it no longer moved. Don't know why.
I did notice that the vent to the left front on the heater box did not move at all. I assume this opens depending on the vent setting to direct heat to the front ducts (the duct work is missing on this car). I could open it manually, and felt air coming from the opening. I assume with this closed the air is going mostly to the defroster vent. Not sure if there is a vacuum issue or what. . .
I'll try to post a picture of the vent I'm talking about:
Wow, I actually got an image uploaded. . .
in Forum: C3 Cooling and Heating Systems
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