Confused - 1976 911s AC & Heating Questions

[dicarn]

Hi all, I need a little help after reading and researching for the last few days. I am currently restoring my 1976 Targa 911s and I am having trouble establishing what the car should have....

I have what looks like an AC Evaporator/compressor (?) in the front bonnet well (see photo), I have a cylinderal tank of some sort mounted at the REAR of the FRONT right hand wing, I have what looks like mounting brackets at the FRONT of the FRONT right hand wing with the horn in front of it, there is a rectangular tank at the FRONT of the FRONT left hand wing.

There is no evidence of pipes or mounts in the engine bay running to a condenser that would have been mounted on the underside of the spoiler if AC was fitted. There is no evidence of pipes running to the mounting brackets at the front of the FRONT right hand wing, there may have been a blower being mounted in front of the spare wheel (see photo), but I do have an air plenum mounted underneath the dash (4 vents with the dials in the middle).

Can anyone tell me what is going on here? I thought ac compressors were mounted in the engine bay on the righthand side (I only have the mounting brackets on the left for the smog pump). Is there only the one blower for the normal hearing system attached to the air plenum box under the front windscreen?


Please help, so confused.

[dicarn]

this is the other photo

[dicarn]

[Nditiz1]

So the item in your smugglers box there is the evaporator blower. The cylinder in your front fender is most likely the drier. The rectangular box in the front of the fender is your washer bottle. On the right hand side where you horns are located, the brackets here are for a trombone oil cooler or the tube style oil cooler, carrera style had not yet been invented. If you have a cut out in front of the spare tire then at one time there was a blower and front condenser. If not then you would have had a condenser mounted to your decklid. Most likely all the lines were removed at some time as was the compressor and decklid condenser.

[dicarn]

Originally Posted by Nditiz1

So the item in your smugglers box there is the evaporator blower. The cylinder in your front fender is most likely the drier. The rectangular box in the front of the fender is your washer bottle. On the right hand side where you horns are located, the brackets here are for a trombone oil cooler or the tube style oil cooler, carrera style had not yet been invented. If you have a cut out in front of the spare tire then at one time there was a blower and front condenser. If not then you would have had a condenser mounted to your decklid. Most likely all the lines were removed at some time as was the compressor and decklid condenser.

That is concise answer - thank you, not that you say "cut out in front of the spare tire then at one time there was a blower and front condenser" I think that accounts for the welded panels in the second photo. Now I need to think about reinstating the AC or not...but that is a question for another time.

[dicarn]

Originally Posted by Nditiz1

So the item in your smugglers box there is the evaporator blower. The cylinder in your front fender is most likely the drier. The rectangular box in the front of the fender is your washer bottle. On the right hand side where you horns are located, the brackets here are for a trombone oil cooler or the tube style oil cooler, carrera style had not yet been invented. If you have a cut out in front of the spare tire then at one time there was a blower and front condenser. If not then you would have had a condenser mounted to your decklid. Most likely all the lines were removed at some time as was the compressor and decklid condenser.

Am I right that there is only one blower in the car for the normal heating system (under the front windscreen)?

[Nditiz1]

Yes and no. So the blower up front will help to pull in the heat from the engine/floor, but only if the heat gets there. It gets there by a blower in the engine bay. A lot of people, myself included, have done away with that rear engine blower setup for a cleaner backdate approach using only the cooling fan to push the heat through the car. Drawback is sitting at a light produces little heat flow, but that never bothered me.

Going back to your second pic, it is difficult to tell without a zoomed out picture. Those might be the factory welded spots for underneath the battery location.

[75 911s]

No, there is a heat blower motor mounted on the left side of the engine (unless it was removed) Send a pic of the engine bay. The condenser was usually in the rear decklid.

[dicarn]

Originally Posted by 75 911s

No, there is a heat blower motor mounted on the left side of the engine (unless it was removed) Send a pic of the engine bay. The condenser was usually in the rear decklid.

Hi, here are the photos of the engine bay

[Dr J]

The first picture shows an empty compressor bracket. If you want ac, you will have to get a compressor. The last 3 photos show that you do not have the heater blower. I strongly recommend you close off the tube you see in the lower/middle left side of the last picture. That would have been connected to the heater blower but having it open like that will let air from the engine cooling fan escape and not cool the engine.

I also recommend you cover the fuse box on the left in the engine bay as some of those wires have 12V, and you can easily short something out.

[dicarn]

Thanks Dr J, the car is not being run at the moment (though it does run) as I want to sort all these little questions out, when I do I will plug the whole and cover the fuse box.

The car is a J Series 911s body with a H Series 911s engine. I beginning to think it was raced with the original engine (which blew) and the current one was put in it and sold. That is my best guess to date.

Thanks for everyone's help.

[Bucketlist]

Follow the advice from these guys on your heating and blower motor questions then ask are you really going to restore this car or is your goal to have a good driving car with a/c. New state of the art a/c compressor, condenser, evaporator and hoses will work much better than the original 40yr old ones. Look into a complete kit from one of the classic a/c suppliers or you could look into:
https://forums.pelicanparts.com/porsche-911-technical-forum/921754-classic-retrofit-lightweight-electric-air-conditioning.html
which many are doing these days.
I did a kit in 2014 which has served me well, here is the link to my old thread:
https://forums.pelicanparts.com/911-930-turbo-super-charging-forum/842475-retroair-complete-system-my-non-c-car.html
Good luck!

[dicarn]

Thanks Bucketlist, this is the exact question I am dealing with at the moment - restore to factory or have a really reliable, well running and comfortable car. I am starting to lean toward the latter. Thanks for your links, they will prove helpful.