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#1
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Factory ac questions
So ive got a 69 lemans that was a non-ac car that im installing the factory ac system in and have a few questions. Ive got a few templates for cutting the firewall but still have a few questions. On the underdash box, there two holes and the top and bottom that have holes but no bolts. From the looks of it these holes would be inside of the firewall case so i cant imagine there should be bolts there. Maybe some kind of alignment pins? Anyone know what the holes are for? ( see the attached pic. Holes are circled.) Second question is can someone take a measurement before the top of the firewall box and the lip of the cowl so i know if my marks put the box in the right place (see the other attached pic of when i need the measurement. ) thanks for your help guys!
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#2
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I'll try to get some measurements and pics tonight.
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My Break Away Squad 1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops) 1969 LeMans (2dr & 4dr Hardtop and a Cvt) 1969 LeMans Safari 2 seat Wagon 1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop) 1969 Catalina (3 Cvt’s & a 2dr hardtop) 1969 Ventura 2 Seat Wagon 1969 Executive 4dr Sedan 1969 Bonnie Cvt 1969 Bonnie 3 Seat Wagon (2 of them) 1969 Bonnie Brougham (4dr Hardtop & Cvt) 1969 Grand Prix SJ (2 of them) 1969 2+2 2dr Hardtop (Canadian model) |
#3
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Thank you! I appreciate it.
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#4
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Since you’re adding ac to a non ac car, I assume originality isn’t your first priority. (Assuming only, not judging)
I have a factory ac 71 firebird that I did a resto mod and painstakingly reconditioned the factory ac and it was the biggest mistake of my project. This spring, ripping it all out and putting in an aftermarket system. Not even a close decision. My 2cents
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462 Yc Block, zero deck Probe forged pistons 6cc relief, Scatt Hbeam rods floating pins aprox. 10.21 CR Comp Hyd-roller cam,roller lifters,springs ect. 236 244@ .050 108 LSA .511 lift, duration 289,297 @.oo6 Edelbrock Aluminum 87cc round port heads Larger valves ,ported polished and cut Powerjection3,T2 manifold, Try-y’s Flowcooler water pump. 71 formula with TKO600,hydraulic clutch 3.42 posi and 26 inch tire. 17x9 YO Honeycombs with Nitto 555's |
#5
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Yea, i added a 72 AC system (complete. & working) into my 68 GTO non-AC 4- Speed car. Cut the firewall per 72 template, and hooked itall up nice.
Never charged it. Took the compressor off. Now Kinda looks like my 1st GTO underhood. Last edited by Half-Inch Stud; 12-18-2021 at 03:14 PM. |
#6
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Definitely not worried about orgninalality. Its technically a lemans that will be cloned into a gto and ill be resto moding it. One of the big factors for going wirh the original system is i got a complete working system for 100 bucks. Hard to pass on that. I also worked at a classic car dealership for several years so ive delt with both the original system and even installed several aftermarket ones. I can say, if done right, with a few modifications/changes and charged with r12 the original systems will always blow colder then any aftermarket system ive ever delt with. They can definitely be a bit finicky compared to the new systems and the plan was to go aftermarket until i came across this set up and for the price, i couldn't pass it up. Out of curiosity, what didn't you like about the original system.
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The Following User Says Thank You to pontiacman63383 For This Useful Post: | ||
#7
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Big bulky, ugly. Ductwork fragile and leaky no matter how I tried to keep it together. Vacuum operated controls and mixing doors vs lower vacuum signal. Just a jenky system and on a good day worked like garbage. Imho just outdated technology that may have been cold, but distribution and mixing always sucked.
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462 Yc Block, zero deck Probe forged pistons 6cc relief, Scatt Hbeam rods floating pins aprox. 10.21 CR Comp Hyd-roller cam,roller lifters,springs ect. 236 244@ .050 108 LSA .511 lift, duration 289,297 @.oo6 Edelbrock Aluminum 87cc round port heads Larger valves ,ported polished and cut Powerjection3,T2 manifold, Try-y’s Flowcooler water pump. 71 formula with TKO600,hydraulic clutch 3.42 posi and 26 inch tire. 17x9 YO Honeycombs with Nitto 555's |
#8
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Here are a few pics from a project that I started back in 2011, 68 LeMans. Had the Evaporator flushed, acid washed, leak checked, Compressor rebuilt and installed new a Hearer Core and that's as far as it progressed.
it appears that the red circled holes in your pic are for larger sheet metal screws. Let me know it you need any other details. Dave
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68 GTO 68 LeMans 68 LeMans Convertible 79 Firebird |
The Following User Says Thank You to dmorg1 For This Useful Post: | ||
#9
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I cut mine the simple way. I had to strip my fiber glass shell anyway so I put empty shell on firewall . Blower motor hole mounts perfect. Than mark &drill mounting holes . Slide in inside box . That gives you hole to cut & were to wield patches
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#10
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Quote:
95 Lincoln towncar vents/defrost/floor are fantastic and quiet. Give me an idea on grafting that blower motor. |
#11
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Yeah, I’m sure for some it’s optimal but for me I spent a lot of money on new condenser, new evaporator, new blower, lines, compressor poa update and meh.
