Remove Heat But Keep AC

[Taxi!]

I live in South Florida and don't need heat or defrost in my weekend driver but would like to keep the A/C on my 86 Coupe for the time being. I've already backdated the engine compartment but what I'd really like to do is remove any non-essential heat components in the cabin or frunk but keep the A/C components. I'm sure someone has done this before. I searched but couldn't locate any relevant threads.

Am I correct in my understanding that the dash controls, footwell blower motors and the cowl blower are only related to the heat or fresh air ventilation, while the blower in the smuggler's box is part of the A/C? If not, could someone kindly identify which components are only used for heat and whose removal won't affect the operation of the A/C? Thanks in advance.

Jeff

[DRACO A5OG]

Actually the levers between seats control the foot blowers then the dial control the speed of the engine bay blower motor. The dash levers are for direction of fresh and hot air flow.

So you would remove the engine Blower Motor, Long Banana like tube and plug the stainless steel inlet for the heat exchangers or remove those as well and the aircraft orange tubes to the flapper boxes, but I suggest plugging those as not to get exhaust into the cab.

[ganun]

I am in so fla too, and my 2 cents from someone who put headers thus no heat, is that a heat backdate with no footwell blowers is better than no heat at all. I removed the blowers and had map pockets made, backdate look, to get more leg room. Blocked off all heat ducting but have fresh air and a/c.
If you still have the h.e. No need to eliminate all heating capability.

[Taxi!]

I appreciate the responses and think that maybe I didn't explain my goal. While not trying to gut my car for the track, I am trying to remove unnecessary parts that contribute to the gross weight and are likely to require repair or replacement at some point in the future anyway. (I know that the A/C fits this description but am not ready to give that up quite yet.) So I've removed the blower from the engine compartment and would like to continue with the rest of the heating and fresh air systems In the cabin and frunk. Thanks in advance to anyone who can confirm my undrstanding of which parts those are in my first post.

[Jack Stands]

I think if you try to replicate the parts from a '74 911, you'll have what you want. If you already have SSI Heat Exchangers, I would just eliminate the blowers and use the engine cooling fan to push the air for heat, or simply use block off sheet metal on the engine if you really don't want to have any heat plumbing. In that case, sell the SSIs and get some headers.

[Taxi!]

Thanks, Jack. I may eventually get headers, but right now I'm more interested in eliminating unnecessary components. I don't need any heat, as the temp where I live averages about 80 degrees year round. I just want to simplify the interior and frunk. So are you saying I can take out the blowers and plumbing, except the one in the smuggler's box, and still have A/C?

[Jack Stands]

That's how it was done back when the 911 was simple. All those blowers were put into the design in an attempt to keep the heating system up to date with more modern designs, but have no real benefit for the AC system. The footwell blowers may be of benefit for defrosting, but the AC will work with just the blower in the smugglers box, and the one in the front trunk condenser.

[kuehl]

Jeff,

There are quite a few unnecessary, subjectively naturally, items you could pull out and put in storage. If you put weight reduction as the primary prerequisite, and 'function' as the secondary, there is a long list. You may want to consider 'lawful' as the primary in a scenario where, say, if your car does not require annual state inspections; a car that is registered as 'historical for example. A grey line is removal of the cat pipe, maybe 12 lbs of weight, and when they fail that's a lot of bucks too.

Weight wise, a gallon of gas weighs about 6.3 lbs.

The windshield water bottle in the LH front fender, weighs in at about 19.29 lbs when full, it's a 2 gallon bottle. You could swap it out with a 1 quart after market system; and usually around this time period the oem pump attached to the oem bottle tends to fail.

On heating and AC you brought up:
Remove one of your footwell blower motor carpet covers. You will see a 'manifold' attached to the top of the blower motor assembly. It connects the heat system, fed from the rocker, into the side vent, as well the AC vent ties in here. If you want to discard the footwell blower system you'll need to re-design a simple connection for the AC air tube to the side vent. Removing the engine bay blower motor disrupts the circuit for footwell blowers, you will want to read this thread if you go down that road:
Carrera - Removing Engine Compartment Heater Blower
On my 87 cab, I removed the engine compartment blower to allow for room, a custom supercharger. Since I still need heat in my climate I left the footwell blower system in place, tied in the power from our Kuehl Variable Speed Fan controller through a 'seaonal switch'; power to the evap motor in summer, or footwell blowers in the winter.

If you are deleting the engine bay blower you could remove the heater box 'air distributor tube' that connects the two exhaust heat exchangers, another maybe 3 lbs in weight drop; you will have to cover the hole in the engine tin where it rose into the engine bay.

On a side note with the engine bay blower in your era model, I believe there is a circuit that turns on the blower motor when engine temps reach a certain threshold; frankly I've never heard it turn on in my car when it was a stock 3.2.

The cost/benefit of SSI's vs. stock vs. an aftermarket set of headers without heat exchangers is discussed in quite a few threads in PP, well worth reading.

I'm going a bit off your objective in the thread here but just letting you know there are other "things" to look over or ponder, and I'm sure you will find hundreds of threads here in PP on weight reduction.