Ice cold air for 5 mins then warm air. Had system evacuated and recharged. All looked o.k.. Replaced a/c clutch relay. Checked and cleaned condenser fins. When a/c turns warm, checked engine compartment and found both low side and high side lines are hot . Both fans are running.When I unplugged the high side switch, the compressor stopped and the fans started running super fast. Temp gauge on dash shows normal as always.I turn off a/c and try it again later. It again comes on for a few minutes and is very cold and then turns warn again. I am guessing it may be the pressure switch located inline on right side of engine compartment. Should be no continueiy between 1 and 4 if disconnected while air is running and higher than 28 psi and lower than 455 I have an ohm meter and will try to figure out how to test this. If I have to replace this switch, does the whole system have to be evacuated again?.
Last edited by 95GT; 09-07-2009 at 02:03 AM.
Reason: Some info incorrect.
I did take the low side reading with a cheap gauge and my low side is perfect. According to this chart below, it would be the condenser or drier. I need to go to an a/c shop or buy a good set of gauges.
INTERPRETATION OF GAUGE READINGS
Below find a list of possible gauge readings and what they mean.
High low side and low high side readings. Your compressor is bad. The closer together the readings are, the less efficient the compressor is.
Low side into vacuum, high side normal. Expansion valve stuck in closed position, clogged with debris or restriction in the liquid line.
High low side, normal high side. Expansion valve stuck open. Hot water valve (heater control valve) trickling hot water into heater core causing AC plenum to get warm. Open seam on evaporator case drawing hot air from engine compartment. Bad condenser fan. Bad fan clutch. Too much oil in system. Possible overcharge and what appears to be a normal high side is actually too high.
High low side, high high side. Overcharge. Dirty condenser fins. Problems with cooling system, condenser fan(s), or radiator fan clutch. Restriction in condenser. Clogged drier.
Normal low side, high high side. Restriction in condenser. Overcharge. Clogged drier.
O.K. I shot a hose at condenser for 5 mins. and tube stayed warm and no cool air. Hmm I've read everything I can get my eyes on here and at celicatech, etc. and its all pushing me towards the condenser like you said fredk, or the low side switch, but my car has a combo type switch with 4 wires so jumping it is not an option. Definitely no wires on drier can. I am learning. Its a little harder for us girls. But I will keep trying. Any ideas will be welcome. Thanks!
i still say it sounds like an expansion valve/orifice tube because the purpose of it is to convert the high pressure into the low pressure. and its probably cheaper then a condensor. any possibility of it bein over charged?
Well, I took it to a garage and had it evap. and recharged but it was not an a/c shop. Possible that the machine operator was not as up on his a/c stuff as he needed to be.
find where the lines go into the firewall and the small one should be warm to cool with water on the condenser and the big one should be ice cold, if the small one is cool or cold follow it and somewhere along it you will feel it hot then get cold, thats where the blockage is, be sure the dryer is warm too, ya really need to get a gage set on it and tell me the readings at different times
i still say it sounds like an expansion valve/orifice tube because the purpose of it is to convert the high pressure into the low pressure. and its probably cheaper then a condensor. any possibility of it bein over charged?
I have to agree with this, the purpose of this valve/orifice tube is to regulate, I've learned so much doing research on AC, and people who have the similar issue have resloved it by replacing the valve/tube.
Don't konw where this is on a celica, i have a corolla.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
ToyotaNation.com is an independent Toyota/Lexus enthusiast website. ToyotaNation.com is not sponsored by or in any way affiliated with Toyota Motor Sales, USA, Inc. The Toyota, Lexus and Scion names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.
Forum for all Toyota Celica discussion! Including the ST16x/18x/20x, and ZZT230/231.
Linear Mode
