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#26 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
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Re: Suburban A/C fix + Vintage Air?
Rear AC Wiring Diagram
![]() Rear window wiring diagram. ![]()
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#27 |
Registered User
Join Date: Jun 2009
Location: san francisco, ca (east bay)
Posts: 674
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Re: Suburban A/C fix + Vintage Air?
This is awesome, I also noticed your "fundamentals of air conditioning" link!
Thanks a ton for making all that available! Last edited by swissarmychainsaw; 06-16-2018 at 07:44 PM. |
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#28 |
Registered User
Join Date: Mar 2013
Location: SF
Posts: 345
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Re: Suburban A/C fix + Vintage Air?
hey hey, noticed you were a fellow east bayer, care to share you parts guy? About to start restoring my wifes 73. Also plan on rear ac.
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#29 |
Registered User
Join Date: Jun 2009
Location: san francisco, ca (east bay)
Posts: 674
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Re: Suburban A/C fix + Vintage Air?
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#30 |
Registered User
Join Date: Oct 2014
Location: Scottsdale, AZ
Posts: 465
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Re: Suburban A/C fix + Vintage Air?
I'm late to this as well. But 2 things. Definitely only use AC o rings. and 2, if you do 134a be sure to get the biggest parallel flow condenser you can fit. Okay, actually 3 things. I would use a compressor that's in the 9.5+ cubic feet / revolution area. I don't know if the trailblazer accessories allow it but something like a denso 10s17F or a 10s20F. Many of the compressor you find will be sized for a single evaporator system and will likely be a bit under sized. I suggested the 2 above as they are bigger than your typical Sanden from a cubic feet per revolution standpoint.
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#31 |
Registered User
Join Date: Jun 2009
Location: san francisco, ca (east bay)
Posts: 674
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Re: Suburban A/C fix + Vintage Air?
This is what I bought: https://www.summitracing.com/parts/HLY-20-142
Which comes wit an Sanden SD 7 (no real details on that page though). I have the parts, but not installed them yet... I can't even find details on what "cubic feet per rev" this unit puts out. |
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#32 | |
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Join Date: Oct 2014
Location: Scottsdale, AZ
Posts: 465
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Re: Suburban A/C fix + Vintage Air?
Quote:
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#33 |
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Join Date: Oct 2014
Location: Scottsdale, AZ
Posts: 465
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Re: Suburban A/C fix + Vintage Air?
I just looked at one of the review's on summit racing from the link you sent me, they put a picture of it mocked up on their Camaro. Name plate read SD7B10. Unfortunately that's a 100cc/rev compressor. My opinion, way too small for what you're trying to accomplish. Do you know if the Trailblazer SS is the same offset crank pulley as a standard truck drive?
http://www.sanden.com/pistoncompressors.html |
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#35 |
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Join Date: Dec 2008
Location: Silverhill, Al
Posts: 2,026
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Re: Suburban A/C fix + Vintage Air?
I am in the middle of putting the vintage air in my dash and if it will not cool the Burb off I will be retrofitt a rear air, already grabbed all the parts from a doner... lots of good info on this post! Thanks
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Fuzzy Dice Club Member 87 Crew SWB Build for the crew http://67-72chevytrucks.com/vboard/s...d.php?t=430082 http://www.cardomain.com/ride/3232925 90 burb 2wd Build Thread For The Burb! http://67-72chevytrucks.com/vboard/s...d.php?t=383055 |
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#36 |
Registered User
Join Date: Jun 2009
Location: san francisco, ca (east bay)
Posts: 674
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Re: Suburban A/C fix + Vintage Air?
Ok, it's been a year! Crikey!
I just reached out to Sanden to see of the compressor I have is indeed undersized. No point in installing it, if it's too small! I'm going to lay this out this week and get crack-a-lackin' on this project. PS: I asked my local mechanic if he would be interested in doing some of the work. He said two things to me: 1. You're a lot braver than I am! 2. This sounds expensive! The recent heat wave, and the upcoming July 4th weekend are lighting a fire unner me. Here we go! |
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#37 | |
Registered User
Join Date: Oct 2014
Location: Scottsdale, AZ
Posts: 465
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Re: Suburban A/C fix + Vintage Air?
Quote:
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#38 |
Registered User
Join Date: Oct 2014
Location: Scottsdale, AZ
Posts: 465
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Re: Suburban A/C fix + Vintage Air?
I also had mentioned getting the biggest parallel flow condenser you can fit. That's a must. Also do not get anything thinner than a 1" for dual air. Vintage air has some but Restomod air has a bunch of different sizes too.
