Refrigerant oil?

[493 Mike]

I am flushing and resealing the OEM A/C system on my 65 Coronet and am not having any luck finding a recommendation for what weight PAG oil to use in the old V-twin. Should I use the dip stick to check fill level as in the FSM?
I have found that I should back off the EPR valve adjustment screw 1/4 turn when converting to 134A as well as using 80% of the R-12 fill specs. And ignore the sight glass. Thanks.
Mike

 

[Darter6]

You are right Mike, I couldn't find anything pertaining to what what weight the oil is in the 1965 FSM.It's been awhile but the auto part store should show a Chrysler "spec" PAG oil. I did find that if you do not know the amount in the complete system, adjust the sump level oil to 2 inches using the dip stick method. 11 oz is the amount for a empty(clean) entire system. I didn't find the figure photo on making a "dipstick" in the 65 manual. My 72 FSM showed using stiff wire (coat hanger) and mark at 2 inches with it touching the bottom of the sump.45 oz is the refrigerant charge. You do the math for 80%.

 

[493 Mike]

You are right Mike, I couldn't find anything pertaining to what what weight the oil is in the 1965 FSM.It's been awhile but the auto part store should show a Chrysler "spec" PAG oil. I did find that if you do not know the amount in the complete system, adjust the sump level oil to 2 inches using the dip stick method. 11 oz is the amount for a empty(clean) entire system. I didn't find the figure photo on making a "dipstick" in the 65 manual. My 72 FSM showed using stiff wire (coat hanger) and mark at 2 inches with it touching the bottom of the sump.45 oz is the refrigerant charge. You do the math for 80%.

I built a dip stick to Chrysler specs in the early 70s when I was the A/C guy at the dealership I was working for. It just shouldn't be so hard to find this information on the internet! Thanks!
Mike

 

[Ranger16]

Someone correct me if I'm wrong, but didn't those old OEM R12 systems use Ester oil? I though they went to PAG with the R134a systems.

 

[oldbee]

Someone correct me if I'm wrong, but didn't those old OEM R12 systems use Ester oil? I though they went to PAG with the R134a systems.

That is true..

 

[5.7 hemi]

Don’t mix the 2 oils, they aren’t compatible. Best to flush the entire system then convert to the 134 Pag oil.

 

[493 Mike]

Don’t mix the 2 oils, they aren’t compatible. Best to flush the entire system then convert to the 134 Pag oil.

But, what weight oil?????????????
Mike

 

[Darter6]

Ranger you are right, It's been 4 years since the last time I messed with A/C. Mopar used ester.
Now how could I forget Ester, I had a crush on her in high school !

 

[5.7 hemi]

When you get the Sanden compressor, ask what PAG oil you should run.

 

[493 Mike]

When you get the Sanden compressor, ask what PAG oil you should run.

I am resealing the OEM compressor so that question will not be asked.
Mike

 

[Pistol Pete]

Ranger you are right, It's been 4 years since the last time I messed with A/C. Mopar used ester.
Now how could I forget Ester, I had a crush on her in high school !

 

[493 Mike]

If anyone cares I found a chart online that tells me to use PAG 100 in the Chrysler v-twin compressor with 134A refrigerant.
Mike

 

[5.7 hemi]

Sweet, I’m sure that’ll help others.

 

[Ranger16]

I checked my '69 service manual (more than once) and all I could find was that Chrysler uses a "wax free" compressor oil. They did not mention a viscosity.