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Old 05-08-2018, 09:13 PM   #76
Airdirect
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning

Making progress, the truck is back in the garage and ready to finish the painting of the cab!
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Old 05-11-2018, 11:06 PM   #77
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

Making progress on the body work on the cab. Roof is sanded, hope to get the cowl area and door hinges sanded tomorrow. Next I will tackle the door opening and rear of the cab. If all goes as planned, I should be able to paint it next week.
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Old 05-11-2018, 11:08 PM   #78
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

I am looking for a fan and fan clutch that will fit the 4-53T. Mine has a solid fan drive with no clutch.

Thanks

David
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Old 05-12-2018, 10:07 PM   #79
Robert1970C20rstbukt
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning

Don't believe there ever was a fan clutch for that engine, factory book only lists a direct drive even for a truck with factory A/C.
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1984 Chevrolet C30 welding truck 454/SM465
1977 GMC C15 pickup 350/TH350
1970 Chevrolet C20 pickup 307/TH400
1970 Chevrolet K20 Suburban 454/TH350
1969 GMC 8500 fire truck 478M V6/5 spd 1200 gallon pumper
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Old 05-12-2018, 10:59 PM   #80
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

If you look close at this truck, you will note it has a fan clutch. I have seen one other unit (California Truck) that also had a fan clutch. It may be that one was not offered in 1979.

David



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Old 05-13-2018, 04:34 PM   #81
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

Here is a picture of a 1979 GMC 7000 with 4-53T equipped with A/C and fan clutch. This picture was on www.4btswaps.com "foxyboxy" forum.
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Last edited by Airdirect; 05-13-2018 at 07:35 PM. Reason: Picture link was broken
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Old 05-14-2018, 10:44 AM   #82
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning

These look to be the relevant pages for fan clutch stuff:

http://gmpartswiki.com/getpage?pageid=176194
http://gmpartswiki.com/getpage?pageid=176193
http://gmpartswiki.com/getpage?pageid=176192
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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

My Introduction with my '83s History
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Old 05-14-2018, 07:11 PM   #83
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning

I didn't think about the GM Wiki page, forgot there are some medium catalogs listed there. Looks like the first design used the same clutch for the 350 and 366, Hayden # is 2801. It has a four bolt pattern on the pulley and fan, looks real similar to the one in the picture.
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1984 Chevrolet C30 welding truck 454/SM465
1977 GMC C15 pickup 350/TH350
1970 Chevrolet C20 pickup 307/TH400
1970 Chevrolet K20 Suburban 454/TH350
1969 GMC 8500 fire truck 478M V6/5 spd 1200 gallon pumper
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Old 05-14-2018, 09:35 PM   #84
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

Thanks Robert! Great help, the first design used on the 350 should be fairly common and easier to find. This gives me a good start.

David
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Old 05-15-2018, 04:41 PM   #85
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning

You're welcome, credit goes to Devin for finding the parts pages. I'll have to bookmark that catalog. That clutch is also similar to one for a 454, # 2797. You might check the specs on them and see what the mounting dimensions are for the pulley and fan.
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1984 Chevrolet C30 welding truck 454/SM465
1977 GMC C15 pickup 350/TH350
1970 Chevrolet C20 pickup 307/TH400
1970 Chevrolet K20 Suburban 454/TH350
1969 GMC 8500 fire truck 478M V6/5 spd 1200 gallon pumper

Last edited by Robert1970C20rstbukt; 05-15-2018 at 07:55 PM.
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Old 05-16-2018, 12:54 PM   #86
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

Here are pictures of progress. Got the cowl, roof, door openings, and rocker panels sanded, rear of cab to go then prime and paint.
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Old 05-18-2018, 11:21 PM   #87
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

Removed a hail dent from the roof. Installed new left and right doors. Took some adjusting to get them to line up correctly. The original doors fit terrible, I was in hopes the aftermarket doors might align better. In the 1979 era, fit and finish were not anything like today's standards. After some twisting bending and lots of adjusting I got them to fit slightly better than the original OEM doors. Time will tell how they hold up.
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Old 05-21-2018, 11:51 PM   #88
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