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#39 | |
Registered User
Join Date: Jun 2009
Location: san francisco, ca (east bay)
Posts: 674
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Re: Suburban A/C fix + Vintage Air?
Quote:
https://www.rockauto.com/en/moreinfo...=1295591&jsn=1 Construction 6mm Core Depth (in) 7/8 Core Height (in) 16-1/4 Core Length (in) 28-7/8 Inlet Type # 8 Male O Ring Outlet Type # 6 Female O Ring |
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#40 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
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Re: Suburban A/C fix + Vintage Air?
The original engine in your truck was dressed with a Frigidaire Harrison A6. I'd try to come close to the specs on that beast for dual evaporators.
The Harrison A6 compressor was a nearly indestructible beast. It will push out 27,000 BTUs at 2,000 rpm and as high as 42,000 BTUs at 4,000 rpm with a discharge rate of 240 p.s.i. That’s enough cold air to cool a small house (my window-mounted air conditioners are only rated at 5,000 and 8,000 BTUs). They don't care whether you turn em clockwise or counterclockwise they'll work in either direction. Not fuel efficient at all but they moved so much refrigerant around that it would freeze you out of the passenger cabin when the system was properly charged. The compressor that GM put in the 3/4ton suburban with the 6.0L and dual air using Envirosafe refrigerant may get you close to the performance of the A6 with R12. Be aware that Envirosafe is a hydrocarbon blend refrigerant. For those that can't help but mention that hydrocarbon refrigerants burn... R134a & R12 burn too. The byproducts of automotive refrigerant combustion are really nasty. Hydrocarbons don't generate Phosgene or Carbonyl Fluoride gases when they burn. I choose to not melt my lungs and brain.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#41 |
Registered User
Join Date: Jun 2009
Location: san francisco, ca (east bay)
Posts: 674
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Re: Suburban A/C fix + Vintage Air?
Anyone have a picture of the underside of a Suburban? I'm trying to figure out where these hard lines route!
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#42 |
Registered User
Join Date: Jun 2009
Location: san francisco, ca (east bay)
Posts: 674
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Re: Suburban A/C fix + Vintage Air?
Made some progress today. Got the rear unit cleaned up and installed, ran the hard lines under the truck, and some odds and ends.
![]() ![]() Old sensor: ![]() Expansion valves: ![]() ![]() Sensor was different on the new unit, so.... ![]() ![]() Hanging proud: ![]() Manifold: ![]() ![]() Figgered out how to run the hard lines a little bit (thanks to my 10 year old's son's help! LOL) ![]() Old Unit: ![]() ![]() Next up to figure out the switches and stuff: ![]() ![]() Last edited by swissarmychainsaw; 06-15-2019 at 10:09 PM. |
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#43 |
Registered User
Join Date: Jun 2009
Location: san francisco, ca (east bay)
Posts: 674
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Re: Suburban A/C fix + Vintage Air?
And then I cracked a cold one...
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#44 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
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Re: Suburban A/C fix + Vintage Air?
Looks like you have a compressor cycling thermal cutoff switch with a capillary tube in the Evaporator. There should be a Low pressure cutoff switch on the accumulator as well. The aftermarket compressor and or hoses likely has provision for a high pressure cutout switch. If you're running R134a you'll want to add a HPCO switch in series with the LPCO and thermal switches because it has a tendency to run much higher pressures than R12 or HC blends.
I'd use a relay to offload the control amperage to the actual compressor clutch so the high amp load of engaging the electromagnet is run through an easy to replace $1.25 relay rather than the HVAC controls and the LPCO and Thermal switches. Get a relay socket rather than using 1/4" disconnects. It makes the wiring job look better and it's much easier to replace the relay when and if it needs to be done. Run a ground in series through the LPCO, HPCO, and Thermal switch to terminal 85 of a Mini ISO Bosch Automotive relay. Run the Green AC compressor "on" wire from the HVAC control panel to terminal 86 of the same relay. Run a 14ga wire through a 16ga fusible link or a 20A ATC fuse from the J stud on the firewall to the relay common terminal 30. Run a 14ga wire from relay terminal 87 (normally open) to the actual compressor clutch plug.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. Last edited by hatzie; 06-15-2019 at 10:25 PM. |
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#45 | |
Registered User
Join Date: Jun 2009
Location: san francisco, ca (east bay)
Posts: 674
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Re: Suburban A/C fix + Vintage Air?
