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AC not cool enough

kapilamuni on Wed August 03, 2011 8:56 AM User is offline

Year: 1998
Make: TOYOTA
Model: TERCEL
Engine Size: 1500cc
Refrigerant Type: R134a
Ambient Temp: 30 c
Pressure Low: 20 psi
Pressure High: 130psi
Country of Origin: Sri Lanka

Hi,
My car ac is not cool enough & during mid day (around 32c) no cooling at all.
Following observed with gauges attached (R12 gauges converted to R134)

idle - 35/125

1500rpm - 20/130

2000rpm - 10/130

pls advice what's wrong.

thanks & regds

kapila

mk378 on Wed August 03, 2011 9:28 AM User is offline

High side is too low. The first thing I'd consider is undercharged / leaked out.

kapilamuni on Mon August 08, 2011 10:21 AM User is offline

Hi,

Thanks. got it topped up by a AC shop.
Now the cooling is enough but when it's really hot (mid day @ 32c) cooling is not enough.

regds

JJM on Mon August 08, 2011 10:09 PM User is offline

How was the system "topped up"? What procedure was used and much refrigerant was recovered?

Joe

When considering your next auto A/C purchase, please consider the site that supports you: www.ACKits.com


kapilamuni on Wed August 10, 2011 6:51 AM User is offline

They connected the gas tank to the low side through a gauge set and
while engine running checked the low line for dew forming by hand.
Here in SRILANKA nobody uses ac recovery units or weigh the amount of
R134A going into the system.

Also they measured the temp at the centre cowl and it was reading 16 c., when the compressor cut out.

regds

kapila

JJM on Wed August 10, 2011 7:34 PM User is offline

That's what I figured. Charging procedure is not correct, and it shows. The system is undercharged.

Unless there's a difference with non US spec vehicles, the system takes exactly 1 pound of R-134a. Vacuum the system down and simply add one 16oz can of R-134a to the system (after making certain the hoses are charged in advance). Even without fancy equipment, you can still put the tank on a scale and weigh in.

If the system has a leak, oil was probably lost in the process. Was any oil added back?

Joe

When considering your next auto A/C purchase, please consider the site that supports you: www.ACKits.com


kapilamuni on Sun August 14, 2011 2:09 AM User is offline

Hi,

No oil was added.
here we dont have smaller cans of 134 .it's 30lb thing.
Trid online,but Nobody s wlling to ship due to retrictions.

regds

kapila

JJM on Sun August 14, 2011 10:10 PM User is offline

If you have a scale - doesn't have to be a professional refrigerant scale - just as long as it goes up to 50 pounds and reads in ounces, all you have to do is put the tank on the scale, hoses and all, purge the center yellow line, record the weight, and just open the wheel on your gauge set until it drops 1 pound, or 16 oz. For example, if everything hooked up weighs out at 34.6 pounds, slowly add refrigerant until the weight is 33.6 pounds.

Joe

When considering your next auto A/C purchase, please consider the site that supports you: www.ACKits.com


kapilamuni on Tue August 16, 2011 12:22 PM User is offline

Hi,
THANKS.
Buying that 30lb can is costly. It's around 300USD, here.
Anybody on this forum willing to sell smaller R134 cans( 12-16oz)?

regds

kapila

JJM on Tue August 16, 2011 11:56 PM User is offline

It's kind of odd that given nobody recovers refrigerant, it would be so difficult to obtain cans of R-134a. Has R-134a been banned in Sri Lanka or something?

Joe

When considering your next auto A/C purchase, please consider the site that supports you: www.ACKits.com


alfred123 on Wed August 17, 2011 12:46 AM User is offline

You need to repair your AC. This is very important otherwise you will get high amount of bill. Ask some expert for such needs. Try this link it might be helpful to you.
Coral Gables Air Conditioning RepairText

kapilamuni on Fri August 19, 2011 11:52 AM User is offline

Hi,

R134a avlble freely but in 30lb cans. it's expensive for DIY type.
the smaller cans are not avlble here.

regds

Angelaaa81 on Wed August 24, 2011 1:16 PM User is offline

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kapilamuni on Sat October 15, 2011 3:37 AM User is offline

Hi Guys,

Problem again. No cooling when atmphre above 30c
Checked the system, it gives the following;

Otside temp 32 c
AC off -- Low 60psi High -- 120 psi
AC on -- 60 psi 150 psi,

went to ac shop,. Tech says low on gas and tries to add thro low side. Immediately low side climbs to 100 & continues. He shuts of the sysytem & say blocked evap.

I doubt that . Can some body advice please.

regds

kapila

NickD on Sat October 15, 2011 7:15 AM User is offline

R-134a is around 300 bucks for a 30# cylinder here as well, if you want AC, have to pay for it. Was around 80 bucks a couple of years ago, and they claim there is no inflation, the lying bastards. Everything is skyrocketing. But at least with a cylinder, you get a valve and take out only what you need, no need to purge each time with a can. Then what do you do with a can that is half full? Just pitch it, it will leak out anyway, for that reason, cans are illegal in my state.

Otside temp 32 c
AC off -- Low 60psi High -- 120 psi
AC on -- 60 psi 150 psi,

You are measuring static pressure with the AC off, should take no more than a minute for the low and hi side ports to equalized. A sure sign of blockage, my guess is the TXV valve is shot, its a variable orifice controlled by a capillary tube or the filter mess is plugged solid. Either case it has to be removed and replaced, plus the rest of the system needs to be flushed out or it will plug up again. Always have to change the receiver, another throwaway part because of the dryer sealed up on the inside.

A necessary requirement for working on these things was to get a much larger trashcan, maybe even a dumpster. The way things are going, would simply have to pitch the entire vehicle. Even if you are only having a small problem.

mk378 on Sat October 15, 2011 10:54 AM User is offline

First you need to find someone who knows what he's doing, perhaps that will end up being yourself. I don't understand what's so complicated about weighing out a commodity using a scale. How do they know how much money to charge you for refrigerant if they didn't weigh it?

This situation seems to have started with a leak, which since there's no mention of repairing it, it still leaks. You're just wasting time money and refrigerant not finding the leak first. It goes without saying here that you don't use "stop leak" preparations, they almost never work and have grave side-effects.

Proper diagnosis requires weighing in a full charge first. A blockage in the TXV or evaporator would cause abnormally low low-side pressure. Is the compressor engaging? It can take a long time (hours) for pressures to fully equalize in a TXV system after the compressor stops.

Edited: Sat October 15, 2011 at 11:02 AM by mk378

kapilamuni on Sun October 16, 2011 10:35 AM User is offline

Here they charge Rs 5000 to Rs 8000 (50 to 80 USD) just to vaccum & re-gas. Need to pay for other parts , if used. A top-up will cost around 20-25 USD.
Compressor starts but never stops, until I sw off the AC. The mechanic suggests to replace the TXV and Low side valve saying it's leaking.
Can I get high pressures in low side if it's the TXV?

thnaks & regds

Edited: Sun October 16, 2011 at 10:36 AM by kapilamuni

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