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Wow really hard to find info on internet about these cars. I am looking for Refrigerant amount for a complete recharge on a 451. Someone posted 458G or 1.4 lbs. for the 450 but I found different #'s on another site?? I also found the capacity for a/c oil, which is listed as PAG/ PAO68, as being 420 g or 14.815 oz.'s. This info was from BEHR Hella service chart. They also listed the 451 refrigerant capacity as 0 = unknown. They did have the refrigerant capacities for the 450 as being 180 ml's & the 454 roadster as 100 ml's. Far different from the first #'s I found? Anyone have an answer for the 451 refrigerant amount?
 

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The 451 system holds 420g of refrigerant.. not oil. I don't think you want to fill it with oil completely. Unless you replaced a component, or blew a line, I wouldn't worry about the oil. If you are adding R134A, you can put too much in and make things worse. Might be better off to take it in and have it filled.
 

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Dogboy, what’s your exact model 451?

451.3 takes 430g
451.390/490 with code V03 takes 500g
451.390/490 without code V03 takes 470g
451.391/491 takes 550g

Jimv57 is correct - adding too much coolant will quickly kill your compressor and, in many cases, metal particles will get into the evaporator and condenser and can’t easily be flushed, necessitating replacement of all the parts in the system. I just went through this with my daughter’s Pontiac Vibe.

The system should be completely evacuated under vacuum and kept under hard vacuum for at least an hour. More if it’s been opened and there is moisture in the system. Adding the correct about is critical.
 

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Discussion Starter #4
Dogboy, what’s your exact model 451?

451.3 takes 430g
451.390/490 with code V03 takes 500g
451.390/490 without code V03 takes 470g
451.391/491 takes 550g

Jimv57 is correct - adding too much coolant will quickly kill your compressor and, in many cases, metal particles will get into the evaporator and condenser and can’t easily be flushed, necessitating replacement of all the parts in the system. I just went through this with my daughter’s Pontiac Vibe.

The system should be completely evacuated under vacuum and kept under hard vacuum for at least an hour. More if it’s been opened and there is moisture in the system. Adding the correct about is critical.
Not sure on how to find out which 451 it is but from the BEHRHELLA service printout they have the 451 as needing 420 G of refrigerant. The only #'s I find that reference a 451 are on the bottom of the black sticker on engine lid: A 451 817 42 20 . Also says 0.93 +0.02 lbs R134A
0.42,+0.01 Kg
Lubricant A 001 989 08 03
I believe PAG ISO 46 can be used for compressor. Just want to find if 180Ml of oil is correct amout for prefilling compressor before putting back into car. Or should I leave it empty & have the A/c guy add it when charging with R 134A.
 

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I believe there is a sticker under the front hood with capacity on it, or it is in the back. (suffering with CRS syndrome)
 
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