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All New System Help

KJAM on Sat April 27, 2013 5:17 PM User is offline

Year: 1993
Make: Pontiac
Model: Grand Am SE
Engine Size: 3.3 V6
Refrigerant Type: 134-A


I have a 93 grand am . doing a complete install , all new parts
condenser ac delco from a 94 model grand am which is serpentine type, [94 was 134a]
denso v5 compressor [ according to denso its a 134a in a v5 body]
134a expansion valve by four seasons
134a drier by ac delco 94 model
evaporator core by ac delco 93 model [ was told this can be original part as it has to fit the case]
new lines all 134a from ac delco

now i was told from my chevy dealer ac guy , to put 2 oz in compressor 2 oz in condenser 2 oz in evaporator core 2 oz in drier total 8oz

i read all over the place ,,, ALL different THINGS,,,, i have the gm service manuals for my car , but its for r-12 ok
on the compressor it says ,,, if less than 1 oz removed then add 2 oz oil in it ,,, ok , but this is a new unit that did not come with oil in it
there is a big sticker on it stating to add oil b/c this was shipped without oil,,,,, delema "-)

i just need to know is how much oil ?
how much in each unit?
what type ? 46 or 150 pag [ all gm uses 150 , is this true?]
how much 134a to use [ sticker on car for r-12 says 2.68 lbs ]

and with all the parts that i bought , would this be an official 134a system ? not just a retrofit jobby .....

any help

thanks !!!! :-)

mk378 on Sat April 27, 2013 7:13 PM User is offline

V5 compressor has an oil sump. Take the oil plug out of the side, make sure that it is empty, then pour all 8 oz of your new oil in there.

The compressor is the only part that actually needs oil...

I think you can treat it as a 1994 system since most of your parts are from that year.

On a newly assembled complete system I suggest you charge a couple oz of refrigerant, up to 50 psi, then wait a day or so to make sure it holds pressure. Do not run the compressor until you have as close to a full charge you can get without starting the compressor.

GM Tech on Sat April 27, 2013 9:06 PM User is offline

Just a note:

All threaded connectionsl went to metric in '94 - perhaps you changed all hoses- otherwise they would not have threaded onto things like a/d condenser etc..metric connections have a line engraved in the nut - that's how they are identified.

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

KJAM on Sat April 27, 2013 10:25 PM User is offline

Thanks for the help....
thanks for the metric help also will look into that , i have all the parts in boxes now will have to un box and make sure all will bolt up to each other

any other ideas help etc is more than welcome ,,,

my a/c exp goes back to the early 80`s when it was all r-12
this 134a is kicking my butt hahaha

again thanks !!!!!

iceman2555 on Sun April 28, 2013 11:03 AM User is offlineView users profile

Denso spec's PAG 46 for their compressors. Do not see a change for this set up. Also insure that the lubricant is added to the 'drain' port in the case of the compressor. Failure to do this will result in compressor failure. It is possible to add all 8 oz to the compressor body.....or add 3-4 to compressor and the remainder to the new accumulator. This will work also.
Insure that the system is properly charged. The use of cans and pressures is not an acceptable method to recharge this system...use the correct equipment. The 94 list 36 oz 134a. 93 charge of r12 is 42 oz. Suggestion would be to go with the 93 charge. Once the system is charged...perform a temperature test of the evap inlet and outlet. Max cool/high blower/doors open/engine at idle. Let the system operate app 5 minutes and then measure these temps...they should be equal or within 5 degrees of each other. If the inlet is warmer....over 6 - 8 degrees...reduce the amount of refrigerant slightly.
Good luck

The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

KJAM on Mon April 29, 2013 9:41 AM User is offline

Thanks !!!
main thing is the pag oil, what type and how much I need and which unit gets what,,,,
then I will pull down to 30lbs to see if it holds a vacum
then I will take it to the dealer I trust and have them put it on the machine to do the rest....
I think that would be the way to go ,,,

What you think ???

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