Comprehensive guide to converting from A/C to heat only? - Chevelle Tech
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post #1 of 5 (permalink) Old May 2nd, 14, 3:56 PM Thread Starter
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Chris
 
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Comprehensive guide to converting from A/C to heat only?

Do we have a comprehensive guide to converting an A/C car to a heat-only car?

I have a '69 El Camino that was a factory air car and I'm in the process of ditching the A/C. But, this is the first time I've done anything like this, so I want to make sure I have all my bases covered. To save me reinventing the wheel -- or more importantly, to save me from inventing the square wheel -- has someone done this already?

This is what I think I've removed:
  • Removed giant A/C box in engine bay
  • Removed heater water valve
  • Removed compressor, accumulator, receiver/dryer
This is what I think needs to be swapped:
  • Swap A/C box in engine bay to heater-only box
  • Swap A/C control box to heater control box
  • Swap A/C blower motor switch to heater motor blower switch
  • Swap A/C blower motor resistor to heater-only resistor
Is there other stuff that needs to be done? I noticed that the blower motor for an A/C car has a vent to cool the motor, whereas non-A/C cars don't seem to have that vent. I've already got that sorted out, though.
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post #2 of 5 (permalink) Old May 2nd, 14, 5:09 PM
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Re: Comprehensive guide to converting from A/C to heat only?

Because the firewalls are different on AC vs NonAC cars and the heater box inside is different, save yourself some grief and use one of the aftermarket ac delete boxes, like this one:http://www.ss396.com/chevelle/AXB-9B.html
The rest of the stuff on your list won't have to be done.
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post #3 of 5 (permalink) Old May 2nd, 14, 5:35 PM Thread Starter
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Chris
 
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Re: Comprehensive guide to converting from A/C to heat only?

Quote:
Originally Posted by Alan F View Post
Because the firewalls are different on AC vs NonAC cars and the heater box inside is different, save yourself some grief and use one of the aftermarket ac delete boxes, like this one:http://www.ss396.com/chevelle/AXB-9B.html
The rest of the stuff on your list won't have to be done.
Alan, that's the box I have in my car now. I'm actually in the process of gutting the interior (due to rusty floors) this week so I want to make sure that there's nothing else I need to change.

I guess I should have realized it, but the A/C control unit is considerably different to the heater-only unit.

Do I need to reconnect the vacuum pods down at the bottom of the kick panels? What about the one in the windshield cowl?
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post #4 of 5 (permalink) Old May 2nd, 14, 8:17 PM
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Re: Comprehensive guide to converting from A/C to heat only?

I was actually headed down that road with my current '69 project before I decided to just bite the bullet and spend the money on my AC system. You should be able to just install that box and leave everything else under the dash alone. That's what my plan was. IMO it is just not worth the effort to try to eliminate the AC stuff. The heat/defrost will work. Ditto the Astro Ventilation. Most importantly, you will be able to isolate the heat from the vent air register. You just won't be able to add any chilled air.
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post #5 of 5 (permalink) Old May 4th, 14, 3:06 PM Thread Starter
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Chris
 
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Re: Comprehensive guide to converting from A/C to heat only?

I forgot one other thing that I removed - the vacuum tank in the engine bay.

Now I need to figure out the routing for the existing vacuum pods etc.
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