Quote:
What unit did you go with for the rear? |
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#46 |
Registered User
Join Date: Jun 2009
Location: san francisco, ca (east bay)
Posts: 674
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Re: Suburban A/C fix + Vintage Air?
Here’s what I learned/tl;dr, which is going to sound obvious, and phillipm was totally right:
Spent half the day on the phone and doing some research. I called Restomod Air (condenser) and Vintage Air (compressor), and ended up with “Classic Auto Air”(recommended by Restomod Air) which seems to be the best suited to getting your stock stuff working again. Taking @phillipm advice, I’m going to upsize the Condenser, plus get parallel flow. I verified that the stock size of the Suburban's (’76) condenser is: Depth: 7/8”“Classic Auto Air” suggested the 16x27” CondenserNotice how the OEM has M/F in/out? This is the issue with trying to piece things together and mix and match parts. I was hoping I could order hoses, and just bolt this thing together, but that was a bit of a pipe dream. The good news is that “Classic Auto Air” has all the fittings and the guy assured me that we can just create custom lines where needed (under the hood). He said he’s familiar with the stock components, so putting together a list of parts should be easy. The compressor piece of this had me pulling out my hair. I don’t know why it’s so hard to find details/specs on the different models. First I emailed Sanden and asked for a recommendation. I was glad to get response, which said essentially: the SD7B10 is probably too small, and he suggested a SD7H15, but said they have over 1,000 models and told me to call one of the distributors. So I called Vintage Air, who also were cool and answered my questions. Josh took the time to look up numbers and parts and suggested 04709-vma (5.5 CI w/V-belt) (this is actually 7 groove belt and won’t work, but the size seemed good). http://www.sanden.com/productlibrary...uide_Rev_2.pdf For Sanden, you can break down the model like this SD7B10: SD (wobble plate type)So then the SD7H15 is 150cc (9.3 Cubic Inches) Mike at “Classic Auto Air” confirmed what was recommended on this thread, but he said “stay away from 7176” because it would be too small. Yep, its the SD7B10 (that I already bought). Sigh. They can put the whole thing together, bracket, compressor, condenser, accumulator, lines, and fittings. Everything but a new drive belt, it seems. So that’s likely what I’m going to do. I also researched the Denso compressors and confirmed that the 10S20F is used on 2008 (my LS engine year, I think) suburbans with rear air. So, breaking this one down, it’s a 10 Piston, 200cc unit. But I think it uses the ’stock manifold’. Mike had some opinions on what compressor he would recommend (Sanden 514) I think… but that’s a bit small sounding (on paper) The Burb used an orifice tube in front (’76) and a Thermal Expansion Valve in the rear unit. See pics above for replacing the TXV. So, it looks like I'm not getting AC for the 4th of July break after all! |
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#47 |
Registered User
Join Date: Oct 2014
Location: Scottsdale, AZ
Posts: 465
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Re: Suburban A/C fix + Vintage Air?
I have a German unit called a Siroco. Its small and I have made quite a few modifications to it. Once I have it up and running I will post results and photos of it! Probably take most of the summer at the rate I'm finding time to work. Haha
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#48 | |
Registered User
Join Date: Oct 2014
Location: Scottsdale, AZ
Posts: 465
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Re: Suburban A/C fix + Vintage Air?
Quote:
By the way the Denso compressors can be replaced from the factory manifold to some regular O-Ring fittings. Check out coldhose.com or Vintage Air for those. |
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#49 |
Registered User
Join Date: Jun 2009
Location: san francisco, ca (east bay)
Posts: 674
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Re: Suburban A/C fix + Vintage Air?
It's hard to believe that TWO YEARS have gone by since I started this project, but we all know that can happen.
Seems that about every spring I start getting the AC itch. The good news is that I just put in my order for all the parts at "Original Air". I bought before I did my research and am going to sell some of the stuff I got originally. Live and learn. This time I called the guy from OA and he helped me piece together a kit. He suggested running all new hoses to the rear. Will the Covid thing, they are shipping slowly, but I should be getting something in a couple of weeks. I think the "install" part should go fast. And "getting it working" might be a different challenge! I'll need a crimper, and a way to figure out how to trigger the electric fans with the AC comes on. I'm running an MSD LS box... I wanted to thank everyone who posted here, it really helped me get my head around this project so far. I'm still an AC noob. That's about to change right quick though. |
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#50 | |
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Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,967
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Re: Suburban A/C fix + Vintage Air?
Quote:
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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