a/c delete retain heat?

Discussion in 'Tips 'n' Tricks Topic' started by AMPZ28, Apr 26, 2020.

  1. AMPZ28

    AMPZ28 Member

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    Hello, I have an a/c car that im trying to convert to just heat. I have an a/c delete cover that retains the fan housing for the heater. My question is, can i use my a/c heater hvac box or do i need a box from a heat only donor? Or maybe there is a thread on this somewhere already? Basically what parts should i retain and what parts should go? Thanks.
     
  2. BonzoHansen

    BonzoHansen Administrator Lifetime Gold Member

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    You keep everything under the dash with an AC delete cover.

    A non ac car has a different firewall
     
  3. AMPZ28

    AMPZ28 Member

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    Okay good. Yeah i noticed the opening is less vertical on a heat only firewall as well as the heater core pipes exit more towards the right of the firewall. Do the fresh air vents need to remain in the upper cowl?
     
  4. Zspoiler

    Zspoiler Veteran Member

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    image2.jpg I kept mine heater core went I deleted mine .I just used a non AC heater box and fan
     
  5. BonzoHansen

    BonzoHansen Administrator Lifetime Gold Member

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    I would but I guess it doesn't matter


    BTW this is from the 'sticky' post in the body section: http://www.nastyz28.com/forum/threads/true-z28.309515/#post-3537919

    that shows the difference in firewalls. of course all under dash is different too.
     
  6. Scott51

    Scott51 Veteran Member

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    There are a few threads in the electrical forum but like bondo said you can reuse everything under the dash and it’s pretty straight forward.

    You’ll also need to reuse your blower motor relay and if you want multiple speeds, the blower motor resistor. I’d recommend picking up a new one like this https://www.classicindustries.com/product/1977/chevrolet/camaro/parts/3929052.html and installing it on the bottom of your AC delete next to the blower motor fan because it needs to be cooled by the moving air.

    If you want a bare bones heat only setup, you can also strip the internal box to a shell with nothing but the heater core and metal door that the temp control slider operates. Glue the door shut in the hot position, blank off all other outlets except for the windscreen defrost feed.

    Remove all of the ducting except for the defrost piece, ditch the factory heater controls/resistor/ wiring loom and hook up a 2 pole toggle switch with standard 12V relay to the blower motor. If you’re a little OCD like me you can recycle the factory wiring loom to use the original fuse and wire.

    You’ll end up with a ton of space under the dash, a bit of lost weight, less rattles and a defrost system that works better than the factory setup ever did, as well as heating up the interior. Perfect for a street strip or street track car!
     
  7. Sporz32

    Sporz32 New Member

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    Nice! I went with an AC Delete "kit" and a new blower motor. I struggled a bit but got similar results. Unfortunately I don't have hot air channeling up to the windscreen but I have heat at all blower motor speeds. I relocated the relay and resistor.
     

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  8. 73 Z

    73 Z Veteran Member Gold Member

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    The upper cowl vents direct air down and thru the rockers. If you block off on a daily or non garaged driver it'll condensate and rust inside out.
     
  9. Oldskool62

    Oldskool62 Member

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    Guys I got one of these A/C delete panels with no mounting holes. I was reading that you use a windscreen sealant to mount. surely you would have to drill holes and mount with bolts?
    [​IMG]
     
  10. Eric Meschke

    Eric Meschke EM

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    I have a similar issues to this thread with an AC delete for an originally AC car. Recently took out the interior, and the jute padding on the passenger side was wet with anti-freeze, which confirmed a heater core leak. The engine was replaced some years ago and the AC was not re-connected. I don't really care if the AC works, so it would be nice to put in the AC delete kit and that is a good thing to do if the heater core is getting replaced anyway. Especially since the seats and carpet are still out from the interior redo.

    There is a mechanic down the street who I trust who will do the work, but he prefers for me to bring the parts since it is a pain for their shop to deal with ordering the old stuff--that is good for me too for saving money. Trying to put together a parts list:

    --AC delete kit (is it worth paying for the more expensive one?)
    https://www.rickscamaros.com/camaro-air-conditioning-delete-box-1970-1981.html
    --Blower motor (mine still works, but why not when the car is apart)
    https://www.rickscamaros.com/camaro-air-conditioning-fan-blower-motor-1982-1988.html
    --Blower motor resistor (again why not replace)
    https://www.rickscamaros.com/1970-1971-camaro-blower-motor-resistor-with-a-c.html
    --Firewall insulation (is it possible/easy to replace this since I think the dash is loosened and the old stuff smells?)
    https://www.camarocentral.com/1970_1981_Camaro_Firewall_Insulation_Pad_with_Air_p/int-485.htm
    --Heater core for AC car (the one for an AC car because the delete kit just keeps the original setup, right?)
    https://www.rickscamaros.com/camaro...for-cars-with-air-conditioning-1970-1981.html

    Is there anything else that should be replaced if the mechanic is doing the heater core and AC delete--kick panel actuator, heater core pipe grommet, relay, etc? It is a little tricky figuring out what to buy in advance of taking the car in, and I don't completely understand how it all works.

    Any thoughts are great and thanks in advance!
     
    Oldskool62 likes this.

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