Like I said, all comes out this spring and starting new w vintage air. Good luck either way!
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462 Yc Block, zero deck Probe forged pistons 6cc relief, Scatt Hbeam rods floating pins aprox. 10.21 CR Comp Hyd-roller cam,roller lifters,springs ect. 236 244@ .050 108 LSA .511 lift, duration 289,297 @.oo6 Edelbrock Aluminum 87cc round port heads Larger valves ,ported polished and cut Powerjection3,T2 manifold, Try-y’s Flowcooler water pump. 71 formula with TKO600,hydraulic clutch 3.42 posi and 26 inch tire. 17x9 YO Honeycombs with Nitto 555's |
#12
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Here are a few pics of an installed jacket. Space between the underside of the firewall lip and top of the jacket is 0.4”.
However, in your situation I would simply mount the jacket reusing the bolt holes around the blower portion of the firewall [tucked in to the fender area] and then placed the jacket on the firewall and tweak it so that it looks nice and level and then mark the holes you’ll need in the area behind the passenger cylinder head.
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My Break Away Squad 1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops) 1969 LeMans (2dr & 4dr Hardtop and a Cvt) 1969 LeMans Safari 2 seat Wagon 1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop) 1969 Catalina (3 Cvt’s & a 2dr hardtop) 1969 Ventura 2 Seat Wagon 1969 Executive 4dr Sedan 1969 Bonnie Cvt 1969 Bonnie 3 Seat Wagon (2 of them) 1969 Bonnie Brougham (4dr Hardtop & Cvt) 1969 Grand Prix SJ (2 of them) 1969 2+2 2dr Hardtop (Canadian model) |
The Following User Says Thank You to north For This Useful Post: | ||
#13
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As for the Relative ability of a factory AC system all I can say is I’ve driven these cars for 40 years and a properly functioning factory 60s GM Air conditioning system filled with R12 keeps the car wonderfully cool in any weather. Most complaints about fan speed typically are actually a problem caused by 50 years worth of gunk blocking the heater core and or the evaporator Thereby restricting airflow.
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My Break Away Squad 1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops) 1969 LeMans (2dr & 4dr Hardtop and a Cvt) 1969 LeMans Safari 2 seat Wagon 1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop) 1969 Catalina (3 Cvt’s & a 2dr hardtop) 1969 Ventura 2 Seat Wagon 1969 Executive 4dr Sedan 1969 Bonnie Cvt 1969 Bonnie 3 Seat Wagon (2 of them) 1969 Bonnie Brougham (4dr Hardtop & Cvt) 1969 Grand Prix SJ (2 of them) 1969 2+2 2dr Hardtop (Canadian model) |
#14
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Thank you dmorg1 and north for the pictures. Thats exactly what i was needling.
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#15
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This is my firewall a 70 gto heater car it's not that complicated. Um going fac. A/c also . The heater hoses , its just a elongated hole
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#16
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I did the conversion back in the 90’s to a judge I was daily driving. One issue is the air inlets on non AC cars that feed the upper dash vents. They interfere with the AC ducting to those dash vents. You’ll have to chop them off and seal the holes from the plenum well because that’s a high pressure zone so rain while driving will end up in car.
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My Break Away Squad 1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops) 1969 LeMans (2dr & 4dr Hardtop and a Cvt) 1969 LeMans Safari 2 seat Wagon 1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop) 1969 Catalina (3 Cvt’s & a 2dr hardtop) 1969 Ventura 2 Seat Wagon 1969 Executive 4dr Sedan 1969 Bonnie Cvt 1969 Bonnie 3 Seat Wagon (2 of them) 1969 Bonnie Brougham (4dr Hardtop & Cvt) 1969 Grand Prix SJ (2 of them) 1969 2+2 2dr Hardtop (Canadian model) |
#17
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#18
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Depending how thorough you want to be AC GTO’s had…
4 core rad instead of 3 7 blade clutch fan instead of 5 blade flex Different crank and water pump pulleys seals around the frame at the rad support Air dam under rad support 55 amp alternator instead of 37 3.23 diff instead of 3.55 Ambient air sensor on passenger side top of rad support Extra vacuum fitting of carb for AC control head Jumper harness to bring power direct from alternator to compressor and high speed fan Extra dash vent on center of pad Cover plate and specific kick panel on left side Fresh air intake valve and specific kick panel right side Heater core is specific to AC Firewall has specific hole for AC vacuum supply Are you switching dash pads to have the center vent?
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My Break Away Squad 1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops) 1969 LeMans (2dr & 4dr Hardtop and a Cvt) 1969 LeMans Safari 2 seat Wagon 1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop) 1969 Catalina (3 Cvt’s & a 2dr hardtop) 1969 Ventura 2 Seat Wagon 1969 Executive 4dr Sedan 1969 Bonnie Cvt 1969 Bonnie 3 Seat Wagon (2 of them) 1969 Bonnie Brougham (4dr Hardtop & Cvt) 1969 Grand Prix SJ (2 of them) 1969 2+2 2dr Hardtop (Canadian model) |
The Following User Says Thank You to north For This Useful Post: | ||
#19
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#20
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