Quick ac charge question, a bit time sensitve
Thread Starter
Le Mans Master
Joined: Oct 2003
Posts: 6,126
Likes: 19
From: Streamwood illinois
Quick ac charge question, a bit time sensitve
I replaced a leaky compressor, expansion valve and drier. I then vacuumed it down to 320 microns. It held a vacuum. I have 9.5oz of oil in as designed. So I fed in the first 280g of refrigerant as a liquid and it went fine. I then started the car and compressor ran, great. As i started to feed in refrigerant as a gas i got about 100g a a gas but I've got to a point where it will NOT take any more (well .1g/sec right now so pretty much non existent suction). Pressures are 24/175 with a center temp 44.5 deg. It's only 70deg in my garage. I'm using 12oz cans and I've got it on a scale so I can't easily warm the can and still measure what i'm putting in.
Right this second I'm heating the can in a bucket of hot water, drying and putting it back on the scale and i'll see how that does.
It takes a total of 680g (24 oz) and I'm a bit above half way. Any suggestions?
Thanks
Dave
Right this second I'm heating the can in a bucket of hot water, drying and putting it back on the scale and i'll see how that does.
It takes a total of 680g (24 oz) and I'm a bit above half way. Any suggestions?
Thanks
Dave
Last edited by T_Vert; Jan 14, 2019 at 12:21 PM.
Burning Brakes
Joined: Jan 2006
Posts: 788
Likes: 105
From: Olathe Kansas
That seems to me to be too much oil for a compressor replacement job...
Also, You won't get the MAX amount of freon in it at 70* ambient temps.. You'll need to see closer to 80*..
But, it could also be that you have too much oil.
If you are getting vent temps of 44* .. Leave IT... Recheck when it warms up...
Also, You won't get the MAX amount of freon in it at 70* ambient temps.. You'll need to see closer to 80*..
But, it could also be that you have too much oil.
If you are getting vent temps of 44* .. Leave IT... Recheck when it warms up...
Thread Starter
Le Mans Master
Joined: Oct 2003
Posts: 6,126
Likes: 19
From: Streamwood illinois
That seems to me to be too much oil for a compressor replacement job...
Also, You won't get the MAX amount of freon in it at 70* ambient temps.. You'll need to see closer to 80*..
But, it could also be that you have too much oil.
If you are getting vent temps of 44* .. Leave IT... Recheck when it warms up...
Also, You won't get the MAX amount of freon in it at 70* ambient temps.. You'll need to see closer to 80*..
But, it could also be that you have too much oil.
If you are getting vent temps of 44* .. Leave IT... Recheck when it warms up...
Little update. The hot water helped. I think the issues were complicated by the little 12oz cans. As they got empty they just were slow to introduce refrigerant. I ended up using 3 cans and probably wasting a good few oz. of it but I didn't want to wait forever. Center vent is now at 35.1F @1500 RPMS so I'll take that. Pressures seem good. Before I revved it it was at 25/150 @70deg and 20%RH but after I revved it I noticed the high side go down to 110psi. I'm assuming the compressor cycles on/off based on need? The clutch was spinning so perhaps the orifice valve is controlling that?
Dave
Last edited by T_Vert; Jan 14, 2019 at 12:58 PM.
Melting Slicks
Joined: Nov 2013
Posts: 2,048
Likes: 315
From: USA
I did pretty much exact same refilling procedure as you, with the hot water and scale etc.... I found the pressures to be all over the place and the service manual numbers to be difficult to actually compare to. I just did it based on weight and it's been great for a few years now.
Thread Starter
Le Mans Master
Joined: Oct 2003
Posts: 6,126
Likes: 19
From: Streamwood illinois
Thanks guys. If anyone w/ more knowledge could help me understand why the pressure would drop to 110 on the high side w/ compressor still running and ac vent STILL at 37deg? I assume it is moderating pressure somewhere based on demand I just want to understand bit more as to how.
Dave
Dave
