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Am I fully charged?

70monte on Sat June 12, 2010 1:51 PM User is offline

Year: 1998
Make: Chevrolet
Model: K3500
Engine Size: 7.4L
Refrigerant Type: R134a
Ambient Temp: 86 F
Pressure Low: 31
Pressure High: 225
Country of Origin: United States

Hi, I was wondering if I'm close to being fully charged? I'm using 12 oz cans with a side tap and its been hard to get a good weight with the line attached. Truck takes 2lbs of freon. I'm getting 46* F temps at idle and 39* F at 1500 rpms. Thanks.

Wayne

TRB on Sat June 12, 2010 2:13 PM User is offlineView users profile

Are the inlet and outlet tubes the same temp?

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daman on Sat June 12, 2010 2:17 PM User is offlineView users profile

Looks close yes.

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'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

70monte on Sat June 12, 2010 2:45 PM User is offline

Quote
Originally posted by: TRB
Are the inlet and outlet tubes the same temp?

The inlet side going to the condensor was hot and the outlet side coming out of the condensor where the OT is located was cold. Line on suction side of the compressor was cold and discharge side was hot. The accumulator was cold as well as the top line from the accumulator going to the evaporater.

Pretty much everything in the system was replaced except for the evaporater and the line going from the outlet line of the condensor to the evaporator. The compressor is a new Seltec/Valeo from this site, the condensor is a new one from this site, Accumulator, OT, o-rings, and line set that comes out of the compressor are all new. Low pressure switch on back of compressor is new. I used blue Nylog on all O-rings and connections except at the compressor. Thanks.

Wayne

daman on Sat June 12, 2010 2:52 PM User is offlineView users profile

He was talking lins in and out of the evaporater.

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

70monte on Sat June 12, 2010 2:54 PM User is offline

Ok, thanks. Yes, they were both the same temps. They were both cold.

Wayne

daman on Sat June 12, 2010 2:56 PM User is offlineView users profile

Your good then

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

70monte on Sat June 12, 2010 3:25 PM User is offline

Ok, thanks.

Wayne

Doug40 on Fri July 02, 2010 5:39 PM User is offline

I hope it's OK to hook onto this thread as I was trying to access the charge using the evap inlet/outlet temps as suggested above.

My car is a 2001 Aztek that had the condenser replaced in 2005 when I got the car. I have done nothing in the 5 years since I got the car. The AC was always good and it is still cold enough for us to operate in Phoenix this time of year. One thing though, we usually run the blower at the lowest speed or a notch above that and always recirculate the inside air. When the car is cooled down, the outlet air feels cold. I haven't measured the outlet temp.

Yesterday, I tried to check the inlet and outlet temps at the evaporator with the blower running on high, and the doors open. The engine was hot and the ambient temp was 108 or above.
I could get my hand very close to the evaporator input. The temp of the suction line was warmish and the temp of the liquid line was uncomfortably warm on my thick-skinned fingers. The body sheet metal above was so hot it caused a burn on my forearm a couple inches above the wrist.

It is not possible for me to remove and weigh the charge.
Should I add a few ounces and try to assess the temps again (assuming that test still applies in ambient temps like ours)?
or, should I measure the pressures and add some freon to reach a certain suction pressure?
or, just add a half-can for good measure?
or, other?

Thanks for any suggestions,
Doug

mk378 on Fri July 02, 2010 6:04 PM User is offline

Your Aztek has a TXV system. The test described above does not apply. What are the vent temps like in the full stress test? Generally the rule is as long as you're getting cold air, don't mess with it.

Doug40 on Fri July 02, 2010 6:23 PM User is offline

The AC seems to work as well as any I have had working in the PHX summer environment. Once the temp gets down to a reasonable level it is more than adequate. We usually find that when we operate it on recirculate at the lowest blower setting and it finally stabilizes, the inside temp becomes too low and we shut it off 'till it is needed again. In the current Phoenix temps, that might not apply, but we will find out if it works as in the past when we get out of the valley in a few weeks.

I like you suggestion of leaving it alone.

Thanks,
Doug

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