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#1
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1970 grand prix ac help
My 1970 grand prix sj has auto temp control ac. It is missing a lot of the parts so I was going to go to standard ac controls. Is it as simple as changing the controller and wiring?
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#2
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Sort of, the cooling and heating components themselves are the same between manual AC and ATC. To convert you need the control head from a manual AC car plus all the cables, vacuum and electrical wiring along with the actuators that mount on the inner AC-heater box itself. The ATC controller is just bolt on and removing it exposes all the mounting positions to install the manual controlled levers onto it (the AC heater box-inside and out re the same).
This would be a challenging conversion without a donor car or at least a complete donor system removed by someone who understood what you needed.. Having an electric rear defroster will also complicate things as it's wiring harness was integrated with the AC one. (they have relay interlocks).
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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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Could probably strip ATC from a Caddy.
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#4
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Quote:
It is not overly complicated technically to do it but involves a few different harnesses and you need to be able to look at the factory wiring diagram to make the correct connections. I did a complete conversion back in the 80's on my 1st 69 SJ automatic. Went from manual AC to auto temp control. The former junk yard that is currently Frank's Auto Parts in 29 Palms CA sold me the entire AC system out of a wrecked 70 GP for $50. I did the change over while I was in the Marines out there. System actually worked correctly for about 8 months. I was very proud of that project. Gonna change my current 69 SJ 4 speed car from auto temp to manual AC at some point in order for the AC to actually work. The 50+ year old electronics in auto systems is difficult to keep working.... Bruce Be happy to coach you is needed... Sent from my SM-G970U using Tapatalk
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1963 Bonneville SW 421HO 1967 Bonneville SW 400 1969 GP 428 4spd 1970 GTO 400 4spd 1970 Bonneville SW 455 1971 GP 400 4spd 1971 Grandville Conv 455 1972 Catalina Conv 455 1972 Grandville Conv 455 |
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