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LMC Truck



Username Post: R4 compressor replacement SD7HD        (Topic#346609)
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
08-15-17 07:58 AM - Post#2704309    

We've seen plenty of them. The '95 Jimmy R4 compressor locked up yesterday. It was 100 degrees. It lasted two months since it's last charge due to a leaking valve stem. A burning smell was a brand new belt. Stopped it in time to save the belt.

So now, it's upgrade time! Sanden 508 style. Vintage Air in San Antonio did not have a rear housing to use stock hoses. A local compressor rebuilder says they can help make the conversion. Unfortunately, I'll have to wait until time off on Thur. Stay posted for pictures. The shop also has bolt on brackets to make the conversion.

A conversion pic can be found on Vintage Air's web site. Go here: http://www.vintageair.com/2017%20Catalog/2017%2 0Vi...
It's the bottom left corner.

Records indicate the factory compressor failed at 64,411 miles. The current locked up lasted 49,116 miles. A new SD will be nice. They are rated to 6000 RPMs!!

This conversion is a test for my C10, BADBOW. My avatar pic will be updated when it's converted.

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


Edited by gchemist on 09-02-17 06:20 AM. Reason for edit: No reason given.

 
LMC Trucks
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
08-16-17 03:55 AM - Post#2704423    
    In response to gchemist

After more research and Sanden 508 parts not locally available, Sanden SD7H15HD-FLX is a better option. It has 7 pistons instead of 5. Bigger and should still fit. I'll post info as I piece a new A/C system for my '95 Jimmy.

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


 
toro455 
"3rd Year" Silver Supporting Member
Posts: 374
toro455
Loc: Western NY
Reg: 06-15-02
08-19-17 07:13 PM - Post#2704851    
    In response to gchemist

I was looking for an R4 for my 1983 Olds Delta 88 and I saw somebody is making a scroll compressor which looks essentially identical to the radial piston R4. I was told the drawback with a scroll is if the pulley ratio is the same as the original R4 it might not be ideal at low rpm as far as system performance; the scroll should normally spin a little faster. I still may get the scroll option R4 look-alike though because the R4s in my mind are a little hit and miss. The newest ones were designed for R134a so they should be fine but we never know what is getting rebuilt.



 
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
08-20-17 05:17 AM - Post#2704894    
    In response to toro455

Here's the upgrade! Want to change your mind?

I need some help with wiring. Power is available at low pressure switch and new inline pressure switch. The R4 high pressure was moved into the out coming SD7 line. The normal green R4 wire does not have power. Without power, the compressor will not engage. The R4 power wire is connected to the SD7 single power wire. The SD7 is self grounding. I didn't have my Power Probe IV to do further testing. I assume the new high pressure switch is not passing power to the compressor wire. Either the wiring crimp is bad or the switch is not all the way on. I'll have to look for a wiring diagram. I assume power goes from low to high to compressor.

I did find this info at www.thirdgen.org.
"It's not a resistor, but a diode. Not needed on the Sanden ( it's built in I think). You may have a High Pressure switch on the back of the R4. The power runs from the Accumulator low pressure switch, thought the green wire to the R4, then out the black wire either to ground or to the High Pressure switch ( which interrupts the ground when 450PSI is exceeded). On the Sanden, you go Green to sanden. Can't remember if the Sanden has a seperate ground wire, or if it just grounds through the bolts.

You may have a third set of wires to the High Pressure switch in the High Side Pressure Line. Just leave these alone- they trigger the fan ( at least that's what I use it for)."
https://www.thirdgen.org/forums/cooling/665537 -r4-...


Attachment: SD7HD.jpg (103.92 KB) 17 View(s)




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


Edited by gchemist on 08-20-17 07:14 AM. Reason for edit: No reason given.

 
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
08-30-17 08:12 AM - Post#2706138    
    In response to gchemist

Quick update. The new SD7HD compressor is on and working. I'll post pictures later this week. We ended up replacing the evaporator too. Only the condenser is left stock. Everything else is new. After an electrical problem was fixed, it's time to properly check pressures to top it off properly.

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


 
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
09-02-17 06:29 AM - Post#2706482    
    In response to gchemist



Attachment: IMG_7022.JPG (117.87 KB) 13 View(s)


SD7HD compressor


Attachment: IMG_7020.JPG (114.1 KB) 12 View(s)


New evaporator, custom hoses, new drier, new low higher pressure line, and new orfice tube.


Attachment: IMG_7021.JPG (146.77 KB) 11 View(s)


Complete view


Attachment: IMG_7021.JPG (146.77 KB) 12 View(s)


Complete view


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


 
SleeperSS 
Senior Member
Posts: 2537
SleeperSS
Loc: Spanaway, Wa
Reg: 10-17-04
09-02-17 01:58 PM - Post#2706514    
    In response to gchemist

Two things..polish the drier...polish the beltensioner....otherwise...Bravo Zulu.

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
09-03-17 03:14 AM - Post#2706544    
    In response to SleeperSS

Polish? What do you use? Sandpaper? How do you cover it?

I've noticed the engine power drain when its on is less than the old R4. It blows nice and cold. I need to buy a thermometer to check vent temps. Operating sound is different. It sounds like the rings are seating in. Maybe it's normal. It does have 7 small pistons to move R134. No oil was added to the system. The SD7HD comes filled with proper oil.

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


 
SleeperSS 
Senior Member
Posts: 2537
SleeperSS
Loc: Spanaway, Wa
Reg: 10-17-04
09-03-17 05:43 AM - Post#2706549    
    In response to gchemist

Here's my 5 minute polish job on my drier...

http://www.s10forum.com/forum/f74/5-minute-po lish-...

You're not going to want to hear this...Sanden doesn't put the correct amount of oil in the compressor. The install sheet gives the correct procedure for adding oil. Basically it involves draining the oil that's in it, measuring it, then refilling it to to level required for your system. The same compressor fits multiple vehicles and requires different amount of oil. Sanden also requires a specific oil. When I installed mine, the only place I could find it at the time was the Dodge dealer...$40 for a tiny can. Bottom line is...you may not have enough oil in it causing then noise.

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
09-03-17 06:07 AM - Post#2706552    
    In response to SleeperSS

The local shop told me not to add any oil. So I trust them. They have to provide a warranty on it. I bought all the parts except the evaporator from them. I'm supposed to take it by so they can see the install. Even the install instructions came with a big note not to add oil. I'll clarify it with them ASAP.

I wonder if Mother's wheel polish will work?

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


 
SleeperSS 
Senior Member
Posts: 2537
SleeperSS
Loc: Spanaway, Wa
Reg: 10-17-04
09-03-17 06:23 AM - Post#2706555    
    In response to gchemist

Any metal polish will work. Of course it was easier before install.

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
SleeperSS 
Senior Member
Posts: 2537
SleeperSS
Loc: Spanaway, Wa
Reg: 10-17-04
09-03-17 06:24 AM - Post#2706556    
    In response to gchemist

Any metal polish will work. Of course it was easier before install.

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
09-03-17 07:29 AM - Post#2706563    
    In response to SleeperSS

Yup, wish I knew about before installing the parts. I'll be sure polish parts on BADBOW when it gets converted to an SD7HD.

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


 
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