How cold inlet air will good working ac give? - Toyota Nation Forum : Toyota Car and Truck Forums
Camry 3rd & 4th Gen (1992-1996 & 1997-2001)/1st Gen Solara (1999-2003) Toyota Camry Discussion for years 1992-1996 & 1997-2001, as well as Solara discussion for years 1999-2003. Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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post #1 of 27 Old 06-12-2019, 10:36 AM Thread Starter
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I serviced my ac today. There was 600grams r134 and full amount is 800grams. Reason to service was poor cooling.


Now its serviced but not so cool. Outside was 60f and ac max cold gived 44f on vents.


I think its warm car when outside temp rises near 85f.

Does anybody know how cold this age (1997 camry) with automatic ac gives (auto mode off, full cold)?

R12 and freezing times are in past but i wonder that arent enough.

Last edited by Karpov; 06-12-2019 at 11:08 AM.
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post #2 of 27 Old 06-12-2019, 12:57 PM
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I'll double-check when I get back to the shop as our ambient is 96-100 deg F today, but last time I measured 39 deg F at the center vents on my '00 5S-FE. I think ambient then was 80 deg F.
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post #3 of 27 Old 06-12-2019, 01:21 PM Thread Starter
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Thanks.

Ac compressor sounds fine and runs. Are there some common places to check? Dirty evaporator?


This is japan made and europe model. I dont know are usa ones colder ac:s? My chevy pickup has different orifice tube in hotter climate example.



Cabin filter is new also. Ac on cooling fan works only when compressor runs. When compressor "rests" during cycle fan rests too.


Many other cars fan runs all the time when ac button is "on".
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post #4 of 27 Old 06-12-2019, 04:23 PM
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Originally Posted by Karpov View Post
Many other cars fan runs all the time when ac button is "on".
I see, my '00 is US-spec, Japan-made. The fan runs corresponding to the fan speed dial, and the A/C cycles on and off. I think there's an ambient temp sensor at the bumper that prevents the compressor from turning on when the temperature outside is below some threshold. Also, US-spec gen4 Camrys have no cabin air filter.

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post #5 of 27 Old 06-12-2019, 04:29 PM
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Was it similar to before the service?

Yeah I think center vent is probably around 40 F. How’s the fan working? Try carefully spraying some water onto the condenser.
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post #6 of 27 Old 06-12-2019, 05:02 PM
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Outlet air temp depends on where measured. From what I've read outlet air loses about 5*F from just past evaporator to vent. I think 44F is a good temp as when ambient temp goes higher the system should compensate to provide same outlet temp.

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post #7 of 27 Old 06-12-2019, 09:30 PM
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Not the most accurate temp gauge, but:




...measured at both 95 deg F ambient and 84. Same result.

00 Camry 5S-FE 184k smoooth
01 ES300 147k NEEDS TRANS WORK
01 Insight 137k BROKEN CAMSHAFT
02 Insight 178k DC-DC BELLY-UP
08 STS-V 67k 570 RWHP!
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post #8 of 27 Old 06-12-2019, 11:02 PM Thread Starter
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Originally Posted by JohnGD View Post
Was it similar to before the service?

Yeah I think center vent is probably around 40 F. How’s the fan working? Try carefully spraying some water onto the condenser.
Leak and pressure test were fine. That was first recharge in +10years so system is not leaking.


It wasnt so cold and + 77f car didnt cool so well specially at city.
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Not the most accurate temp gauge, but:




...measured at both 95 deg F ambient and 84. Same result.
i have same kind of temp gauge
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post #9 of 27 Old 06-13-2019, 05:12 AM
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Originally Posted by Karpov View Post
There was 600grams r134 and full amount is 800grams. Reason to service was poor cooling.
How did you measure the 600g in the system and 800g fill?

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post #10 of 27 Old 06-13-2019, 05:19 AM Thread Starter
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Quote:
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There was 600grams r134 and full amount is 800grams. Reason to service was poor cooling.
How did you measure the 600g in the system and 800g fill?
in ac shoċ was automatic machine which printed paper. It said there was 600g r134 and now its 800g so 200g missing. 6ml oil and added 11ml.

So there was about 75% to full system
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post #11 of 27 Old 06-13-2019, 06:07 AM
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If you cool the evaporator down below freezing and use outside air the evaporator will soon become a large ice cube and you will lose any ac benefit. Ever have a ac that spit out a fog bank from the vents? Your evaporator will soon freeze up if your ac does that. On recirculate the ac will take the humidity out of the air inside the car. Once that is done and you are recooling the same air over and over, the temperature, at the vents will drop.

I always run my ac on recirculate, never ambient. When the car is moving the airflow over the ac condenser will make it work much better. Modern systems are designed to produce more flow at slightly higher temperatures.

My Echo seems to not cool properly, especially when you have left it in the sun and it's light blue. If it was black then it might be another story. Get it moving and that same ac gets cold enough to make my hands numb.

The old R12 systems would spit out air close to freezing temperatures, but they cost a lot more in energy to operate that way. Remember when the old York with huge pistons came on an you could hear it and feel the loss of power, even with a giant displacement engine. When efficiency became the primary consideration and no frozen evaporator became a part of the design parameters temperatures at the vents had to fall.

Also remember, no modern air conditioner is going to cool off a baked 160 degree interior very quickly. Either open the fresh air or thee windows and get rid of that temp surplus without relying on the ac alone. It gets hot enough here that I open both doors and let the car air out a little.

In my old school manual transmission Echo, I actually use forced decelerations to crank up the air conditioning and get "free" ac when the injectors shut off completely and the compressor is still running, even wit hthe engine using no fuel. In many cases where traffic congestion is significant and stop and go driving is the norm, using the ac when decelerating gives me most of my ac. without a fuel mileage penalty.
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post #12 of 27 Old 06-13-2019, 06:16 AM
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What are the system low and high side pressures? Hard to make much of a diagnosis without knowing. At idle low should be around 28-30 psi and high should be around 180-200 psi.
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post #13 of 27 Old 06-13-2019, 06:17 AM Thread Starter
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I try understand all your points 🙂


Normal summer temp here is 65-70f and 85f is about 5-30 days in year.

We dont usually have problems with ac, no fogs etc and they work even outside air (recirc off).



So ac is not working that hard there and no big rushes in traffic. But i dont still wanna sweat inside my car 🙂


In two days we have 65f (now less) i must check vent temp then again, but im scared that its not enought.
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post #14 of 27 Old 06-13-2019, 06:19 AM Thread Starter
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Originally Posted by chuckoff View Post
What are the system low and high side pressures? Hard to make much of a diagnosis without knowing. At idle low should be around 28-30 psi and high should be around 180-200 psi.
i dont have gauges for that. Shop machine did automatic one hour process with 20min vacuum test, pressure test and refill. All those passed.
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post #15 of 27 Old 06-13-2019, 06:42 AM
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Originally Posted by Karpov View Post
in ac shoċ was automatic machine which printed paper. It said there was 600g r134 and now its 800g so 200g missing. 6ml oil and added 11ml.
I'm not familiar with shop automatic machine. I assume it pulled out old 134a and weighted it? How did it measure the amount of oil? Too much oil can reduce efficiency.

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