Made a little progress, transferred mirror mounting holes from old doors to the new. I used masking tape to make a template and then moved the template to the new door. I use multiple layers so it does not stretch when removed and reinstalled. Once the holes were all drilled (used a step drill bit to get a nice smooth hole with no stress risers) I then primed the holes.
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Old 05-25-2018, 12:12 AM   #89
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

More progress:
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Old 05-25-2018, 12:18 AM   #90
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

More progress, I had good help, my sons Noah and Micah were great! Also pictured is my bride (Angie) and yours truly.
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Old 05-25-2018, 12:21 AM   #91
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

More progress:
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Old 05-29-2018, 01:41 AM   #92
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

Started putting the cab back together, cowl area is complete, driver side mirror mounts have been installed, once I get the passenger side done I will be working on the cab clearance lights.
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Old 06-01-2018, 08:39 PM   #93
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

Got the cab finished! Glad to have this portion of the rebuild done! Purchased a temporary 30 day tag so I could take it to town to have Air Conditioning lines made. When I started to pump the system down I remembered it was configured for R-12. Another trip to the parts store to get the R134A adapters.
I pumped AC system down, serviced with oil charge, then started adding the first can of Freon R-134A. Much to my dismay, I discovered I had fabricated lines that hooked the low pressure side to the discharge of the compressor and the high pressure side was connected to the suction. Some days you just cannot get it right! Hopefully I can figure out a easy fix as I am using the original GM style connectors on the compressor.
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Old 06-03-2018, 11:04 PM   #94
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

The fun details, made a conformity sticker to replace the original. I had taken a good picture of it before removal. The sticker was originally printed on a paper label with a clear film over the top. Was able to get sticky project paper at Office Max and clear printable shipping label. I then recreated the sticker using Microsoft Paint, printed it and then cut the clear to fit with the required overlap. It turned out really good. The first picture is the original and the bottom picture is my re-creation.
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Old 06-07-2018, 01:14 AM   #95
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

More progress. Got the Air Conditioning finished up. Made new hoses that connected the compressor output to the high side and the suction to the low side. Serviced with oil charge, and 4 cans of 134A. Presto, we have cold cold air blowing out the dash vents. Moving the temp control allows us to blend the temp as advertised. Next we installed the rain gutters over the left and right doors.
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Old 06-07-2018, 08:07 PM   #96
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning

Making some good progress! Were you able to get a fan clutch for the 4-53? I'm running R12 in my welding truck and pickup, got a decent deal on two cases a couple years ago. I installed one electric fan on my '84 to help with all the heat the 454 makes, it can get down to freezing with no trouble idling.
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1984 Chevrolet C30 welding truck 454/SM465
1977 GMC C15 pickup 350/TH350
1970 Chevrolet C20 pickup 307/TH400
1970 Chevrolet K20 Suburban 454/TH350
1969 GMC 8500 fire truck 478M V6/5 spd 1200 gallon pumper
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Old 06-07-2018, 11:29 PM   #97
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

I have not purchased a fan clutch and fan. I am still looking for one.
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Old 06-11-2018, 09:15 PM   #98
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning

Found this on ebay, correct for a medium duty with a 350. That bolt circle would fit on the 2797 fan clutch. Seems like the catalog might have been wrong, as a 2801 clutch is for a 366 and 427 that takes a larger fan. I'm betting this fan and the 2797 will fit your truck if the mounting dimensions are right.

https://www.ebay.com/itm/CHEVROLET-C...YAAOSwH-daKvZX

https://www.rockauto.com/en/moreinfo...793626&jsn=573
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1984 Chevrolet C30 welding truck 454/SM465
1977 GMC C15 pickup 350/TH350
1970 Chevrolet C20 pickup 307/TH400
1970 Chevrolet K20 Suburban 454/TH350
1969 GMC 8500 fire truck 478M V6/5 spd 1200 gallon pumper
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Old 06-13-2018, 08:12 AM   #99
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1979 Chevrolet C70 Conversion to OEM Air Conditioning

Thanks Robert, I really appreciate your help!
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Old 06-13-2018, 08:27 AM   #100
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Re: 1979 Chevrolet C70 Conversion to OEM Air Conditioning

Robert,

My current fan has a 22" diameter. It also has seven blades.

David
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