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#1 |
Registered User
Join Date: Oct 2009
Location: Salvisa, Ky
Posts: 131
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
1979 C65 really low mileage ex-firetruck. Looks like dealer add-on A/C, maybe this will help you.
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#2 |
Registered User
Join Date: Oct 2009
Location: Salvisa, Ky
Posts: 131
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Great job, I have done this changeover and small fingers really would help! Where are you planning to get the vacuum to operate the controls?
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#3 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Installed the dash vents to the dash pad using six plastic nuts. Installed new foam seal on dash duct. Installed A/C Heat control, hooked it to both wire and vacuum harness. Note, I removed the radio before installing duct work to give me better access. Installed padded dash and instrument cluster bezel.
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#4 |
Registered User
Join Date: Jan 2012
Location: Motown
Posts: 7,680
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
nice job
![]() amazed that gm had 2 firewalls for a truck ac and ac delete why you didn't convert it over to r134? all you had to do was solder in a new expantion valve then go with a new compressor, dryer and hoses
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cool, an ogre smiley ![]() how to put your truck year and build thread into your signature shop air compressor timer |
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#5 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Thanks, yes I am planning on converting it, I have flushed the oil and have adapters to go on the low and high side ports. I am going to make new hoses that will be the barrier type for 134A.
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#6 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Next I installed the A/C configured glove box. I had to change the plastic pocket from the donor door to my original door. This ended up being more difficult than I imagined. The lock has tumblers that have to be released. This is accomplished with a paperclip inserted into the hole in the release knob. Once the tumblers are released then you pull the knob and tumbler assembly out and remove the retaining nut using a hex wrench. Remove the four screws (2 each side) and bend the metal tabs on sides of the glove box door outer metal shell. This will give clearance so the plastic pocket will slide out. Reverse the process to install the A/C style pocket.
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#7 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Installed the lower heater vent today. This vent is attached with a small screw on the passengers side and a bolt with rubber grommet on the drivers side. Note the forward edge snaps to the edge of the heater housing prior to installing the small screw.
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#8 |
Registered User
Join Date: Jan 2012
Location: Iredell, Texas
Posts: 582
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Awesome write up, thanks for the level of detail!
-Richard
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I may have too many Chevys... Is that possible? ![]() 68 c50 pickup build: http://67-72chevytrucks.com/vboard/s...d.php?t=704713 |
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#9 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Got some more done on the A/C conversion. I installed the vacuum controlled hot water shutoff valve. This valve stops the flow of hot water to the heater core when you select max cold on the temperature control. Settings other than max cold allow the heater core to operate to provide blend air for temp control.
I also got some more done on the interior. I installed a new dash pad and door cards. I purchased the door cards from LMC. They fit and look awesome. |
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#10 |
Registered User
Join Date: Oct 2010
Location: Ocean Springs, MS
Posts: 1,746
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Did the dash pad also come from LMC? What color did you specify? That looks like what I need.
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Gary 1971 Chevrolet C/10 1951 GMC 100 1977 GMC C15 1955 Chevrolet 3100 |
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#11 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
No, I purchased it from Classic Industries, it is Carmine red. It fits real good as well. Just be sure to save your clips from the old one.
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#12 |
Registered User
Join Date: Oct 2010
Location: Ocean Springs, MS
Posts: 1,746
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
I need a new dash pad and door panels for my 77, and the original color looks like what you installed. I have been watching other people's projects to see how the look and where they got them before I buy any. Yours looks like the right stuff. Thanks!
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Gary 1971 Chevrolet C/10 1951 GMC 100 1977 GMC C15 1955 Chevrolet 3100 |
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#13 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
I was able to tap into the line that feeds the vacuum gauge. The truck has vacuum boosted brakes which is supported by a Bendix engine driven vacuum pump. Thanks for the pictures.
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#14 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Got the A/C compressor bracket installed, next will mount the actual compressor and belt.
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#15 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Mounted the compressor and installed the condenser. Condenser bolts directly to the radiator support with 4 small bolts.
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#16 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Got the connections to the condenser installed. I noticed these lines are steel on the medium duty trucks and aluminum on pickups. Guess the steel take vibration better.
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#17 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Got some more done on the truck, reinstalled the seat and seatbelts. Next is installing the a/c lines from compressor to evaporator and condenser.
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#18 |
Registered User
Join Date: Sep 2009
Location: Beaverton, OR from WA State
Posts: 1,515
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
It's so rare to see a medium duty looking so good. Love the updates, thank you for sharing your work.
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Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 |
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#19 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Thanks, I appreciate your comment.
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#20 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Started disassembly of the truck to repaint the exterior back to its original color. Upon removal of the right side (passenger) fender extension I discovered a rust problem between the extension and support brace. Water had collected over the years and caused the fender extension metal to rust away in the vicinity of the support brace. My son Noah assisted me in removing the rusty metal and welding in new replacement metal. It turned out real good. He plug welded the brace back onto the extension and it's ready for primer and finish sanding.
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#21 |
Registered User
Join Date: Sep 2009
Location: Beaverton, OR from WA State
Posts: 1,515
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Hey, good to see an update. Glad you're still making progress on it. Is that brown color the original you refer to? Will you and Noah be building the flatbed for it as well? Dovetail or straight? I went back through and read the first post...this tractor collection you speak of, I hope there is some green in there.
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Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 |
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#22 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
The original color was white, the truck was owned by a distribution company and had a 24' van box on it. It appears the brown color was a "company" color for their fleet of trucks. I think it was originally painted when it was new. The plan is to paint it white and install a rollback bed. I have been trying to buy a used rollback, however the good used beds bring more money that I am willing to pay. I am strongly considering building my own rollback unit using a factory flatbed. Would just have to fab a rollback interface between the truck frame and the flatbed. Noah is very talented and a great help (see thesamba.com link below), so I know he will be very involved. Here are some links to help answer the color of tractor question.
http://www.thesamba.com/vw/forum/viewtopic.php?t=439103 Link to youtube tractor videos: https://www.youtube.com/watch?v=_ZzyJXSFvYM https://www.youtube.com/watch?v=6RdUcBhWIWE |
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#23 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
I know this does not pertain to A/C installation, however I will post the truck transformation / restoration here to keep it all in one thread. Got the bumper and lower front grill painted and reinstalled. I will paint the fenders and fender extensions next. My shop is not large enough to allow me to paint the entire truck at once, so I will do it in several stages. The color code is White 12S / White 12P. Not sure the difference between S and P, however both translate to Frost White, more recently called Linen White. I am using single stage DuPont (Nason) Urethane.
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#24 |
Registered User
Join Date: Apr 2014
Location: California
Posts: 946
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Great progression, man. Keep it up!
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#25 |
Registered User
Join Date: Oct 2016
Location: Powderly Texas
Posts: 305
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning
Thanks!
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