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Username Post: 1985 Silverado k30 w/454 eng a/c type?        (Topic#351534)
cw41 
Member
Posts: 26
cw41
Reg: 09-07-04
06-12-18 05:05 AM - Post#2736685    

I'm rebuilding the entire a/c system on my 85 silv K30 454 engine. Does it use the a-6 long or the r-4 radial compressor? I cannot find info other than it could come either way? I have all the compressor brackets for the A-6 and I see that a new style aluminum version is out, is it any good? the older style I had nothing but troubles with. I have R12 and 134a..
thanks for your time
chuck



 
gchemist 
Senior Chevytalk Moderator
Posts: 24385
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
06-16-18 01:37 PM - Post#2737186    
    In response to cw41

Can you fit a Sanden SD7HD? It’s a bolt on with brackets. I replaced an R4 with an SD7HD. R134 uses a cross flow condenser. R12 uses tubes that wrap around. Match the components.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


Edited by gchemist on 06-16-18 01:38 PM. Reason for edit: No reason given.

 
cw41 
Member
Posts: 26
cw41
Reg: 09-07-04
06-24-18 12:17 PM - Post#2738054    
    In response to gchemist

It has a Sanden U5746 single groove pulley that was retrofitted R-12 when I bought it. It just had a new condensor and dryer intalled also. But I have all brackets for the older A6 that I was going to use but I see that the R4 was a possibility also. I dont have any R4 brackets. the sanden cools nice around town but at freeway speeds it really drags the engine down (454) when it cycles and found the high side would climb in the 450lb range. Cycling switch set at 26. I have accesss to all the R12 or 134a I need. thanks for the help.



 
Mercedes 
Contributor
Posts: 106

Reg: 07-09-18
07-23-18 06:06 PM - Post#2740949    
    In response to cw41

I had an 85 Suburban 454 that had a long style AC compressor. It was not the A6 but some other design.

I believe that the prior poster is correct about the placement.



 
gchemist 
Senior Chevytalk Moderator
Posts: 24385
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
07-24-18 04:15 AM - Post#2740980    
    In response to Mercedes

My '95 Jimmy had an R4. I replaced it with an SD7HD. I used aftermarket brackets. The hoses were modified to fit SD7HD fittings. You can buy a compressor to fit stock R4 manifolds. I opted to use new fittings. Two fittings are more secure than a block style.

Attachment: SD7HD.jpg (139.66 KB) 1 View(s)


R4 compressor replacement. A SD7HD fits with new brackets. Works great!


'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


Edited by gchemist on 07-24-18 04:18 AM. Reason for edit: No reason given.

 
Mercedes 
Contributor
Posts: 106

Reg: 07-09-18
08-12-18 02:20 PM - Post#2742866    
    In response to gchemist

My local parts store actually gave me a new compressor for my suburban back in the day because it was a slow moving item. So, I installed it and it worked perfectly.

I checked on RockAuto.com and there is a long compressor for that vehicle that is not the A6. Mine worked well.



 
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